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Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density

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Journal of Materials Science & Technology 2024年第4期171卷 16-23页

作者： Zhijia Zhang Gang Xie Yuefang chen Yanhao Wei Mengmeng Zhang Shulei chou Yunxiao Wang Yifang Zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Carbon nanofibers(CNFs)with high specific surface area show great potential for sodium storage as a hard carbon ***,CNFs anchored with Ni nanoparticles(CNFs/Ni)were prepared through chemical vapor deposition and impregnation reduction methods,in situ growing on the three-dimensional porous copper current collector(3DP-Cu).The coupling effect of high-spin state Ni nanopar-ticles leads to the increase of defect density and the expansion of lattice spacing of ***,the 3DP-Cu ensures a high loading capacity of CNFs and short ion/electron transport *** an integral binder-free anode,the 3DP-Cu/CNFs/Ni exhibits excellent electrochemical performance,which demon-strates a high specific capacity with 298.5 mAh g^(-1)at 1000 mA g^(-1)after 1500 cycles,and a high power density with 200 mAh g^(-1)over 1000 cycles at 5000 mA g^(-1).Density functional theory calculation re-sults show that the high-spin state Ni regulates the electronic structure of CNFs,which significantly reduces the adsorption energy for Na^(+)(-2.7 Ev)and thus enables high-rate *** regulation of the electronic structure of carbon materials by high-spin state metal provides a new strategy for developing high-power carbonaceous anode materials for sodium-ion batteries.

关键词： Carbon nanofibers Ni nanoparticles High-spin state Sodium-ion batteries Anode materials Density functional theory calculation

The modulation of the discharge plateau of benzoquinone for sodium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1675-1683页

作者： Feng-hua chen Yi-wen Wu Huan-hong Zhang Zhan-tu Long Xiao-xin Lin Ming-zhe chen Qing chen Yi-fan Luo Shu-Lei chou Rong-hua Zeng Key Laboratory of Theoretical Chemistry of the Environment Ministry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusSquires WayNorth WollongongNSW 2522Australia Department of Mechanical and Aerospace Engineering and Department of ChemistryThe Hong Kong University of Science and TechnologyHong KongChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

p-Benzoquinone(BQ)is a promising candidate for next-generation sodium-ion batteries(SIBs)because of its high theoretical specific capacity,good reaction reversibility,and high resource ***,practical application of BQ faces many challenges,such as a low discharge plateau(~2.7 V)as cathode material or a high discharge plateau as anode material compared with inorganic materials for SIBs and high solubility in organic electrolytes,resulting in low power and energy ***,tetrahydroxybenzoquinone tetrasodium salt(Na_(4)C_(6)O_(6))is synthesized through a simple neutralization reaction at low *** four-ONa electron-donating groups introduced on the structure of BQ greatly lower the discharge plateau by over 1.4 V from ~2.70 V to ~1.26 V,which can change BQ from cathode to anode material for *** the same time,the addition of four-ONa hydrophilic groups inhibits the dissolution of BQ in the organic electrolyte to a certain *** a result,Na_(4)C_(6)O_(6) as the anode displays a moderate discharge capacity and cycling performance at an average work voltage of ~1.26 V versus Na/Na^(+).When evaluated as a Na-ion full cell(NIFC),a Na_(3)V_(2)(PO_(4))_(3)||Na_(4)C_(6)O_(6) NIFC reveals a moderate discharge capacity and an average discharge plateau of ~1.4 *** research offers a new molecular structure design strategy for reducing the discharge plateau and simultaneously restraining the dissolution of organic electrode materials.

关键词： discharge plateau electron-donating groups dissolution sodium-ion batteries

Effect of Ni/Fe ratio on activation sintering and mechanical properties of molybdenum nickel iron alloy

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Journal of Central South University 2022年第5期29卷 1423-1436页

作者： LIU Jun-ru LI Zhi-bo chen Ben chou kuo-chih ZHANG Guo-hua State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In order to improve the low ductility of the Mo-Ni alloy,Fe is added and the effects of Ni/Fe mass ratio on the densification behavior,microstructure evolution and mechanical properties of alloy were *** experimental results show that when iron is added to 95Mo-5Ni alloy,the formation of brittle intermetallic phaseδ-MoNi at the grain boundary is ***,the grain growth of Mo is also effectively inhibited in the sintering ***,the addition of iron reduces the degree of densification of alloy since the activation effect of Ni is superior to that of *** the experimental results,it could be concluded that the maximum hardness and bending strength are achieved by 95Mo-1.5Ni-3.5Fe alloy,which are HV 614 and 741 MPa,*** with the analyses of bending fracture mechanism,the improvement relative to Mo-Ni alloy is likely attributed to the inhibition of the brittle phase.

关键词： Mo-Ni-Fe alloy sintering behavior brittle phase densification

Study on fish life history traits and variation in the Taiwan Strait and its adjacent waters

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Acta Oceanologica Sinica 2015年第2期34卷 45-54页

作者： HU Wenjia YE Guanqiong LU Zhenbin DU Jianguo chen Mingru chou Loke Ming YANG Shengyun Department of Oceanography Xiamen University The Third Institute of Oceanography State Oceanic Administration Tropical Marine Science Institute National University of Singapore Ocean College Zhejiang University Fisheries Research Institute of Fujian

Large portions of the world＇s fishery resources are overexploited. Life history traits of fish species are important indicators to reveal different life history strategies and to indicate population responses to fishing pressures. For this study, empirical data on fishing grounds located in the coastal area between Fujian Coast and Taiwan Island were collected. These areas have experienced severe overfishing in the past 30 years, leading to changes in the structure and function of the fish communities. Fifty-one commercial fish species in this fishing ground were selected to study the life history traits. Using the life history traits, all the species were grouped into five different life history strategies by principle component analysis. More than 60% of the species were categorized in Group 5 that was similar to r-strategists. Twenty-five commercial species were selected for further analysis of changes in life history variables, and to discuss the population responses to exploitation. Results showed that most of the species appeared to become smaller size, shorter life, earlier maturation and faster growing under long-term exploitation. The exploitation rate of each species was also calculated to further discuss the impacts of fishing pressures to fish populations. Four species were found with the severest changes on life history traits indicating some of the species might be more susceptible to exploitation. This study on fish life history traits and their long-term variations under fishing pressures could provide important scientific implications for fishery management and conservation.

关键词： life history traits fish life history strategy fishery exploitation the Taiwan Strait

Extended Gate Field Effect Transistor Based Measuring of the Vitamin C content of Orange Juice

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稀有金属材料与工程 2006年第A03期35卷 342-343页

作者： Jung-Chuan chou Department of Electronic Engineering National Yunlin University of Science and TechnologyDouliouTaiwan 640China

An extended-gate field effect transistor (EGFET)of SnO_2/ITO glass was applied to manufacture the vitamin C ***,we immobilized the ascorbate oxidase with 3-glycidoxypropyltrimethoxysilane (GPTS)method to measure the different concentrations of the vitamin C solution in an optimum measurement *** order to find the best measurement conditions of the biosensor,we studied the vitamin C sensor in different pH values of the phosphate buffer solution (PBS).Additionally,we used experimental results to discuss the response time and response voltage to compare vitamin C with orange juice for the vitamin C sensor.

关键词： orange juice extended-gate field effect transistor SnO2/ITO glass vitamin C sensor

Fabrication of the Sodium Ions Extended Gate Field Effect Transistor by Using the Entrapment Method

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稀有金属材料与工程 2006年第A03期35卷 246-247页

作者： Jung-Chuan chou Department of Electronic Engineering National Yunlin University of Science and TechnologyDouliouTaiwan 640China

The sodium ion is necessary in physiological function and an important element in blood of human body,because the concentration of the sodium ion in the blood directly affects the functions of some organs or pathological feature,how to detect it is an important *** this paper,we measure the concentration of sodium ions by the extended gate field effect transistor (EGFET).We use three different substrates RuO_x/p-Si,ITO glass,SnO_2/ITO to fabricate EGFET,and we choose the optimum *** fabrication of device needed to use the entrapment method.

关键词： sodium ion extended gate field effect transistor(EGFET) entrapment method

Simultaneous determination of manufacturer’s process mean and production run length,and retailer’s order quantity

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Journal of Management Analytics 2016年第1期3卷 59-79页

作者： Chung-Ho chen Chao-Yu chou Chao-Chin Kan Department of Management and Information Technology Southern Taiwan University of Science and TechnologyTainan Department of Finance National Taichung University of Science and TechnologyTaichung

In chen and Liu’s optimum profit model with a traditional production system,they did not consider the effect of product quality on the customer’s demand order quantity,and also ignored the used cost of customers for *** fact,the customer’s demand quantity is always seriously related to product ***,in the present paper,we modify chen and Liu’s model to address the determination of the optimal process parameters by employing the idea of quality loss and single sampling rectifying inspection *** that the quality characteristic of the product is normally distributed,Taguchi’s symmetric quadratic quality loss function is applied in evaluating the product *** decision variables,i.e.,the mean of the process characteristic,the production run length of the product and the retailer’s order quantity,are jointly determined in our modified model to maximize the expected total profit of society,which includes both the manufacturer and the retailer.A heuristic solution procedure is developed for this optimization problem,and a numerical example is provided for *** the numerical results,it can be seen that both the sale price per unit and the intercept of the mean demand of the customer are two major(or significant)parameters in the model and should be more accurately estimated in ***,the quality investment policy is provided to compare its effect on the optimum profit model with quality improvement.

关键词： economic order quantity process mean production run length Taguchi’s quadratic quality loss function quality investment

Calculation of physicochemical properties in molten melts

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Calculation of physicochemical properties in molten melts

Preparation and oxidation characteristics of ZrC-ZrB2 composite powders with different proportions

Ninth International Conference on Molten Slags,Fluxes and Salts(MOLTEN12)

作者： kuo-Chih chou School of Metallurgical ＆ Ecological Engineering University of Science and Technology Beijing School of Materials Science ＆ Engineering

The physicochemical properties of melts are very important for controlling metallurgical processes and designing new ***,it is difficult to obtain them in terms of the experiments due to the system studied with higher melting temperature,under corrosion environment and with a larger number of ***,most of physicochemical data came from theoretical calculation in the light of very limited experiment *** theoretical calculation can be classified into three categories:physical model,empirical model as well as semi-empirical and semi-theoretical model,among which the last one is most popular and has provided most part of data required by research and industrial *** this report,the progresses of semi-empirical and semi-theoretical model in China have been summarized,that can further be divided into three types of methods:（i） geometrical model,（ii） semi-empiric model（computing the system property based on the melts structure information） and（iii） the model correlating two different kinds of properties,as a result one can calculate one physicochemical property based on another *** the geometric model,the stress will be put on our new generation model that has been demonstrated more reasonable and accurate than that of the traditional geometric model in terms of a statistical thermodynamic analysis and practical calculating *** significance of the third method,*** relation between two different physicochemical properties has been ***,the advantages and disadvantages of these three methods have also been compared that will be beneficial for the model selection and model developing for high temperature molten systems.

关键词： Molten melts physicochemical properties solution model

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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 521-528页

作者： Yu Wang Guohua Zhang kuochih chou State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

ZrC and ZrB2 are both typical ultra-high temperature ceramics,which can be used in the hyperthermal *** this study,a method for preparing ultrafine ZrC-ZrB2 composite powder was provided,by using the raw materials of nano ZrO2,carbon black,B4C,and metallic *** is worth pointing out that ZrC-ZrB2 composite powder with any proportion of ZrC to ZrB2 could be synthesized by this ***,a mixture of ZrC and C was prepared by carbothermal reduction of *** adjusting the addition amount of B4C,ZrC was boronized by B4C to generate ZrC-ZrB2 composite powder with different *** this method,five composite powders with different molar ratios of ZrC and ZrB2(100ZrC,75ZrC-25ZrB2,50ZrC-50ZrB2,25ZrC-75ZrB2,and 100ZrB2)were *** the temperature of boronization and decarburization process was 1473 K,the particle size of product was only tens of ***,the oxidation charac-teristics of different composite powders were investigated through oxidation *** oxidation resistance of ZrC-ZrB2 composite powder continued to increase as the content of ZrB2 increased.

关键词： borides carbides core-shell structures powders ultra-high temperature ceramic