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Full-Text Articles in Engineering

High-Performance Graphene-Fiber-Based Neural Recording Microelectrodes, Kezhong Wang, Christopher Frewin, Dorna Esrafilzadeh, Changchun Yu, Caiyun Wang, Joseph Pancrazio, Mario I. Romero-Ortega, Rouhollah Jalili, Gordon G. Wallace Jan 2019

High-Performance Graphene-Fiber-Based Neural Recording Microelectrodes, Kezhong Wang, Christopher Frewin, Dorna Esrafilzadeh, Changchun Yu, Caiyun Wang, Joseph Pancrazio, Mario I. Romero-Ortega, Rouhollah Jalili, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Fabrication of flexible and free-standing graphene-fiber- (GF-) based microelectrode arrays with a thin platinum coating, acting as a current collector, results in a structure with low impedance, high surface area, and excellent electrochemical properties. This modification results in a strong synergistic effect between these two constituents leading to a robust and superior hybrid material with better performance than either graphene electrodes or Pt electrodes. The low impedance and porous structure of the GF results in an unrivalled charge injection capacity of 10.34 mC cm −2 with the ability to record and detect neuronal activity. Furthermore, the thin Pt layer ...


Critical Advances In Ambient Air Operation Of Nonaqueous Rechargeable Li-Air Batteries, Lili Liu, Haipeng Guo, Lijun Fu, Shulei Chou, Simon Thiele, Yu-Ping Wu, Jiazhao Wang Jan 2019

Critical Advances In Ambient Air Operation Of Nonaqueous Rechargeable Li-Air Batteries, Lili Liu, Haipeng Guo, Lijun Fu, Shulei Chou, Simon Thiele, Yu-Ping Wu, Jiazhao Wang

Australian Institute for Innovative Materials - Papers

Over the past few years, great attention has been given to nonaqueous lithium–air batteries owing to their ultrahigh theoretical energy density when compared with other energy storage systems. Most of the research interest, however, is dedicated to batteries operating in pure or dry oxygen atmospheres, while Li–air batteries that operate in ambient air still face big challenges. The biggest challenges are H2O and CO2 that exist in ambient air, which can not only form byproducts with discharge products (Li2O2), but also react with the electrolyte and the Li anode. To this end, recent progress in understanding the chemical ...


Body Heat Powers Future Electronic Skins, Ruoming Tian, Yuqing Liu, Kunihito Koumoto, Jun Chen Jan 2019

Body Heat Powers Future Electronic Skins, Ruoming Tian, Yuqing Liu, Kunihito Koumoto, Jun Chen

Australian Institute for Innovative Materials - Papers

© 2019 Elsevier Inc. Ruoming Tian recently joined the Mark Wainwright Analytical Centre as an XRD research assistant at the University of New South Wales. She was formerly a Research Scientist at the Toyota Physical and Chemical Research Institute in Japan (2015–2018) and received her PhD from the University of New South Wales in 2014. Her research interests focus on the nano- and micro-materials, flexible hybrid materials, and smart devices for harvesting both high- and low-grade thermal energy. She has published 2 book chapters and 18 peer-reviewed articles and delivered more than 15 talks at international conferences and leading research ...


New Monatomic Layer Clusters For Advanced Catalysis Materials, Binwei Zhang, Long Ren, Yunxiao Wang, Yi Du, Lei Jiang, Shi Xue Dou Jan 2019

New Monatomic Layer Clusters For Advanced Catalysis Materials, Binwei Zhang, Long Ren, Yunxiao Wang, Yi Du, Lei Jiang, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

Noble metals have been widely applied as catalysts in chemical production, energy conversion, and emission control [1-3], but their high cost and scarcity are major obstacles for any large-scale practical applications. It is therefore of great interest to explore new active material systems that require less mass loading of noble metal catalysts but with even better performance. Recently, intense research has been devoted towards downsizing the noble metals into single-atom catalysts (SACs) [4,5]. SACs, with single-atom active centers, were first reported by Qiao et al. [4]. They synthesized a single Pt atom catalyst supported on FeOx (Pt1/FeOx), which ...


Heteroatom-Doped Mose2 Nanosheets With Enhanced Hydrogen Evolution Kinetics For Alkaline Water Splitting, Guoqiang Zhao, Xingyong Wang, Shaolan Wang, Kun Rui, Yaping Chen, Haibo Yu, Jing Ma, Shi Xue Dou, Wenping Sun Jan 2019

Heteroatom-Doped Mose2 Nanosheets With Enhanced Hydrogen Evolution Kinetics For Alkaline Water Splitting, Guoqiang Zhao, Xingyong Wang, Shaolan Wang, Kun Rui, Yaping Chen, Haibo Yu, Jing Ma, Shi Xue Dou, Wenping Sun

Australian Institute for Innovative Materials - Papers

Electrochemical water splitting for hydrogen generation is a vital part for the prospect of future energy systems, however, the practical utilization relies on the development of highly active and earth-abundant catalysts to boost the energy conversion efficiency as well as reduce the cost. Molybdenum diselenide (MoSe2) is a promising nonprecious metal-based electrocatalyst for hydrogen evolution reaction (HER) in acidic media, but it exhibits inferior alkaline HER kinetics in great part due to the sluggish water adsorption/dissociation process. Herein, the alkaline HER kinetics of MoSe2 is substantially accelerated by heteroatom doping with transition metal ions. Specifically, the Ni-doped MoSe2 nanosheets ...


Long-Life Room-Temperature Sodium-Sulfur Batteries By Virtue Of Transition-Metal-Nanocluster-Sulfur Interactions, Binwei Zhang, Tian Sheng, Yunxiao Wang, Shulei Chou, Kenneth Davey, Shi Xue Dou, Shizhang Qiao Jan 2019

Long-Life Room-Temperature Sodium-Sulfur Batteries By Virtue Of Transition-Metal-Nanocluster-Sulfur Interactions, Binwei Zhang, Tian Sheng, Yunxiao Wang, Shulei Chou, Kenneth Davey, Shi Xue Dou, Shizhang Qiao

Australian Institute for Innovative Materials - Papers

Room‐temperature sodium–sulfur (RT‐Na/S) batteries hold significant promise for large‐scale application because of low cost of both sodium and sulfur. However, the dissolution of polysulfides into the electrolyte limits practical application. Now, the design and testing of a new class of sulfur hosts as transition‐metal (Fe, Cu, and Ni) nanoclusters (ca. 1.2 nm) wreathed on hollow carbon nanospheres (S@M‐HC) for RT‐Na/S batteries is reported. A chemical couple between the metal nanoclusters and sulfur is hypothesized to assist in immobilization of sulfur and to enhance conductivity and activity. S@Fe‐HC ...


Manganese Based Layered Oxides With Modulated Electronic And Thermodynamic Properties For Sodium Ion Batteries, Kai Zhang, Duho Kim, Zhe Hu, Mihui Park, Gahee Noh, Yujeong Yang, Jing Zhang, Vincent Lau, Shulei Chou, Maenghyo Cho, Si-Young Choi, Yong-Mook Kang Jan 2019

Manganese Based Layered Oxides With Modulated Electronic And Thermodynamic Properties For Sodium Ion Batteries, Kai Zhang, Duho Kim, Zhe Hu, Mihui Park, Gahee Noh, Yujeong Yang, Jing Zhang, Vincent Lau, Shulei Chou, Maenghyo Cho, Si-Young Choi, Yong-Mook Kang

Australian Institute for Innovative Materials - Papers

Manganese based layered oxides have received increasing attention as cathode materials for sodium ion batteries due to their high theoretical capacities and good sodium ion conductivities. However, the Jahn–Teller distortion arising from the manganese (III) centers destabilizes the host structure and deteriorates the cycling life. Herein, we report that zinc-doped Na0.833[Li0.25Mn0.75]O2 can not only suppress the Jahn–Teller effect but also reduce the inherent phase separations. The reduction of manganese (III) amount in the zinc-doped sample, as predicted by first-principles calculations, has been confirmed by its high binding energies ...


Recent Advances In 3d Graphene Architectures And Their Composites For Energy Storage Applications, Zhijie Wang, Hong Gao, Qing Zhang, Yuqing Liu, Jun Chen, Zaiping Guo Jan 2019

Recent Advances In 3d Graphene Architectures And Their Composites For Energy Storage Applications, Zhijie Wang, Hong Gao, Qing Zhang, Yuqing Liu, Jun Chen, Zaiping Guo

Australian Institute for Innovative Materials - Papers

Graphene is widely applied as an electrode material in energy storage fields. However, the strong π-π interaction between graphene layers and the stacking issues lead to a great loss of electrochemically active surface area, damaging the performance of graphene electrodes. Developing 3D graphene architectures that are constructed of graphene sheet subunits is an effective strategy to solve this problem. The graphene architectures can be directly utilized as binder-free electrodes for energy storage devices. Furthermore, they can be used as a matrix to support active materials and further improve their electrochemical performance. Here, recent advances in synthesizing 3D graphene architectures and ...


A Simple Technique For Development Of Fibres With Programmable Microsphere Concentration Gradients For Local Protein Delivery, Fahimeh Mehrpouya, Zhilian Yue, Anthony C. Romeo, Robert A. Gorkin Iii, Robert M. I Kapsa, Simon E. Moulton, Gordon G. Wallace Jan 2019

A Simple Technique For Development Of Fibres With Programmable Microsphere Concentration Gradients For Local Protein Delivery, Fahimeh Mehrpouya, Zhilian Yue, Anthony C. Romeo, Robert A. Gorkin Iii, Robert M. I Kapsa, Simon E. Moulton, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Alginate has been a biologically viable option for controlled local delivery of bioactive molecules in vitro and in vivo. Specific bioactive molecule release profiles are achieved often by controlling polymer composition/concentration, which also determines the modulus of hydrogels. This largely limits alginate-mediated bioactive molecule delivery to single-factors of uniform concentration applications, rather than applications that may require (multiple) bioactive molecules delivered at a concentration gradient for chemotactic purposes. Here we report a two-phase PLGA/alginate delivery system composed of protein-laden poly-d,l-lactic-co-glycolic acid (PLGA) microspheres wet-spun into alginate fibres. Fluorescein isothiocyanate-conjugated bovine serum albumin (FITC-BSA) was used as a ...


Ordered Platinum-Bismuth Intermetallic Clusters With Pt-Skin For A Highly Efficient Electrochemical Ethanol Oxidation Reaction, Binwei Zhang, Weihong Lai, Tian Sheng, Xi-Ming Qu, Yunxiao Wang, Long Ren, Lei Zhang, Yi Du, Yan-Xia Jiang, Shi-Gang Sun, Shi Xue Dou Jan 2019

Ordered Platinum-Bismuth Intermetallic Clusters With Pt-Skin For A Highly Efficient Electrochemical Ethanol Oxidation Reaction, Binwei Zhang, Weihong Lai, Tian Sheng, Xi-Ming Qu, Yunxiao Wang, Long Ren, Lei Zhang, Yi Du, Yan-Xia Jiang, Shi-Gang Sun, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

The ethanol oxidation reaction is extensively explored, but electrocatalysts that could achieve a complete oxidation pathway to CO 2 /CO 32- are much less reported. Here, we synthesize a monatomic Pt layer (Pt-skin) on ordered intermetallic PtBi clusters (PtBi@Pt) supported on graphene via a single atom self-assembling (SAS) method to form a superior catalyst. The PtBi@Pt with an ultrafine size (∼2 nm) delivers an extremely high mass activity of 9.01 mA μg Pt-1 , which is 8-fold more active than the commercial Pt/C; significantly, in situ Fourier transform infrared spectroscopy indicates that ethanol is completely oxidized to ...


Oxygen Vacancies Promoting The Electrocatalytic Performance Of Ceo 2 Nanorods As Cathode Materials For Li-O 2 Batteries, Yue Hou, Jun Wang, Chuanxin Hou, Yuqi Fan, Yanjie Zhai, Hongyu Li, Feng Dang, Shulei Chou Jan 2019

Oxygen Vacancies Promoting The Electrocatalytic Performance Of Ceo 2 Nanorods As Cathode Materials For Li-O 2 Batteries, Yue Hou, Jun Wang, Chuanxin Hou, Yuqi Fan, Yanjie Zhai, Hongyu Li, Feng Dang, Shulei Chou

Australian Institute for Innovative Materials - Papers

Li-O 2 batteries have become very promising power sources for electronic vehicles as a result of their extraordinary energy density. Nevertheless, the unfavourable electrocatalytic activity of cathode materials in Li-O 2 batteries is still a limiting factor for the practical application of Li-O 2 batteries. This study proposes a surface engineering strategy which can enhance the electrocatalytic activity of CeO 2 nanorods by tuning the oxygen vacancies on their surface, and found that the highest concentration of oxygen vacancies induces the best electrochemical performance, including an extended electrochemical stability of 200 cycles, and reduces the overpotential of the ORR from ...


Effect Of Monophasic Pulsed Stimulation On Live Single Cell De-Adhesion On Conducting Polymers With Adsorbed Fibronectin As Revealed By Single Cell Force Spectroscopy, Hongrui Zhang, Gordon G. Wallace, Michael J. Higgins Jan 2019

Effect Of Monophasic Pulsed Stimulation On Live Single Cell De-Adhesion On Conducting Polymers With Adsorbed Fibronectin As Revealed By Single Cell Force Spectroscopy, Hongrui Zhang, Gordon G. Wallace, Michael J. Higgins

Australian Institute for Innovative Materials - Papers

The force required to detach a single fibroblast cell in contact with the conducting polymer, polypyrrole doped with dodecylbenzene, was quantified using the Atomic Force Microscope-based technique, Single Cell Force Spectroscopy. The de-adhesion force for a single cell was 0.64 ± 0.03 nN and predominately due to unbinding of α5β1 integrin complexes with surface adsorbed fibronectin, as confirmed by blocking experiments using antibodies. Monophasic pulsed stimulation (50 μs pulse duration) superimposed on either an applied oxidation (+500) or reduction (−500 mV) constant voltage caused a significant decrease in the de-adhesion force by 30%-45% to values ranging from 0 ...


Enhancing Oxygen Evolution Efficiency Of Multiferroic Oxides By Spintronic And Ferroelectric Polarization Regulation, Xiaoning Li, Huan Liu, Zezhi Chen, Qingmei Wu, Zheyin Yu, Mengmeng Yang, Xiaolin Wang, Zhenxiang Cheng, Zhengping Fu, Yalin Lu Jan 2019

Enhancing Oxygen Evolution Efficiency Of Multiferroic Oxides By Spintronic And Ferroelectric Polarization Regulation, Xiaoning Li, Huan Liu, Zezhi Chen, Qingmei Wu, Zheyin Yu, Mengmeng Yang, Xiaolin Wang, Zhenxiang Cheng, Zhengping Fu, Yalin Lu

Australian Institute for Innovative Materials - Papers

Regulating the electronic structure of catalysts is the most efficient strategy yet, despite its limitations, to improve their oxygen evolution efficiency. Instead of only adjusting the electronic structure, here we utilize ferroelectric polarization to accelerate the oxygen evolution reaction as well. This is demonstrated on a multiferroic layered perovskite Bi 5 CoTi 3 O 15 with in-situ grown BiCoO 3 . Thanks to the superimposed effects of electronic regulation and ferroelectric polarization, the as-prepared multiferroic electrocatalysts are more efficient than the benchmark IrO 2 (with a final 320 mV overpotential at the current density of 10 mA cm −2 and a ...


Electronic Structure Engineering Of Licoo2 Toward Enhanced Oxygen Electrocatalysis, Xiaobo Zheng, Yaping Chen, Xusheng Zheng, Guoqiang Zhao, Kun Rui, Peng Li, Xun Xu, Zhenxiang Cheng, Shi Xue Dou, Wenping Sun Jan 2019

Electronic Structure Engineering Of Licoo2 Toward Enhanced Oxygen Electrocatalysis, Xiaobo Zheng, Yaping Chen, Xusheng Zheng, Guoqiang Zhao, Kun Rui, Peng Li, Xun Xu, Zhenxiang Cheng, Shi Xue Dou, Wenping Sun

Australian Institute for Innovative Materials - Papers

Developing low-cost and efficient electrocatalysts for the oxygen evolution reaction and oxygen reduction reaction is of critical significance to the practical application of some emerging energy storage and conversion devices (e.g., metal-air batteries, water electrolyzers, and fuel cells). Lithium cobalt oxide is a promising nonprecious metal-based electrocatalyst for oxygen electrocatalysis; its activity, however, is still far from the requirements of practical applications. Here, a new LiCoO 2 -based electrocatalyst with nanosheet morphology is developed by a combination of Mg doping and shear force-assisted exfoliation strategies toward enhanced oxygen reduction and evolution reaction kinetics. It is demonstrated that the coupling ...


Size Effects On The Mechanical Properties Of Nanoporous Graphene Networks, Dai-Ming Tang, Cui Ren, Ling Zhang, Ying Tao, Peng Zhang, Wei Lv, Xiang Jia, Xiaojuan Jiang, Guangmin Zhou, Takahito Ohmura, Ping Huai, Feng Li, Yoshio Bando, Dmitri Golberg, Quan-Hong Yang Jan 2019

Size Effects On The Mechanical Properties Of Nanoporous Graphene Networks, Dai-Ming Tang, Cui Ren, Ling Zhang, Ying Tao, Peng Zhang, Wei Lv, Xiang Jia, Xiaojuan Jiang, Guangmin Zhou, Takahito Ohmura, Ping Huai, Feng Li, Yoshio Bando, Dmitri Golberg, Quan-Hong Yang

Australian Institute for Innovative Materials - Papers

It is essential to understand the size scaling effects on the mechanical properties of graphene networks to realize the potential mechanical applications of graphene assemblies. Here, a "highly dense-yet-nanoporous graphene monolith (HPGM)" is used as a model material of graphene networks to investigate the dependence of mechanical properties on the intrinsic interplanar interactions and the extrinsic specimen size effects. The interactions between graphene sheets could be enhanced by heat treatment and the plastic HPGM is transformed into a highly elastic network. A strong size effect is revealed by in situ compression of micro- and nanopillars inside electron microscopes. Both the ...


Manipulation Of The Electronic Transport Properties Of Charge-Transfer Oxide Thin Films Of Ndni O3 Using Static And Electric-Field-Controllable Dynamic Lattice Strain, Jian-Min Yan, Meng Xu, Ting-Wei Chen, Ming Yang, Fei Liu, Hui Wang, Lei Guo, Zhi-Xue Xu, Fang-Yuan Fan, Guan-Yin Gao, Si-Ning Dong, Xiao-Guang Li, Hao Luo, Weiyao Zhao, Ren-Kui Zheng Jan 2019

Manipulation Of The Electronic Transport Properties Of Charge-Transfer Oxide Thin Films Of Ndni O3 Using Static And Electric-Field-Controllable Dynamic Lattice Strain, Jian-Min Yan, Meng Xu, Ting-Wei Chen, Ming Yang, Fei Liu, Hui Wang, Lei Guo, Zhi-Xue Xu, Fang-Yuan Fan, Guan-Yin Gao, Si-Ning Dong, Xiao-Guang Li, Hao Luo, Weiyao Zhao, Ren-Kui Zheng

Australian Institute for Innovative Materials - Papers

Using perovskite-type charge-transfer oxide thin films of NdNiO3 (NNO) as a model system, we demonstrate that the effects of lattice strain on the electronic transport properties can be more comprehensively understood by growing NNO films on a number of (001)-, (011)-, and (111)-cut single-crystal substrates with different lattice mismatches including the relaxor-based 0.31Pb(In1/2Nb1/2)O3-0.35Pb(Mg1/3Nb2/3)O3-0.34PbTiO3 (PIN-PMN-PT) and 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-PT) ferroelectric (FE) single crystals. In addition to the static lattice strains from conventional substrates (e.g., SrTiO3, LaAlO3), we in situ impose in-plane compressive or ...


Yolk-Shell Structured Fep@C Nanoboxes As Advanced Anode Materials For Rechargeable Lithium-/Potassium-Ion Batteries, Fuhua Yang, Hong Gao, Junnan Hao, Shilin Zhang, Peng Li, Yuqing Liu, Jun Chen, Zaiping Guo Jan 2019

Yolk-Shell Structured Fep@C Nanoboxes As Advanced Anode Materials For Rechargeable Lithium-/Potassium-Ion Batteries, Fuhua Yang, Hong Gao, Junnan Hao, Shilin Zhang, Peng Li, Yuqing Liu, Jun Chen, Zaiping Guo

Australian Institute for Innovative Materials - Papers

Maintaining structural stability and alleviating the intrinsic poor conductivity of conversion-type reaction anode materials are of great importance for practical application. Introducing void space and a highly conductive host to accommodate the volume changes and enhance the conductivity would be a smart design to achieve robust construction; effective electron and ion transportation, thus, lead to prolonged cycling life and excellent rate performance. Herein, uniform yolk-shell FeP@C nanoboxes (FeP@CNBs) with the inner FeP nanoparticles completely protected by a thin and self-supported carbon shell are synthesized through a phosphidation process with yolk-shell Fe 2 O 3 @CNBs as a precursor ...


Approaching High-Performance Potassium-Ion Batteries Via Advanced Design Strategies And Engineering, Wenchao Zhang, Yajie Liu, Zaiping Guo Jan 2019

Approaching High-Performance Potassium-Ion Batteries Via Advanced Design Strategies And Engineering, Wenchao Zhang, Yajie Liu, Zaiping Guo

Australian Institute for Innovative Materials - Papers

Potassium-ion batteries (PIBs) have attracted tremendous attention due to their low cost, fast ionic conductivity in electrolyte, and high operating voltage. Research on PIBs is still in its infancy, however, and achieving a general understanding of the drawbacks of each component and proposing research strategies for overcoming these problems are crucial for the exploration of suitable electrode materials/electrolytes and the establishment of electrode/ cell assembly technologies for further development of PIBs. In this review, we summarize our current understanding in this field, classify and highlight the design strategies for addressing the key issues in the research on PIBs, and ...


Competition Between Cubic And Tetragonal Phasesin All-D-Metal Heusler Alloys, X2-Xmn1+Xv (X= Pd, Ni, Pt, Ag, Au, Ir, Co; X= 1, 0): A New Potential Direction Of The Heusler Family, Yilin Han, Mengxin Wu, Yu Feng, Zhenxiang Cheng, Tingting Lin, Tie Yang, Rabah Khenata, Xiaotian Wang Jan 2019

Competition Between Cubic And Tetragonal Phasesin All-D-Metal Heusler Alloys, X2-Xmn1+Xv (X= Pd, Ni, Pt, Ag, Au, Ir, Co; X= 1, 0): A New Potential Direction Of The Heusler Family, Yilin Han, Mengxin Wu, Yu Feng, Zhenxiang Cheng, Tingting Lin, Tie Yang, Rabah Khenata, Xiaotian Wang

Australian Institute for Innovative Materials - Papers

In this work, a series of all-d-metal Heusler alloys, X 2 - x Mn 1 + x V (X = Pd, Ni, Pt, Ag, Au, Ir, Co; x; = 1, 0), were predicted by first principles. The series can be roughly divided into two categories: XMn 2 V (Mn-rich type) and X 2 MnV (Mn-poor type). Using optimized structural analysis, it is shown that the ground state of these all-d-metal Heusler alloys does not fully meet the site-preference rule for classic full-Heusler alloys. All the Mn-rich type alloys tend to form the L2 1 structure, where the two Mn atoms prefer to occupy the ...


Biomimetic Thermal-Sensitive Multi-Transform Actuator, Tae Hyeob Kim, Jung Gi Choi, Ju Young Byun, Yongwoo Jang, Sung Min Kim, Geoffrey M. Spinks, Seon Jeong Kim Jan 2019

Biomimetic Thermal-Sensitive Multi-Transform Actuator, Tae Hyeob Kim, Jung Gi Choi, Ju Young Byun, Yongwoo Jang, Sung Min Kim, Geoffrey M. Spinks, Seon Jeong Kim

Australian Institute for Innovative Materials - Papers

Controllable and miniaturised mechanical actuation is one of the main challenges facing various emerging technologies, such as soft robotics, drug delivery systems, and microfluidics. Here we introduce a simple method for constructing actuating devices with programmable complex motions. Thermally responsive hydrogels based on poly(N-isopropylacrylamide) (PNIPAM) and its functionalized derivatives (f-PNIPAM) were used to control the lower critical solution temperature (LCST) or the temperature at which the gel volume changes. Techniques for ultra-violet crosslinking the monomer solutions were developed to generate gel sheets with controllable crosslink density gradients that allowed bending actuation to specified curvatures by heating through the LCST ...


Intercalation Pseudocapacitance Boosting Ultrafast Sodium Storage In Prussian Blue Analogs, Baoqi Wang, Shuangyu Liu, Wenping Sun, Yuxin Tang, Hongge Pan, Mi Yan, Yinzhu Jiang Jan 2019

Intercalation Pseudocapacitance Boosting Ultrafast Sodium Storage In Prussian Blue Analogs, Baoqi Wang, Shuangyu Liu, Wenping Sun, Yuxin Tang, Hongge Pan, Mi Yan, Yinzhu Jiang

Australian Institute for Innovative Materials - Papers

Great expectation is placed on sodium-ion batteries with high rate capability to satisfy multiple requirements in large-scale energy storage systems. However, the large ionic radius and high mass of Na + hamper its kinetics in the case of diffusion-controlled mechanisms in conventional electrodes. In this study, a unique intercalation pseudocapacitance has been demonstrated in low-vacancy copper hexacyanoferrate, achieving outstanding rate capability. The minimization of the [Fe(CN) 6 ] vacancy enables unhindered diffusion pathways for Na + and little structural change during the Fe 2+ /Fe 3+ redox reaction, eliminating solid-state diffusion limits. Moreover, the Cu + /Cu 2+ couple is unexpectedly activated, realizing ...


Rational Design Of Two-Dimensional Hybrid Co/N-Doped Carbon Nanosheet Arrays For Efficient Bi-Functional Electrocatalysis, Ningyan Cheng, Long Ren, Gilberto Casillas, Si Zhou, Jincheng Zhuang, Li Wang, Xun Xu, Shi Xue Dou, Yi Du Jan 2019

Rational Design Of Two-Dimensional Hybrid Co/N-Doped Carbon Nanosheet Arrays For Efficient Bi-Functional Electrocatalysis, Ningyan Cheng, Long Ren, Gilberto Casillas, Si Zhou, Jincheng Zhuang, Li Wang, Xun Xu, Shi Xue Dou, Yi Du

Australian Institute for Innovative Materials - Papers

Transition metals with desirable valence states have been proposed as efficient non-noble-metal electrocatalytic systems for selective water splitting. In this work, two-dimensional (2D) nitrogen-doped leaf-like carbon matrix arrays functionalized with multi-valence-state transition metal (cobalt) hybrids were successfully prepared by in situ calcination of the corresponding bimetallic leaf-like zeolitic imidazolate framework (ZIF-L) in an inert atmosphere. The 2D morphology of the matrix along with the particle size and surface valence state of the anchored particles has been successfully controlled via precisely adjusting the Co2+/(Zn2+ + Co2+) ratio in the bimetallic ZIF-L precursor. Electrochemical measurements show that the kinetics of and stability ...


Strategies For Neural Control Of Prosthetic Limbs: From Electrode Interfacing To 3d Printing, Catherine G.Y. Ngan, Robert M. I Kapsa, Peter Choong Jan 2019

Strategies For Neural Control Of Prosthetic Limbs: From Electrode Interfacing To 3d Printing, Catherine G.Y. Ngan, Robert M. I Kapsa, Peter Choong

Australian Institute for Innovative Materials - Papers

Limb amputation is a major cause of disability in our community, for which motorised prosthetic devices offer a return to function and independence. With the commercialisation and increasing availability of advanced motorised prosthetic technologies, there is a consumer need and clinical drive for intuitive user control. In this context, rapid additive fabrication/prototyping capacities and biofabrication protocols embrace a highly-personalised medicine doctrine that marries specific patient biology and anatomy to high-end prosthetic design, manufacture and functionality. Commercially-available prosthetic models utilise surface electrodes that are limited by their disconnect between mind and device. As such, alternative strategies of mind-prosthetic interfacing have ...


Insights Into The Electron Transfer Kinetics, Capacitance And Resistance Effects Of Implantable Electrodes Using Fourier Transform Ac Voltammetry On Platinum, Alexander R. Harris, Carrie Newbold, Robert Cowan, Gordon G. Wallace Jan 2019

Insights Into The Electron Transfer Kinetics, Capacitance And Resistance Effects Of Implantable Electrodes Using Fourier Transform Ac Voltammetry On Platinum, Alexander R. Harris, Carrie Newbold, Robert Cowan, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

The charge transfer mechanism at the electrode-solution interface was assessed by Fourier transform AC voltammetry (FTACV). The faradaic reactions that occur within the safe potential window on platinum had slow electron transfer kinetics. The charge transfer mechanisms during short chronopotentiometric stimulation of cells, is most likely dominated by capacitance. Impedance was modelled with a single time constant. FTACV was fit with a 2-component equivalent circuit comprising a series capacitor and resistor. Capacitance and resistance varied with electrode potential, area, topography, surface functionality and solution composition. Capacitance correlated with charge storage capacity measured by voltammetry. Increased capacitance reduced the change in ...


Bio‑Derived Hierarchical Multicore-Shell Fe2n‑Nanoparticle‑Impregnated N‑Doped Carbon Nanofiber Bundles: A Host Material For Lithium‑/Potassium‑Ion Storage, Hongjun Jiang, Ling Huang, Yunhong Wei, Boya Wang, Hao Wu, Yun Zhang, Hua-Kun Liu, Shi Xue Dou Jan 2019

Bio‑Derived Hierarchical Multicore-Shell Fe2n‑Nanoparticle‑Impregnated N‑Doped Carbon Nanofiber Bundles: A Host Material For Lithium‑/Potassium‑Ion Storage, Hongjun Jiang, Ling Huang, Yunhong Wei, Boya Wang, Hao Wu, Yun Zhang, Hua-Kun Liu, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

Despite the significant progress in the fabrication of advanced electrode materials, complex control strategies and tedious processing are often involved for most targeted materials to tailor their compositions, morphologies, and chemistries. Inspired by the unique geometric structures of natural biomacromolecules together with their high affinities for metal species, we propose the use of skin collagen fibers for the template crafting of a novel multicore-shell Fe2N-carbon framework anode configuration, composed of hierarchical N-doped carbon nanofiber bundles firmly embedded with Fe2N nanoparticles (Fe2N@N-CFBs). In the resultant heterostructure, the Fe2N nanoparticles firmly confined inside the carbon shells are spatially isolated but electronically ...


Human Neural Tissues From Neural Stem Cells Using Conductive Biogel And Printed Polymer Microelectrode Arrays For 3d Electrical Stimulation, Eva Tomaskovic-Crook, Peikai Zhang, Annika Ahtiainen, Heidi Kaisvuo, Chong Yong Lee, Stephen T. Beirne, Zaid Aqrawe, Darren Svirskis, Jari A. Hyttinen, Gordon G. Wallace, Jadranka Travas-Sejdic, Jeremy Micah Crook Jan 2019

Human Neural Tissues From Neural Stem Cells Using Conductive Biogel And Printed Polymer Microelectrode Arrays For 3d Electrical Stimulation, Eva Tomaskovic-Crook, Peikai Zhang, Annika Ahtiainen, Heidi Kaisvuo, Chong Yong Lee, Stephen T. Beirne, Zaid Aqrawe, Darren Svirskis, Jari A. Hyttinen, Gordon G. Wallace, Jadranka Travas-Sejdic, Jeremy Micah Crook

Australian Institute for Innovative Materials - Papers

Electricity is important in the physiology and development of human tissues such as embryonic and fetal development, and tissue regeneration for wound healing. Accordingly, electrical stimulation (ES) is increasingly being applied to influence cell behavior and function for a biomimetic approach to in vitro cell culture and tissue engineering. Here, the application of conductive polymer (CP) poly(3,4-ethylenedioxythiophene)-polystyrenesulfonate (PEDOT:PSS) pillars is described, direct-write printed in an array format, for 3D ES of maturing neural tissues that are derived from human neural stem cells (NSCs). NSCs are initially encapsulated within a conductive polysaccharide-based biogel interfaced with the CP ...


Low-Coordinate Iridium Oxide Confined On Graphitic Carbon Nitride For Highly Efficient Oxygen Evolution, Jiayi Chen, Peixin Cui, Guoqiang Zhao, Kun Rui, Mengmeng Lao, Yaping Chen, Xusheng Zheng, Yinzhu Jiang, Hongge Pan, Shi Xue Dou, Wenping Sun Jan 2019

Low-Coordinate Iridium Oxide Confined On Graphitic Carbon Nitride For Highly Efficient Oxygen Evolution, Jiayi Chen, Peixin Cui, Guoqiang Zhao, Kun Rui, Mengmeng Lao, Yaping Chen, Xusheng Zheng, Yinzhu Jiang, Hongge Pan, Shi Xue Dou, Wenping Sun

Australian Institute for Innovative Materials - Papers

Highly active and durable electrocatalysts for the oxygen evolution reaction (OER) is greatly desired. Iridium oxide/graphitic carbon nitride (IrO2/GCN) heterostructures are designed with low-coordinate IrO2 nanoparticles (NPs) confined on superhydrophilic highly stable GCN nanosheets for efficient acidic OER. The GCN nanosheets not only ensure the homogeneous distribution and confinement of IrO2 NPs but also endows the heterostructured catalyst system with a superhydrophilic surface, which can maximize the exposure of active sites and promotes mass diffusion. The coordination number of Ir atoms is decreased owing to the strong interaction between IrO2 and GCN, leading to lattice strain and increment ...


Phase Evolution In Calcium Molybdate Nanoparticles As A Function Of Synthesis Temperature And Its Electrochemical Effect On Energy Storage, Manickam Minakshi, David R. G Mitchell, Christian Baur, Johann Chable, Anders Barlow, Maximilian Fichtner, Amitava Banerjee, Sudip Chakraborty, Rajeev Ahuja Jan 2019

Phase Evolution In Calcium Molybdate Nanoparticles As A Function Of Synthesis Temperature And Its Electrochemical Effect On Energy Storage, Manickam Minakshi, David R. G Mitchell, Christian Baur, Johann Chable, Anders Barlow, Maximilian Fichtner, Amitava Banerjee, Sudip Chakraborty, Rajeev Ahuja

Australian Institute for Innovative Materials - Papers

The design of a suitable electrode is an essential and fundamental research challenge in the field of electrochemical energy storage because the electronic structures and morphologies determine the surface redox reactions. Calcium molybdate (CaMoO4) was synthesized by a combustion route at 300 C and 500 C. We describe new findings on the behaviour of CaMoO4 and evaluate the influence of crystallinity on energy storage performance. A wide range of characterization techniques was used to obtain detailed information about the physical and morphological characteristics of CaMoO4. The characterization results enable the phase evolution as a function of the electrode synthesis temperature ...


Niobium-Titanium (Nb-Ti) Superconducting Joints For Persistent-Mode Operation, Dipakkumar Patel, Su Hun Kim, Wenbin Qiu, Minoru Maeda, Akiyoshi Matsumoto, Gen Nishijima, Hiroaki Kumakura, Seyong Choi, Jung Ho Kim Jan 2019

Niobium-Titanium (Nb-Ti) Superconducting Joints For Persistent-Mode Operation, Dipakkumar Patel, Su Hun Kim, Wenbin Qiu, Minoru Maeda, Akiyoshi Matsumoto, Gen Nishijima, Hiroaki Kumakura, Seyong Choi, Jung Ho Kim

Australian Institute for Innovative Materials - Papers

Superconducting joints are essential for persistent-mode operation in a superconducting magnet system to produce an ultra-stable magnetic field. Herein, we report rationally designed niobium-titanium (Nb-Ti) superconducting joints and their evaluation results in detail. For practical applications, superconducting joints were fabricated by using a solder matrix replacement method with two types of lead-bismuth (Pb-Bi) solder, including Pb42Bi58 as a new composition. All the joints attained a critical current of >200 A below 1.43 T at 4.2 K. Our optimized superconducting joining method was tested in a closed-loop coil, obtaining a total circuit resistance of 3.25 x 10-14 Ω ...


Design Strategies For Developing Non-Precious Metal Based Bi-Functional Catalysts For Alkaline Electrolyte Based Zinc-Air Batteries, Chao Han, Weijie Li, Hua-Kun Liu, Shi Xue Dou, Jiazhao Wang Jan 2019

Design Strategies For Developing Non-Precious Metal Based Bi-Functional Catalysts For Alkaline Electrolyte Based Zinc-Air Batteries, Chao Han, Weijie Li, Hua-Kun Liu, Shi Xue Dou, Jiazhao Wang

Australian Institute for Innovative Materials - Papers

Compared with the current dominant energy storage system (lithium-ion batteries (LIBs)), rechargeable zinc-air batteries (ZABs) with alkaline electrolyte are safer and less expensive, have much higher theoretical volumetric energy density, can be manufactured in ambient air rather than a dry room, and have much higher tolerance to moisture and air during operation. A mature aqueous alkaline electrolyte could also significantly improve safety while minimizing the fabrication cost. Hence, ZABs have great potential to challenge the dominant position of LIBs in the future. Nevertheless, the widespread application of this energy storage system is seriously hindered by the sluggish kinetics of the ...