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2020

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Cosmostruct Ural Model Of The Malguzar Mountains For Ore Bearing Data Processing On The Laiyagun Mineralized Zone, A Abdullayev, O Zokirov, G Anna, E Kutie, Sh Akhmedov Dec 2020

Cosmostruct Ural Model Of The Malguzar Mountains For Ore Bearing Data Processing On The Laiyagun Mineralized Zone, A Abdullayev, O Zokirov, G Anna, E Kutie, Sh Akhmedov

Technical science and innovation

Analysis of geological prospecting, geological surveying, geochemical and other materials of the territory of the Malguzar Mountains allows us to note that here the ore-bearing formations are Silurian formations (sandstones, gravelstones, shales), crumpled into folds, which are complicated by a series of faults of north-west strike, zones of splitting and etc. These structures are rectilinear, their zone is characterized by the presence of small fracture structures, areas of swellings (Liyagun mineralized zone) and splits (Ardakshan area). The reason for these swelling and splitting, where gold mineralization is noted, remains not fully studied. The importance of studying these features of ore-controlling …

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Methods And Tools Of Cement Production Process (Comparative Analysis), Potential Of Uzbekistan In This Area, Khudaykulov Umid, S Turgunbayev Dec 2020

Methods And Tools Of Cement Production Process (Comparative Analysis), Potential Of Uzbekistan In This Area, Khudaykulov Umid, S Turgunbayev

Technical science and innovation

the article describes the history of cement use, its initial appearance, cement composition and its physicochemical structure and properties, types of cement and classifications of cement. Cement production processes, technological methods used in production, advantages and disadvantages of the methods and technological stages of the production process by the drying method of cement production are covered. A study of the cement industry and processes in the country was conducted, which summarized the most priority methods and processes of cement production based on the natural resources, climate and potential of Uzbekistan.

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Stimulus Of Specialization On Postgraduate Students’ Application Of Mobile Technologies For Learning, Amos Ochayi Onojah, Adenike Aderogba Onojah, Nwadubike Edwin Nweke-Richards Dec 2020

Stimulus Of Specialization On Postgraduate Students’ Application Of Mobile Technologies For Learning, Amos Ochayi Onojah, Adenike Aderogba Onojah, Nwadubike Edwin Nweke-Richards

Journal of Educational Technology Development and Exchange (JETDE)

Most students could be adopting the mobile technologies available but may not be for learning purposes. This study investigated the postgraduate students’ application of mobile technologies for learning and examined the differences in the application of mobile technologies by postgraduate students based on their area of specialization. The study was a quantitative research design. The population comprised all postgraduates’ students in Nigeria out of which 750 of them were purposively sampled across eleven universities based on accessibility. The data for the study was gathered using a Researchers-developed questionnaire. Statistical form of Mean was used to answer the research questions while …

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Materials For Sustainable Constructions: Concrete And Masonry., Mohamed Abdel-Ghaffar, Ahmed Ahmed Rizk Dec 2020

Materials For Sustainable Constructions: Concrete And Masonry., Mohamed Abdel-Ghaffar, Ahmed Ahmed Rizk

Mansoura Engineering Journal

There is a lot of imagery associated with the term "environmentally". Environmentally friendly products (Green products) –from the photovoltaic panels to the buildings made up of Aluminuum cans and old tires- look distinctive. Green building materials are green in the way they are manufactured, used, and recycled after use. What is meant here are alternative agricultural, recycled content, nontoxic, and energy efficient products that may display environmental ethics. Prior to the industrial revolution, society met most of their needs with materials from the earth and then returned to the earth after use. Nowadays, many green products are gaining ground in …

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Normal And High-Strength R/C Deep Beams Under Pure Torsion And Codes Evaluation., Ahmed Yousef Dec 2020

Normal And High-Strength R/C Deep Beams Under Pure Torsion And Codes Evaluation., Ahmed Yousef

Mansoura Engineering Journal

Fourteen reinforced concrete deep beams were tested under pure torsion in order to evaluate the torsion design provisions of ACI 318-02 Building Code, the Egyptian code (ECCS-2001), the New Zealand code (NZS 3101-95), and the Eurocode 2 (EC-2) when applied to High Strength Concrete (HSC) deep beams. The results of these tests have been used to compare the torsional behavior of reinforced deep beams constructed from Normal-Strength Concrete (NSC with characteristic cube compressive strength fcu of about 35 MPa) and HSC (with fcu of about 81 MPa). The main parameters examined in this study were the design compressive strength, the …

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Hydraulic Jump In Circular Open Channels., I. Rashwan Dec 2020

Hydraulic Jump In Circular Open Channels., I. Rashwan

Mansoura Engineering Journal

The hydraulic jump is a transitional slate from an upstream supercritical to downstream subcritical flow, and, for a given set of flow conditions, it has a fixed position length. The phenomenon of the hydraulic jump has been widely studied because of its frequent occurrence in nature, and because of its uses in many practical applications. In the present study the momentum principle is used to derive an equation expressed the hydraulic jump occurred in a short horizontal reach of a circular open channel. The derived equation indicates that the initial water depth and sequent water depth (conjugate depths) are functions …

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The Effect Of Rust Removal Agent On Bond Strength Of Reinforcing Steel Bars., Sayed Abdelbaky Dec 2020

The Effect Of Rust Removal Agent On Bond Strength Of Reinforcing Steel Bars., Sayed Abdelbaky

Mansoura Engineering Journal

When reinforcing bars start corroding inside the concrete, it is difficult to arrest the corrosion process without using any technique to protect the reinforcing bars against corrosion. One of these techniques, is removing the contaminated concrete around steel bars and cleaning them by using sand blast to remove the rust. Sand blast is not easy to use especially in closed areas where it results in high pollution and may cause suffocation to workers. Thus, a chemical agent was developed by chemical called rust ̶ stop or rust removal to clean the corroded reinforcing bars instead of sand blast. The purpose …

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Experimental Analysis Of Impulse Characteristics Of Grounding Grids With And Without Rods., S. El-Drieny, Magdy Mohamed El-Saadawi, I. Metwally Dec 2020

Experimental Analysis Of Impulse Characteristics Of Grounding Grids With And Without Rods., S. El-Drieny, Magdy Mohamed El-Saadawi, I. Metwally

Mansoura Engineering Journal

Impulse characteristics of grounding systems have a great influence on proper evaluation of substation equipment stresses from lightning overvoltages, protection and design points of view. The grounding grid impulse characteristics depend on: grid parameters and soil characteristics as well as on the impulse current shape, magnitude and discharge point. The addition of driven rods to the grid has an action on grounding grid impulse characteristics. This paper presents an experimental study for determining the impedance of grounding grid with and without driven rods. Tests are conducted on three scale models to simulate single-, double- and triple layer soils. Also, the …

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Transient And Steady State Analysis Of High Efficiency Single-Phase Induction Motor., Yasser Dessouky, Hamdy Ashour Dec 2020

Transient And Steady State Analysis Of High Efficiency Single-Phase Induction Motor., Yasser Dessouky, Hamdy Ashour

Mansoura Engineering Journal

Operating a three-phase induction motor from a single-phase supply via three capacitors is studied. The capacitor values may be adjusted so as to get a motor balanced mode of operation. The model of the machine is derived using instantaneous symmetrical components. Equations describing die machine dynamics have been derived then used to simulate and analyze the machine performance for different modes of operation. The machine transient and steady stale performance is predicted using Malab-Simulink software, Experimental results have been obtained and compared with the simulated waveforms, showing the effectiveness of the proposed machine model.

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Estimation Of The Speed Of Rotation Of Gears In Oil Depending On The Load, Ramzjon Hamroyev, N Mirzayev, B Qurbonov Dec 2020

Estimation Of The Speed Of Rotation Of Gears In Oil Depending On The Load, Ramzjon Hamroyev, N Mirzayev, B Qurbonov

Technical science and innovation

This article shows the wear and the amount of load that occurs in the gears under different loads and under different operating conditions of the contact surfaces, and is given by the formulas. The values of loads and wear rates on gears are given in tabular form based on curves. According to the results of the study, an increase in the load value affects the wear rate, as well as the load values q = 100; 200; 300; 400; at N/mm, a decrease in the wear rate was found. The load concentration and accumulation of dislocations in the material, their …

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Metrological Certification And Test Conditions For Verification Equipment, A Turgunbaev, H Usmanova, O Abdurakhmanov Dec 2020

Metrological Certification And Test Conditions For Verification Equipment, A Turgunbaev, H Usmanova, O Abdurakhmanov

Technical science and innovation

The article analyzes the metrological certification and test conditions for verification equipment. The main tasks of metrological certification, test conditions, accuracy characteristics of verification equipment, primary, repeated and periodic, expert and inspection certification of verification equipment are considered in the article. Besides, the major tasks of the testing equipment certification are considered as well. They are: establishing the current testing equipment eligibility in accordance with its purpose, establishing the actual reproducibility values of test conditions implemented by testing equipment and assessing the technical characteristics compliance of testing equipment with the safety, hygienic and other special requirements

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Decomposition Method For Modeling And Research Of Pulse-Frequency Control Systems, A Kadirov, Amir A Kadirov Dec 2020

Decomposition Method For Modeling And Research Of Pulse-Frequency Control Systems, A Kadirov, Amir A Kadirov

Technical science and innovation

. The pulse-frequency control systems are widely used in radar, space industry, for control of technological processes and robots and many other areas. Today, there are various approximate and accurate methods for the analysis and synthesis of pulse-frequency systems (PFS). However, the area of the practical application of the existed methods is mainly limited to single-variable systems. The classical methods provide the consideration of the initial structures of pulse-frequency systems as a whole. This article proposes the decomposition method for modeling and research pulse-frequency automatic control systems. The method is based on the mathematical apparatus of signal-flow graphs. We can …

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A Genetic-Based Approach For Solving Optimal Power Flow Problem., Magdy Mohamed El-Saadawi Dec 2020

A Genetic-Based Approach For Solving Optimal Power Flow Problem., Magdy Mohamed El-Saadawi

Mansoura Engineering Journal

The optimal power flow (OPF) is an optimization problem, in which the utility strives to minimize its costs while satisfying all of its constraints. Artificial intelligence is used to help a hypothetical electric utility nieet its electric load economically. A genetic algorithm (GA) —a specific type of artificial intelligence—is employed to perform this optimization. In this paper, a genetic algorithm is used to solve the OPF problem. A new genetic chromosome is structured to represent the solutions. The new chromosome structure is chosen in such a way that it greatly reduce the number of times the algorithm must solve the …

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Guns-For-Hire: Chinese Mercenaries On The 21st Century Silk Road, Carl H. Peterson Iv Dec 2020

Guns-For-Hire: Chinese Mercenaries On The 21st Century Silk Road, Carl H. Peterson Iv

Washington International Law Journal

There has been an increased global use of private military contractors (PMCs) since the large-scale American use of them in the wars in Afghanistan and Iraq. This has included an increase in Russian and now Chinese PMCs. As China continues to develop its Belt and Road Initiative (BRI), it is likely that the world will see an increase in the number of Chinese PMCs used to protect these projects. In this event it is important to bring Chinese PMCs into the PMC industry’s most effective private regulatory bodies, as these bodies are often more effective at ensuring ethical PMC conduct …

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Plastic Crystal - Gel Polymer Electrolytes For Magnesium Rechargeable Batteries, Diyana Hambali Dec 2020

Plastic Crystal - Gel Polymer Electrolytes For Magnesium Rechargeable Batteries, Diyana Hambali

Student Works (2020-2029)

Polymer electrolytes are known to be the possible substitution for liquid electrolytes due to their excellent safe performance and good compatibility with electrodes compared to its liquid counterpart. Thus, in the present work, gel polymer electrolytes (GPEs) have been studied comprising plastic crystal succinonitrile (SN) to form plastic crystal - gel polymer electrolytes. The GPEs were prepared by using two types of magnesium salts which are magnesium trifluoromethanesulfonate (MgTf2) and magnesium bis(trifluoromethanesulfonimide) (Mg(TFSI)2) varied from 5 to 30 wt.%. In the preparation of GPEs, four GPE systems were introduced which are single plasticized systems (PVdC-co-AN/SN/MgTf2 and PVdC-co-AN/SN/Mg(TFSI)2) and double plasticized …

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China’S Bri In Central Eastern European Countries: “17+1” Connectivity, Divisiveness, Or Pathway To Eu-China Fta?, Ronald C. Brown Dec 2020

China’S Bri In Central Eastern European Countries: “17+1” Connectivity, Divisiveness, Or Pathway To Eu-China Fta?, Ronald C. Brown

San Diego International Law Journal

China’s Belt and Road Initiative (BRI) continues to embrace and connect China with European Union (EU) Member countries; the latest in 2019 with Italy, a G-7 member, also joining. EU members participating in the BRI include Poland, Greece, Italy, Hungary, Czechoslovakia, Croatia, Bulgaria, Latvia, Portugal, Romania, and Slovakia. While Germany and France lead the EU in trade and investment with China, political winds may be blowing. The EU has noticed that the seventeen Central and Eastern European countries (CEEC) under the “17+1” format, a majority of which are EU members, are capturing greater amounts of Chinese trade under their BRI …

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An Integrated Three-Flow Approach For Front-End Service Composition, Lim Mei Ting Dec 2020

An Integrated Three-Flow Approach For Front-End Service Composition, Lim Mei Ting

Student Works (2020-2029)

End-User Service Composition (EUSC) aims to enable end-user programmers who are not professional developers, develop applications by composing or aggregating existing web services. Despite the effort, studies have shown that end-user programmers are not able to deal with the technical complexities involved in EUSC. One way to deal with this issue is Front-End Service Composition (FESC), which allows end-user programmers to compose web services at the presentation layer of an application by configuring User Interface (UI) widgets that represent the back-end web services. However, apart from there not being enough studies on FESC, end-user programmers also experience a number of …

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A Method For Classifying Ecg Signals With Different Possible States On A Multilayer Perceptron, Sherzod Nematov, Y Talatov Dec 2020

A Method For Classifying Ecg Signals With Different Possible States On A Multilayer Perceptron, Sherzod Nematov, Y Talatov

Technical science and innovation

To automatically determine the state of the cardiovascular system based on the recorded ECG signals, an artificial neural network is trained to classify signals into various possible states. At the same time, the parameters of heart rate variability (HRV) were extracted from the ECG signals and used as input functions for the neural network. HRV is the fluctuation in the time intervals between adjacent heartbeats. For this, the architecture of a neural network based on a multilayer perceptron and a method for obtaining the necessary parameters in the learning process have been developed, and the classification efficiency has been checked …

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Epitaxial Growth Of Semi-Polar (11-22) Gallium Nitride For Uv Photosensing Application, Abdullah Haaziq Ahmad Makinudin Dec 2020

Epitaxial Growth Of Semi-Polar (11-22) Gallium Nitride For Uv Photosensing Application, Abdullah Haaziq Ahmad Makinudin

Student Works (2020-2029)

Semi-polar (11-22) gallium nitride (GaN) epilayers have attracted numerous interests in GaN based technology as it possess significant advantages over its polar (c-plane) counterparts such as low to none spontaneous and piezoelectric polarization which is known to impair the device performance. However, growth along semi-polar (11-22) orientation has been known to exhibit numerous defect densities such as dislocations and stacking faults (SFs). In order to acquire high quality semi-polar (11-22) GaN epilayers, various growth optimizations must be employed. In this work, the semi-polar (11-22) GaN epilayers were grown on planar m-plane sapphire substrate with the use of a 2-inch capability …

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Novel Electrochemical Sensor Based On Integration Of Nanoporous Gold With Molecularly Imprinted Polymer For Detection Of Arsenic Ion(Iii), Wu-Wei Ma, Qi-Gang Chang, Xiong-Fang Shi, Yan-Bin Tong, Li Zhou, Bang-Ce Ye, Jian-Jiang Lu, Jin-Hu Zhao Dec 2020

Novel Electrochemical Sensor Based On Integration Of Nanoporous Gold With Molecularly Imprinted Polymer For Detection Of Arsenic Ion(Iii), Wu-Wei Ma, Qi-Gang Chang, Xiong-Fang Shi, Yan-Bin Tong, Li Zhou, Bang-Ce Ye, Jian-Jiang Lu, Jin-Hu Zhao

Journal of Electrochemistry

Arsenic, a toxic chemical element, is detrimental to environment and human health in particular. Therefore, the development of simple, fast, and accurate arsenic ion (As3+) detection methods has attracted extensive attention. In this work, an electrochemical sensor based on molecular imprinted polymer (MIP) and nano-porous gold (NPG) modified indium tin oxide (ITO) electrode (MIP/NPG/ITO) was developed for determination of As3+ in water with different quality. NPG with high conductivity, large specific surface area and high biocompatibility was prepared in situ on ITO surface by a green electrodeposition method using simple and controllable steps. Then, a layer of …

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Effect Of 18-Crown-6 Additive On Chromium Electrodeposition In Ionic Liquid, Yi-Jie Wang, Dong-Fang Niu, Xin-Sheng Zhang Dec 2020

Effect Of 18-Crown-6 Additive On Chromium Electrodeposition In Ionic Liquid, Yi-Jie Wang, Dong-Fang Niu, Xin-Sheng Zhang

Journal of Electrochemistry

Trivalent chromium ion (Cr3+) is used for electrodeposition due to its low toxicity. Electrodeposition in ionic liquids can greatly solve for hydrogen evolution problem. However,as a widely used Cr(III) precursor, chromium chloride hydrate (CrCl3·6H2O), still contains water. In the presence of water, Cr3+ will form a complex coordination structure with water molecules ([Cr(H2O)6]3+), which is a stable octahedral structure and is difficult to be directly reduced to chromium metal. Therefore, coordination agents should be added into the bath. In this work, the effect of 18-Crown-6 additive on …

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A Trial For Mitigation Of Waterlogging Problem In New Reclaimed Areas In The Desert Fringes Of Beni Suef And El-Minya Governorates, Egypt., Mohamed Gad Dec 2020

A Trial For Mitigation Of Waterlogging Problem In New Reclaimed Areas In The Desert Fringes Of Beni Suef And El-Minya Governorates, Egypt., Mohamed Gad

Mansoura Engineering Journal

Expanding the reclamation of new lands within the unlimited desert area of Egypt has started to face the continuous growth of population and the urgent need for food security. The reclamation of the Nile valley's desert fringes affects its traditional cultivated areas as a result of the difference in the topographic level, inadequate drainage system and the existence of shallow depth clay lenses beneath these sites which creates a perched condition that helps greatly in fasting the rising rate of water table. The present paper threw light on a trial to mitigate the waterlogging problem due to the reclamation activities …

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An Improved Single Phase Full Bridge Inverter Using Sequential Triggering For Achieving Zero Voltage Without Inductor., Mohamed Galal Osman, Saad Saad Eskander, Ahmed Mosa Dec 2020

An Improved Single Phase Full Bridge Inverter Using Sequential Triggering For Achieving Zero Voltage Without Inductor., Mohamed Galal Osman, Saad Saad Eskander, Ahmed Mosa

Mansoura Engineering Journal

This paper introduces new technique for triggering full bridge inverter based on power transistor as switches. This method based on the design of a sequential timer as triggering circuits. The designed timer is designed to trigger the power switches of the two branches of the inverter and provides enough delay time between the triggering signals of the inverter branches. The interval of the delay time must be properly chosen to ensure that the current of branch reaches to its zero before applying the triggering to the second branch of the inverter. Consequently, the load current crosses the zero value and …

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Degradation And Thermal Characteristics Of Lini0.8Co0.15Al0.05O2/Graphite Lithium Ion Battery After Different State Of Charge Ranges Cycling, Cun Wang, Wei-Jiang Zhang, Teng-Fei He, Bo Lei, You-Jie Shi, Yao-Dong Zheng, Wei-Lin Luo, Fang-Ming Jiang Dec 2020

Degradation And Thermal Characteristics Of Lini0.8Co0.15Al0.05O2/Graphite Lithium Ion Battery After Different State Of Charge Ranges Cycling, Cun Wang, Wei-Jiang Zhang, Teng-Fei He, Bo Lei, You-Jie Shi, Yao-Dong Zheng, Wei-Lin Luo, Fang-Ming Jiang

Journal of Electrochemistry

The LiNi0.8Co0.15Al0.05O2 (NCA) cathode exhibits high energy density and large reversible capacity, which plays an essential role in the field of electric vehicles (EVs). However, low capacity retention and poor thermal stability limit its application. Few literatures are found for the capacity degradation mechanism of NCA/graphite batteries at home and abroad. The different state of charge (SOC) ranges cycle degradation behaviors of 18650-type NCA/graphite (2.4 Ah) battery were studied in this paper. The SOC ranges considered were 0% ~ 20% (low), 20% ~ 70% (medium), 70% ~ 100% (high), and 0% ~ 100% …

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Preparations And Sodium Storage Properties Of Ni3S2@Cnt Composite, Ming-Tao Duan, Yan-Shuang Meng, Hong-Shuai Zhang Dec 2020

Preparations And Sodium Storage Properties Of Ni3S2@Cnt Composite, Ming-Tao Duan, Yan-Shuang Meng, Hong-Shuai Zhang

Journal of Electrochemistry

Transition metal sulfides (TMSs)-based electrode materials with highly reversible sodium storage have attracted extensive attentions as one of the most prospective electrode materials for sodium ion batteries (SIBs). However, low cycling stability and rate property caused by large volume expansion and poor electronic conductivity during the electrochemical reaction still hamper their further practical application. In this work, in-situ encapsulated Ni3S2 nanoparticles in carbon nanotubes (Ni3S2@CNT) have been successfully fabricated as an anode material for high-performance SIBs by a one-step solid-phase calcination process. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), …

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Effect Of Stereotaxically-Constructed Graphene On The Negative Electrode Performance Of Lead-Acid Batteries, Pin-Song Chen, Yi-Tao Hu, Xin-Yi Zhang, Pei-Kang Shen Dec 2020

Effect Of Stereotaxically-Constructed Graphene On The Negative Electrode Performance Of Lead-Acid Batteries, Pin-Song Chen, Yi-Tao Hu, Xin-Yi Zhang, Pei-Kang Shen

Journal of Electrochemistry

With the advantages of high ratio surface area, excellent conductivity and high stability, the stereotaxically-constructed graphene (SCG) material was added to the negative active material (NAM) of lead-acid battery for improving battery performance. XRD, SEM and cyclic voltammetry tests were carried out to analyze the influence of SCG on negative active material. It is found that the conversion efficiency of lead sulfate to lead in the negative active material added with SCG material was higher than that of control group, and the particle size of the lead sulfate obtained after the discharge reaction was smaller, which are favorable factors for …

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Core-Shell Structured Ru@Ptru Nanoflower Electrocatalysts Toward Alkaline Hydrogen Evolution Reaction, Xue-Liang Wang, Yuan-Yuan Cong, Chen-Xi Qiu, Sheng-Jie Wang, Jia-Qi Qin, Yu-Jiang Song Dec 2020

Core-Shell Structured Ru@Ptru Nanoflower Electrocatalysts Toward Alkaline Hydrogen Evolution Reaction, Xue-Liang Wang, Yuan-Yuan Cong, Chen-Xi Qiu, Sheng-Jie Wang, Jia-Qi Qin, Yu-Jiang Song

Journal of Electrochemistry

Water electrolysis for hydrogen production is beneficial for solving the problem of energy crisis and environmental issues. It is necessary to study highly active and cost-effective catalysts toward hydrogen evolution reaction (HER) to reduce the consumption of noble metals. Herein, we report the synthesis of core-shell structured Ru@Pt0.24Ru nanoflowers electrocatalyst by stepwise reduction of Ru and Pt precursors in the mixture of oleylamine and benzyl alcohol at 160 oC. The average diameter of the resultant Ru@Pt0.24Ru was 16.5±4.0 nm with a bulk atomic ratio between Pt and Ru of 0.24:1 and a surface ratio of …

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Preparations And Photoelectrochemical Performances Of Rgo-Tio2 Nanotubes Arrays, Ze-Yang Zhang, Lan Sun, Chang-Jian Lin Dec 2020

Preparations And Photoelectrochemical Performances Of Rgo-Tio2 Nanotubes Arrays, Ze-Yang Zhang, Lan Sun, Chang-Jian Lin

Journal of Electrochemistry

Decorating TiO2 nanotube arrays with RGO to improve the photocatalytic activity of TiO2 nanotube arrays has been reported. For the reported RGO-TiO2 nanotube arrays, TiO2 nanotube arrays were prepared by anodizing the high-purity Ti foil in an organic electrolyte for multiple-step treatments, while RGO were deposited on TiO2 nanotube arrays by using cyclic voltammetry or other electrical reduction methods. To enhance the reduction degree and the coverage of RGO on the resultant RGO-TiO2 nanotube arrays, in this work, the one-step electrochemical anodization in hydrofluoric acid was used to fabricate TiO2 nanotube arrays with …

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Effect Of Reaction Conditions On Cu⁃Catalyzed Co2 Electroreduction, Chang Zhu, Wei Chen, Yan-Fang Song, Xiao Dong, Gui-Hua Li, Wei Wei, Yu-Han Sun Dec 2020

Effect Of Reaction Conditions On Cu⁃Catalyzed Co2 Electroreduction, Chang Zhu, Wei Chen, Yan-Fang Song, Xiao Dong, Gui-Hua Li, Wei Wei, Yu-Han Sun

Journal of Electrochemistry

Electrochemical conversion of carbon dioxide (CO2) driven by renewable electricity that can meet both carbon emission reduction and renewable energy utilization has been rapidly developed in recent years. Copper (Cu) catalyst has long been a promising candidate for CO2 electroreduction applications because of its natural abundance and specific capability of producing a substantial amount of C2 products. However, various metallic Cu electrodes reported have been significantly influenced by the adsorption of certain cation/anion ions, resulting in wide-span catalytic activities and selectivity for various products. In addition, a recent report demonstrated that by virtue of gas-diffusion flow cell …

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Preparation And Process Optimization Of Cathode Materials For Lithium-Sulfur Batteries, Kai Wu Dec 2020

Preparation And Process Optimization Of Cathode Materials For Lithium-Sulfur Batteries, Kai Wu

Journal of Electrochemistry

Lithium-sulfur (Li-S) batteries represent promising candidates for next-generation energy storage system due to their high energy density and low material cost. However, the industrial application of Li-S batteries remains challenges because of the shuttle effect from lithium polysulfides and the lack of facial routes for Li-S battery preparation. To solve these problems, a cathode consisting of different commercial carbon materials, namely, acetylene black (SP), Ketjen Black (KB) and carbon nanotube (CNT), with sulfur (S) is prepared separately for Li-S battery. After the process of 8-h ball milling for KB/S composite, together with the polyvinyl pyrrolidone (PVP) binder, the cathode could …

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