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Full-Text Articles in Physical Sciences and Mathematics
Dynamic Magneto-Optical Imaging Of Superconducting Thin Films, Frederick Wells, Alexey V. Pan, Stephen Wilson, Igor Golovchanskiy, Sergey Fedoseev, Anatoly B. Rosenfeld
Dynamic Magneto-Optical Imaging Of Superconducting Thin Films, Frederick Wells, Alexey V. Pan, Stephen Wilson, Igor Golovchanskiy, Sergey Fedoseev, Anatoly B. Rosenfeld
Australian Institute for Innovative Materials - Papers
We present a novel method for analysis of superconducting thin films using dynamic magneto-optical imaging, revealing hallmarks of flux penetration with temporal resolution around 1 ms (in the present work) or better. This method involves investigation of transient field and dynamic current distributions, which are calculated by an inversion procedure on the Biot-Savart Law, which we show to be valid under dynamic conditions. We compare and discuss the flux front penetration speed and evolution of current distribution in high quality YBa2Cu3O${}_{7-\delta }$ thin films with that of samples deliberately damaged in such a way as to reduce critical current density …
Ambient Synthesis Of One-/Two-Dimensional Cuagse Ternary Nanotubes As Counter Electrodes Of Quantum-Dot-Sensitized Solar Cells, Xin Qi Chen, Yang Bai, Zhen Li, Lian Zhou Wang, S X. Dou
Ambient Synthesis Of One-/Two-Dimensional Cuagse Ternary Nanotubes As Counter Electrodes Of Quantum-Dot-Sensitized Solar Cells, Xin Qi Chen, Yang Bai, Zhen Li, Lian Zhou Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. One-/two-dimensional ternary CuAgSe nanotubes (NTs) were successfully prepared from copper selenide (Cu2-xSe) NTs at room temperature within a short reaction time by the facile cation-exchange approach. Cation exchange leads to the transformation of the crystal structure from cubic into orthorhombic and/or tetragonal with good retention of morphology. The exchange reactions are spontaneous owing to large negative changes of the Gibbs free energy. The effects of parameters such as reaction time, precursor source, and precursor ratio on the exchange reaction were investigated. The resultant CuAgSe NTs were explored as counter electrodes (CEs) of …
Ambient Synthesis Of A Multifunctional 1d/2d Hierarchical Ag-Ag2s Nanowire/Nanosheet Heterostructure With Diverse Applications, Jinyan Xiong, Chao Han, Weijie Li, Qiao Sun, Jun Chen, Shulei Chou, Zhen Li, S X. Dou
Ambient Synthesis Of A Multifunctional 1d/2d Hierarchical Ag-Ag2s Nanowire/Nanosheet Heterostructure With Diverse Applications, Jinyan Xiong, Chao Han, Weijie Li, Qiao Sun, Jun Chen, Shulei Chou, Zhen Li, S X. Dou
Australian Institute for Innovative Materials - Papers
A new type of unique 1D/2D hierarchical Ag-Ag2S heterostructures is fabricated by an extremely simple solution route under ambient conditions. The morphology, size, crystal structure and composition of the products were comprehensively investigated, and it was found that the reaction time and the amount of S powder play crucial roles in the formation of well-defined 1D/2D hierarchical Ag-Ag2S heterostructures. The diffusion and Ostwald ripening processes dominate the evolution of the heterostructure. The resultant 1D/2D Ag-Ag2S hybrids exhibit great potential in Li/Na ion battery anodes, SERS detection and decoloration towards organic dyes.
Silicon Monoxide-A Convenient Precursor For Large Scale Synthesis Of Near Infrared Emitting Monodisperse Silicon Nanocrystals, Wei Sun, Chenxi Qian, Xiao Sherri Cui, Liwei Wang, Muan Wei, Gilberto Casillas, Amr S. Helmy, Geoffrey A. Ozin
Silicon Monoxide-A Convenient Precursor For Large Scale Synthesis Of Near Infrared Emitting Monodisperse Silicon Nanocrystals, Wei Sun, Chenxi Qian, Xiao Sherri Cui, Liwei Wang, Muan Wei, Gilberto Casillas, Amr S. Helmy, Geoffrey A. Ozin
Australian Institute for Innovative Materials - Papers
While silicon nanocrystals (ncSi) embedded in silicon dioxide thin films have been intensively studied in physics, the potential of batch synthesis of silicon nanocrystals from the solid-state disproportionation of SiO powder has not drawn much attention in chemistry. Herein we describe some remarkable effects observed in the diffraction, microscopy and spectroscopy of SiO powder upon thermal processing in the temperature range 850-1100 °C. Quantum confinement effects and structural changes of the material related to the size of the silicon nanocrystals nucleated and grown in this way were established by Photoluminescence (PL), Raman, FTIR and UV-Visible spectroscopy, PXRD and STEM, pinpointing …
Significant Enhancement Of The Cycling Performance And Rate Capability Of The P/C Composite Via Chemical Bonding (P-C), Weijie Li, Shulei Chou, Jiazhao Wang, Hua-Kun Liu, S X. Dou
Significant Enhancement Of The Cycling Performance And Rate Capability Of The P/C Composite Via Chemical Bonding (P-C), Weijie Li, Shulei Chou, Jiazhao Wang, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
Among anode materials for sodium ion batteries, red phosphorus is a very promising one due to its abundant reserves, low-cost and high theoretical capacity of 2600 mA h g-1. However, its huge volume expansion on sodiation (∼490%) and poor conductivity leads to dramatic capacity decay, restraining its practical application. To improve the electrochemical performance, here, we prepared a red phosphorus and graphene nanoplate composite using cheap red P and natural graphite as the starting materials via a simple and scalable ball-milling method. The phosphorus-carbon bond formed during the milling process improves the electrical connectivity between P particles and graphene nanoplates, …
Controllable Synthesis Of Few-Layered And Hierarchically Porous Boron Nitride Nanosheets, Feng Xiao, Zhixin Chen, Gilberto Casillas, Christopher Richardson, Huijun Li, Zhenguo Huang
Controllable Synthesis Of Few-Layered And Hierarchically Porous Boron Nitride Nanosheets, Feng Xiao, Zhixin Chen, Gilberto Casillas, Christopher Richardson, Huijun Li, Zhenguo Huang
Australian Institute for Innovative Materials - Papers
Few-layered porous boron nitride nanosheets (BNNS) have been prepared using a dynamic magnesium diboride (MgB2) template and ammonium chloride (NH4Cl) etchant. Magnesium-based intermediates serve as layer separators in the synthesis and prevent extensive aggregation, resulting in few-layered BNNS. The resultant BNNS are hierarchically porous and show good CO2/N2 adsorption selectivity.
Intrinsically Core-Shell Plasmonic Dielectric Nanostructures With Ultrahigh Refractive Index, Zengji Yue, Boyuan Cai, Lan Wang, Xiaolin Wang, Min Gu
Intrinsically Core-Shell Plasmonic Dielectric Nanostructures With Ultrahigh Refractive Index, Zengji Yue, Boyuan Cai, Lan Wang, Xiaolin Wang, Min Gu
Australian Institute for Innovative Materials - Papers
Topological insulators are a new class of quantum material s with metallic (edge) surface states and insulating bulk states. They demonstrate a variety of novel electronic and optical properties, which make them highly promising electronic, spintronic, and optoelectronic materials. We report on a novel conic plasmonic nanostructure that is made of bulk-insulating topological insulators and has an intrinsic core-shell formation. The insulating (dielectric) core of the nanocone displays an ultrahigh refractive index of up to 5.5 in the near-infrared frequency range. On the metallic shell, plasmonic response and strong backward light scattering were observed in the visible frequency range. Through …
Toward Biodegradable Mg-Air Bioelectric Batteries Composed Of Silk Fibroin-Polypyrrole Film, Xiaoteng Jia, Caiyun Wang, Chen Zhao, Yu Ge, Gordon G. Wallace
Toward Biodegradable Mg-Air Bioelectric Batteries Composed Of Silk Fibroin-Polypyrrole Film, Xiaoteng Jia, Caiyun Wang, Chen Zhao, Yu Ge, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Biodegradable active implantable devices can be used to diagnose and/or treat disease and eventually disappear without surgical removal. If an "external" energy source is required for effective operation then a biocompatible and biodegradable battery would be ideal. In this study, a partially biodegradable Mg-air bioelectric battery (biobattery) is demonstrated using a silk fibroin-polypyrrole (SF-PPy) film cathode coupled with bioresorbable Mg alloy anode in phosphate buffered saline (PBS) electrolyte. PPy is chemically coated onto one side of the silk substrate. SF-PPy film shows a conductivity of ≈1.1 S cm−1 and a mild catalytic activity toward oxygen reduction. It degrades in a …
Substituted Ferrocenes And Iodine As Synergistic Thermoelectrochemical Heat Harvesting Redox Couples In Ionic Liquids, E H.B Anari, Mark S. Romano, W X. Teh, J J. Black, E Jiang, Jun Chen, T Q. To, J Panchompoo, Leigh Aldous
Substituted Ferrocenes And Iodine As Synergistic Thermoelectrochemical Heat Harvesting Redox Couples In Ionic Liquids, E H.B Anari, Mark S. Romano, W X. Teh, J J. Black, E Jiang, Jun Chen, T Q. To, J Panchompoo, Leigh Aldous
Australian Institute for Innovative Materials - Papers
2016 The Royal Society of Chemistry. Combining ferrocene and iodine results in enhanced thermoelectrochemical (or thermogalvanic) waste heat harvesting abilities, for both the Seebeck coefficient and the overall power output. All systems displayed a mixture of ferrocene, ferrocenium, iodine and triiodide. The observed enhancement correlates with lower electron-density on the ferrocene; the synergistic improvement observed for mixtures of substituted ferrocenes and iodine is attributed to the formation of charge-transfer complexes. Combining dibutanoylferrocene and iodine resulted in the highest Seebeck coefficient of 1.67 mV K-1.
Direct Measurements Of Field-Dependent Ordering In A Low-Field Vortex Glass State, Frederick Wells, Alexey V. Pan, X Renshaw Wang, Igor A. Golovchanskiy, Sergey Fedoseev, Hans Hilgenkamp, Anatoly B. Rosenfeld
Direct Measurements Of Field-Dependent Ordering In A Low-Field Vortex Glass State, Frederick Wells, Alexey V. Pan, X Renshaw Wang, Igor A. Golovchanskiy, Sergey Fedoseev, Hans Hilgenkamp, Anatoly B. Rosenfeld
Australian Institute for Innovative Materials - Papers
The variation of topological defect density and hexatic order parameter were measured over a range of micro-Tesla fields in a 2-D superconducting vortex glass. This was achieved through scanning SQUID microscopy of the vortex distribution in YBa2Cu3O7−δ thin films under field-cooled conditions. It was discovered that, although the defect density decreased for increasing magnetic fields, giving the impression of a more lattice-like vortex distribution, the hexatic order parameter also decreased, showing that the distribution was less orientationally ordered.
Indirect-Direct Band Transformation Of Few-Layer Biocl Under Biaxial Strain, Zhongfei Xu, Weichang Hao, Qianfan Zhang, Zhongheng Fu, Haifeng Feng, Yi Du, S X. Dou
Indirect-Direct Band Transformation Of Few-Layer Biocl Under Biaxial Strain, Zhongfei Xu, Weichang Hao, Qianfan Zhang, Zhongheng Fu, Haifeng Feng, Yi Du, S X. Dou
Australian Institute for Innovative Materials - Papers
Being a new two-dimensional layered compounds, the tunable indirect-direct band transformation of BiOCl with different layers can be realized by introducing the biaxial tensile or compressive strains. The band structure and stability of BiOCl with different layers are first researched to clarify the influence of layer numbers. A phase transformation of bilayer BiOCl and metallic characteristic for all are observed under large tensile and compressive strains, respectively. In addition, bond length, interlayer spacing, and band decomposed charge density are calculated to analyze the mechanism behind these phenomena. The results indicate that the band structure transformation is primarily related to the …
Vibration Effect On Magnetization And Critical Current Density Of Superconductors, Igor A. Golovchanskiy, Alexey V. Pan, Jonathan George, Frederick Wells, Sergey Fedoseev, Anatoly B. Rosenfeld
Vibration Effect On Magnetization And Critical Current Density Of Superconductors, Igor A. Golovchanskiy, Alexey V. Pan, Jonathan George, Frederick Wells, Sergey Fedoseev, Anatoly B. Rosenfeld
Australian Institute for Innovative Materials - Papers
In this work the effect of vibrations on critical current density ( Jc) of superconductors has been studied. The vibrations are shown to affect Jc of all types of superconductors during their measurements, employing a vibrating sample magnetometer (VSM). Increasing vibration frequency ( f ) and/or amplitude (A) leads to progressive reduction of Jc as a function of magnetic field (Ba). The effect of vibrations is substantially stronger in thin films. It leads to development of unexpected kinks on Jc (Ba) curves. Analysis of magnetization loops and relaxation of magnetization in YBCO films revealed that the vibration effect can be …
The Magneto-Structural Transition In Mn1-Xfexcoge, Qing Yon Ren, Wayne D. Hutchison, Jian Li Wang, Andrew J. Studer, M F. Md Din, S Munoz Perez, John M. Cadogan, Stewart J. Campbell
The Magneto-Structural Transition In Mn1-Xfexcoge, Qing Yon Ren, Wayne D. Hutchison, Jian Li Wang, Andrew J. Studer, M F. Md Din, S Munoz Perez, John M. Cadogan, Stewart J. Campbell
Australian Institute for Innovative Materials - Papers
Large refrigeration capacities, between 212(30) J kg-1 and 261(40) J kg-1 for a magnetic field change from 0 T to 5 T, were obtained in Mn1-xFexCoGe (x = 0.01, 0.02, 0.03 and 0.04) compounds. A partial magnetic phase diagram has been derived on the basis of magnetic transition and martensitic transformation temperatures determined from differential scanning calorimetry (200 K to 450 K), variable temperature x-ray diffraction (20 K to 310 K) and magnetisation measurements (5 K to 340 K; 0.01 T). Mn1-xFexCoGe compounds with compositions in the range x = 0.01 to 0.03 exhibit magneto-structural transitions. Neutron diffraction experiments were …
Electrochemically Active, Novel Layered M-Znv2o6 Nanobelts For Highly Rechargeable Na-Ion Energy Storage, Yan Sun, Chun-Sheng Li, Qiuran Yang, Shulei Chou, Hua-Kun Liu
Electrochemically Active, Novel Layered M-Znv2o6 Nanobelts For Highly Rechargeable Na-Ion Energy Storage, Yan Sun, Chun-Sheng Li, Qiuran Yang, Shulei Chou, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Electrode materials with a three-dimensional (3D) layered framework and excellent electrochemical stability can provide a new avenue for enhancing the overall performance of promising sodium ion batteries. Here, we show that layered monoclinic (m) - ZnV2O6 nanobelts with high chemical activity for Na-ion energy storage have been effectively fabricated via a rapid microwave irradiation method over the reaction time of 8 h, in which the fabricating efficiency is 24.5 times greater in comparison with the traditional hydrothermal method. The morphology and phase evolutions were verified by means of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. This study also …
Characterisation Of Graphene Fibres And Graphene Coated Fibres Using Capacitively Coupled Contactless Conductivity Detector, Joan M. Cabot, Emer Duffy, Sinead Currivan, Andres Ruland Palaia, Rouhollah Jalili, Attila J. Mozer, Peter C. Innis, Gordon G. Wallace, Michael C. Breadmore, Brett Paull
Characterisation Of Graphene Fibres And Graphene Coated Fibres Using Capacitively Coupled Contactless Conductivity Detector, Joan M. Cabot, Emer Duffy, Sinead Currivan, Andres Ruland Palaia, Rouhollah Jalili, Attila J. Mozer, Peter C. Innis, Gordon G. Wallace, Michael C. Breadmore, Brett Paull
Australian Institute for Innovative Materials - Papers
The use of capacitively coupled contactless conductivity detection (C 4 D) for the characterisation of thin conductive graphene fi bres, graphene composite fi bres, and graphene coated fi brous materials is demon- strated for the fi rst time. Within a few seconds, the non-destructive C 4 D detector provides a pro fi le of the longetudinal physical homogeneity of the fi bre, as well as extra information regarding fi bre mophology and composition. In addition to the theoretical considerations related to the factors a ff ect the output signal, this work evaluates the properties of graphene fi bres using scanning …
Systematic Elongation Of Thienyl Linkers And Their Effect On Optical And Electrochemical Properties In Carbazole-Bodipy Donor-Acceptor Systems, Alina Brzeczek, Katarzyna Piwowar, Wojciech Domagala, Mikotaj M. Mikotajczyk, Krzysztof Walczak, Pawel W. Wagner
Systematic Elongation Of Thienyl Linkers And Their Effect On Optical And Electrochemical Properties In Carbazole-Bodipy Donor-Acceptor Systems, Alina Brzeczek, Katarzyna Piwowar, Wojciech Domagala, Mikotaj M. Mikotajczyk, Krzysztof Walczak, Pawel W. Wagner
Australian Institute for Innovative Materials - Papers
Synthesis, spectral and electrochemical properties of a series of new panchromatic BODIPY donor-acceptor-donor derivatives, comprising carbazole conjugated with systematically elongated framework by thiophene-based linkers were investigated. It has been found that elongation of the π-system with one thiophene unit shifts the spectra toward near infrared, while incorporation of next thiophene derivatives has only limited influence on the lowest energy transition, causing no further shift of absorption maxima. Elongation of π-conjugation of the donor arm tunes the electron properties, influencing the ionization potential (IP) and electron affinity (EA) values of the molecules. The experimental results are supported by quantum chemical computations …
Elemental Distributions Within Multiphase Quaternary Pb Chalcogenide Thermoelectric Materials Determined Through Three-Dimensional Atom Probe Tomography, Sima Aminorroaya-Yamini, Tong Li, David R. G Mitchell, Julie M. Cairney
Elemental Distributions Within Multiphase Quaternary Pb Chalcogenide Thermoelectric Materials Determined Through Three-Dimensional Atom Probe Tomography, Sima Aminorroaya-Yamini, Tong Li, David R. G Mitchell, Julie M. Cairney
Australian Institute for Innovative Materials - Papers
Nanostructured multiphase p-type lead chalcogenides have shown the highest efficiencies amongst thermoelectric materials. However, their electronic transport properties have been described assuming homogenous distribution of dopants between phases. Here, we have analyzed elemental distributions in precipitates and matrices of nanostructured multiphase quaternary Pb chalcogenides doped to levels below and above the solubility limit of the matrix, using three-dimensional atom probe tomography. We demonstrate that partitioning of sodium and selenium occur between the matrix and secondary phase in both lightly- and heavily-doped compounds and that the concentrations of sodium and selenium in precipitates are higher than those in the matrices. This …
Tuning The Morphology Of Co3o4 On Ni Foam For Supercapacitor Application, Zheyin Yu, Zhenxiang Cheng, Zhixin Tai, Xiaolin Wang, Chandrasekar Mayandi Subramaniyam, Chunsheng Fang, Shaymaa Al-Rubaye, Xiaotian Wang, S X. Dou
Tuning The Morphology Of Co3o4 On Ni Foam For Supercapacitor Application, Zheyin Yu, Zhenxiang Cheng, Zhixin Tai, Xiaolin Wang, Chandrasekar Mayandi Subramaniyam, Chunsheng Fang, Shaymaa Al-Rubaye, Xiaotian Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
In this work, NH4F was used as a vital additive to control the morphology of Co3O4 precursors on Ni foam in a conventional hydrothermal reaction, and then, via thermal decomposition, to obtain Co3O4 material. The amount of NH4F plays a pivotal role in the formed morphology of the Co3O4 precursors, and four morphologies of Co3O4 were obtained through close control of the amount of additive: nanowires, thin nanowire-clusters, thick nanowire-clusters, and fan-like bulks. The morphological evolution process of the Co3O4 precursors has been investigated according to their intermediates at different reaction stages, and some novel growth mechanisms are proposed: (1) …
Lead-Free Snte-Based Thermoelectrics: Enhancement Of Thermoelectric Performance By Doping With Gd/Ag, Lijuan Zhang, Jian Li Wang, Zhenxiang Cheng, Qiao Sun, Zhen Li, S X. Dou
Lead-Free Snte-Based Thermoelectrics: Enhancement Of Thermoelectric Performance By Doping With Gd/Ag, Lijuan Zhang, Jian Li Wang, Zhenxiang Cheng, Qiao Sun, Zhen Li, S X. Dou
Australian Institute for Innovative Materials - Papers
SnTe, with the same rock-salt structure as PbTe, is a potentially attractive thermoelectric material. Pristine SnTe has poor thermoelectric performance because of its very high hole concentration resulting from intrinsic Sn vacancies, which leads to a high thermal conductivity and a low Seebeck coefficient. In this work, the thermoelectric properties of SnTe were modified by doping with different contents of gadolinium and silver. It is found that SnTe doped with optimal gadolinium (i.e. Gd0.06Sn0.94Te) exhibited extraordinarily low lattice thermal conductivity that is close to the theoretical minimum. The drastic reduction of lattice thermal conductivity is attributed to the formation of …
Improved Cycling Stability Of Lithium-Sulphur Batteries By Enhancing The Retention Of Active Material With A Sandwiched Hydrothermally Treated Graphite Film, Yuede Pan, Shulei Chou, Hua-Kun Liu, S X. Dou
Improved Cycling Stability Of Lithium-Sulphur Batteries By Enhancing The Retention Of Active Material With A Sandwiched Hydrothermally Treated Graphite Film, Yuede Pan, Shulei Chou, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
A new lithium-sulphur battery with a hydrothermally treated graphite film sandwiched between the separator and the sulphur cathode shows increased capacity, enhanced cycling stability and improved coulombic efficiency. After 50 cycles, a high capacity of 631 mA h g-1 is maintained, compared to 203 mA h g-1 for the Li-S battery with conventional configuration. Moreover, the coulombic efficiency is increased to near 100% from around 94%. This improved electrochemical performance could be attributed to the new cell configuration, because the graphite film greatly retains the active material by alleviating the polysulphide shuttling problem and providing extra reaction sites for sulphur …
Binder-Free And Carbon-Free 3d Porous Air Electrode For Li-O2 Batteries With High Efficiency, High Capacity, And Long Life, Wenbin Luo, Xuanwen Gao, Dongqi Shi, Shulei Chou, Jiazhao Wang, Hua-Kun Liu
Binder-Free And Carbon-Free 3d Porous Air Electrode For Li-O2 Batteries With High Efficiency, High Capacity, And Long Life, Wenbin Luo, Xuanwen Gao, Dongqi Shi, Shulei Chou, Jiazhao Wang, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
Pt-Gd alloy polycrystalline thin film is deposited on 3D nickel foam by pulsed laser deposition method serving as a whole binder/carbon-free air electrode, showing great catalytic activity enhancement as an efficient bifunctional catalyst for the oxygen reduction and evolution reactions in lithium oxygen batteries. The porous structure can facilitate rapid O2 and electrolyte diffusion, as well as forming a continuous conductive network throughout the whole energy conversion process. It shows a favorable cycle performance in the full discharge/charge model, owing to the high catalytic activity of the Pt-Gd alloy composite and 3D porous nickel foam structure. Specially, excellent cycling performance …
Host Structural Stabilization Of Li1.232mn0.615ni0.154o2 Through K-Doping Attempt: Toward Superior Electrochemical Performances, Zhuo Zheng, Xiao Dong Guo, Yan Jun Zhong, Wei-Bo Hua, Chong-Heng Shen, Shulei Chou, Xiu-Shan Yang
Host Structural Stabilization Of Li1.232mn0.615ni0.154o2 Through K-Doping Attempt: Toward Superior Electrochemical Performances, Zhuo Zheng, Xiao Dong Guo, Yan Jun Zhong, Wei-Bo Hua, Chong-Heng Shen, Shulei Chou, Xiu-Shan Yang
Australian Institute for Innovative Materials - Papers
Lithium-rich layered cathodes are known famously for its superior capacity over traditional layered oxides but trapped for lower initial coulombic efficiency, poorer rate capability and worse cyclic stability in spite of diverse attempts. Herein, a new K-stabilized Li-rich layered cathode synthesized through a simple oxalate co-precipitation is reported for its super electrochemical performances. Compared with pristine Li-rich layered cathode, K-stabilized one reaches a higher initial coulombic efficiency of 87% from 76% and outruns for 94% of capacity retention and 244 mAh g-1 of discharge capacity at 0.5C after 100 cycles. Moreover, 133 mAh g-1 of discharge capacity can be delivered …
Aqueous Electrosynthesis Of An Electrochromic Material Based Water-Soluble Edot-Menh2 Hydrochloride, Hui Sun, Long Zhang, Liqi Dong, Xiaofei Zhu, Shouli Ming, Youshan Zhang, Huakun Xing, Xuemin Duan, Jingkun Xu
Aqueous Electrosynthesis Of An Electrochromic Material Based Water-Soluble Edot-Menh2 Hydrochloride, Hui Sun, Long Zhang, Liqi Dong, Xiaofei Zhu, Shouli Ming, Youshan Zhang, Huakun Xing, Xuemin Duan, Jingkun Xu
Australian Institute for Innovative Materials - Papers
2'-Aminomethyl-3,4-ethylenedioxythiophene (EDOT-MeNH2) showed unsatisfactory results when its polymerization occurred in organic solvent in our previous report. Therefore, a water-soluble EDOT derivative was designed by using hydrochloric modified EDOT-MeNH2 (EDOT-MeNH2·HCl) and electropolymerized in aqueous solution to form the corresponding polymer with excellent electrochromic properties. Moreover, the polymer was systematically explored, including electrochemical, optical properties and structure characterization. Cyclic voltammetry showed low oxidation potential of EDOT-MeNH2·HCl (0.85 V) in aqueous solution, leading to the facile electrodeposition of uniform the polymer film with outstanding electroactivity. Compared with poly(2′-aminomethyl- 3,4-ethylenedioxythiophene) (PEDOT-MeNH2), poly(2′-aminomethyl-3,4-ethylenedioxythiophene salt) (PEDOT-MeNH3 +A-) revealed higher efficiencies (156 cm2 C-1), lower bandgap (1.68 …
A Green And Facile Way To Prepare Granadilla-Like Silicon-Based Anode Materials For Li-Ion Batteries, Lei Zhang, Ranjusha Rajagopalan, Haipeng Guo, Xianluo Hu, S X. Dou, Hua-Kun Liu
A Green And Facile Way To Prepare Granadilla-Like Silicon-Based Anode Materials For Li-Ion Batteries, Lei Zhang, Ranjusha Rajagopalan, Haipeng Guo, Xianluo Hu, S X. Dou, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
A yolk-shell-structured carbon@void@silicon (CVS) anode material in which a void space is created between the inside silicon nanoparticle and the outer carbon shell is considered as a promising candidate for Li-ion cells. Untill now, all the previous yolk-shell composites were fabricated through a templating method, wherein the SiO2 layer acts as a sacrificial layer and creates a void by a selective etching method using toxic hydrofluoric acid. However, this method is complex and toxic. Here, a green and facile synthesis of granadilla-like outer carbon coating encapsulated silicon/carbon microspheres which are composed of interconnected carbon framework supported CVS nanobeads is reported. …
Enhancement Of Dye Regeneration Kinetics In Dichromophoric Porphyrin-Carbazole Triphenylamine Dyes Influenced By More Exposed Radical Cation Orbitals, Long Zhao, Pawel W. Wagner, Jonathan E. Barnsley, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila J. Mozer
Enhancement Of Dye Regeneration Kinetics In Dichromophoric Porphyrin-Carbazole Triphenylamine Dyes Influenced By More Exposed Radical Cation Orbitals, Long Zhao, Pawel W. Wagner, Jonathan E. Barnsley, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila J. Mozer
Australian Institute for Innovative Materials - Papers
Reduction kinetics of oxidized dyes absorbed on semiconductor surfaces and immersed in redox active electrolytes has been mainly modeled based on the free energy difference between the oxidation potential of the dye and the redox potential of the electrolyte. Only a few mechanisms have been demonstrated to enhance the kinetics by other means. In this work, the rate constant of the reduction of oxidized porphyrin dye is enhanced by attaching non-conjugated carbazole triphenylamine moiety using iodine/triiodide and tris(2,2′-bispyridinium)cobalt II/III electrolytes. These results are obtained using transient absorption spectroscopy by selectively probing the regeneration kinetics at the porphyrin radical cation and …
High-Performance Multifunctional Graphene-Plga Fibers: Toward Biomimetic And Conducting 3d Scaffolds, Dorna Esrafilzadeh, Rouhollah Jalili, Elise M. Stewart, Seyed Hamed Aboutalebi, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace
High-Performance Multifunctional Graphene-Plga Fibers: Toward Biomimetic And Conducting 3d Scaffolds, Dorna Esrafilzadeh, Rouhollah Jalili, Elise M. Stewart, Seyed Hamed Aboutalebi, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The development of electrically conducting fibers based on known cytocompatible materials is of interest to those engaged in tissue regeneration using electrical stimulation. Herein, it is demonstrated that with the aid of rheological insights, optimized formulations of graphene containing spinnable poly(lactic-co-glycolic acid) (PLGA) dopes can be made possible. This helps extend the general understanding of the mechanics involved in order to deliberately translate the intrinsic superior electrical and mechanical properties of solution-processed graphene into the design process and practical fiber architectural engineering. The as-produced fibers are found to exhibit excellent electrical conductivity and electrochemical performance, good mechanical properties, and cellular …
Moo2/Mo2c/C Spheres As Anode Materials For Lithium Ion Batteries, Mohammad Ihsan, Hongqiang Wang, Siti R. Majid, Jianping Yang, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu
Moo2/Mo2c/C Spheres As Anode Materials For Lithium Ion Batteries, Mohammad Ihsan, Hongqiang Wang, Siti R. Majid, Jianping Yang, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
MoO2/Mo2C/C spheres have been synthesized through hydrothermal and calcination processes. MoO2 is well known for its high theoretical capacity of 838 mAh g-1, but undergoes capacity fading during Li+ insertion/extraction processes. Mo2C has high specific conductance (1.02 x 102 S cm-1) that can provide better electronic conductivity. Carbon is popular for its ability to accommodate the volume variation during charge/discharge. By taking advantage of the combination of Mo2C and C, these MoO2/Mo2C/C spheres demonstrate not only high cycling performance, but also good rate capability when they are used as anode materials for lithium ion batteries. After 100 cycles at 100 …
Hierarchical Nafion Enhanced Carbon Aerogels For Sensing Applications, Bo Weng, Ailing Ding, Yuqing Liu, Jianglin Diao, Joselito M. Razal, King Tong Lau, Roderick L. Shepherd, Changming Li, Jun Chen
Hierarchical Nafion Enhanced Carbon Aerogels For Sensing Applications, Bo Weng, Ailing Ding, Yuqing Liu, Jianglin Diao, Joselito M. Razal, King Tong Lau, Roderick L. Shepherd, Changming Li, Jun Chen
Australian Institute for Innovative Materials - Papers
This work describes the fabrication of hierarchical 3D Nafion enhanced carbon aerogels (NECAGs) for sensing applications via a fast freeze drying method. Graphene oxide, multiwalled carbon nanotubes and Nafion were mixed and extruded into liquid nitrogen followed by the removal of ice crystals by freeze drying. The addition of Nafion enhanced the mechanical strength of NECAGs and effective control of the cellular morphology and pore size was achieved. The resultant NECAGs demonstrated high strength, low density, and high specific surface area and can achieve a modulus of 20 kPa, an electrical conductivity of 140 S m-1, and a specific capacity …
Developments In Conducting Polymer Fibres: From Established Spinning Methods Toward Advanced Applications, Azadehsadat Mirabedini, Javad Foroughi, Gordon G. Wallace
Developments In Conducting Polymer Fibres: From Established Spinning Methods Toward Advanced Applications, Azadehsadat Mirabedini, Javad Foroughi, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Conducting polymers have received increasing attention in both fundamental research and various fields of application in recent decades, ranging in use from biomaterials to renewable energy storage devices. Processing of conducting polymers into fibrillar structures through spinning has provided some unique capabilities to their final applications. Compared with non fibrillar forms, conducting polymer fibres are expected to display improved properties arising mainly from their low dimensions, well-oriented polymer chains, light weight and large surface area to volume ratio. Spinning methods have been employed effectively to produce technological conducting fibres from nanoscale to hundreds of micrometre sizes with controlled properties. This …
Point Defects In Epitaxial Silicene On Ag(111) Surfaces, Hongsheng Liu, Haifeng Feng, Yi Du, Jian Chen, Ke-Hui Wu, Jijun Zhao
Point Defects In Epitaxial Silicene On Ag(111) Surfaces, Hongsheng Liu, Haifeng Feng, Yi Du, Jian Chen, Ke-Hui Wu, Jijun Zhao
Australian Institute for Innovative Materials - Papers
Silicene, a counterpart of graphene, has achieved rapid development due to its exotic electronic properties and excellent compatibility with the mature silicon-based semiconductor technology. Its low room-temperature mobility of ~100 cm2 V−1 s−1, however, inhibits device applications such as in field-effect transistors. Generally, defects and grain boundaries would act as scattering centers and thus reduce the carrier mobility. In this paper, the morphologies of various point defects in epitaxial silicene on Ag(111) surfaces have been systematically investigated using first-principles calculations combined with experimental scanning tunneling microscope (STM) observations. The STM signatures for various defects in epitaxial silicene on Ag(111) surface …