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A review of negative electrode materials for electrochemical supercapacitors

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Science China(Technological Sciences) 2015年第11期58卷 1799-1808页

作者： LU XueFeng LI GaoRen tong yexiang MOE Laboratory of Bioinorganic and Synthetic Chemistry KLGHEI of Environment and Energy ChemistrySchool of Chemistry and Chemical Engineering Sun Yat-sen University

With increasing demands for clean and sustainable energy, the advantages of high power density, high efficiency, and long life expectancy have made supercapacitors one of the major emerging devices for electrochemical energy storage and power supply. However, one of the key challenges for SCs is their limited energy density, which has hindered their wider application in the field of energy storage. Despite significant progress has been achieved in the fabrication of high-energy density positive electrodes materials, negative electrode materials with high capacitance and a wide potential window are relatively less explored. In this review, we introduced some new negative electrode materials except for common carbon-based materials and what's more, based on our team's work recently, we put forward some new strategies to solve their inherent shortcoming as electrode material for SCs.

关键词： supercapacitors negative energy storage review

CoS_2 Yolk-Shell Spheres Coated with Carbon Thin Layers as High Active and Stable Electrocatalysts for Hydrogen Evolution Reaction

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第4期35卷 619-629页

作者： Wang Anliang tong yexiang Li Gaoren MOE Laboratory of Bioinorganic and Synthetic Chemistry The Key Lab of Low-Carbon Chemistry &Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-Sen University

Though water electrolysis is effective in generating high-quality hydrogen gas,it requires effective electrocatalysts for hydrogen evolution reaction(HER).CoS_2 have been considered as a promising HER electrocatalyst because of its high ctalytic ***,the key limitation for CoS_2 nanomaterial as HER electrocatalyst is its poor stability,which may be due to the structural breakdown of CoS_2 nanostructure or the evolution of S during H_2 evolution in acid *** porous carbon thin layer for protection from structural breakdown and evolution of S is a good way to improve catalytic *** addition,coating carbon layer can change electronic structure of CoS_2 for the moderated hydrogen adsorption energy,leading to enhanced catalytic ***,CoS_2 yolk-shell spheres coated with carbon thin layers exhibit superior catalytic performance for HER with low overpotential,small Tafel slope,and excellent stability.

关键词： CoS2@C yolk-shell sphere electrocatalyst hydrogen evolution reaction(HER) high stability

Electrodeposition of Rare Earth Metals and Their Alloys in Organic Electrolytes

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Journal of Rare Earths 1999年第2期17卷 72-75页

作者： Liu, Peng Yang, Qiqin Yang, Yansheng tong, yexiang Zhongshan Univ Guangzhou China

The electrodeposition of rare earth metals and their alloys in organic electrolytes are reviewed. The solvents, electrolytes and operetating conditions are discussed. It is concluded that exploring the rare earth salt, which can be highly soluble in organic solvents and easily dehydrated, is the key to the pracitical utilization of electrodeposition of rare earth metals and their alloys in organic electrolytes.

关键词： Rare earths Rare earthiron alloys Electrodeposition Organic electrolytes

Hollow Co_(2)P/Co-carbon-based hybrids for lithium storage with improved pseudocapacitance and water oxidation anodes

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Journal of Materials Science & Technology 2020年第20期52卷 203-211页

作者： Lei Hu Fuxin Wang M.-Sadeeq Balogun(Jie Tang) yexiang tong MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry The Key Lab of Low-Carbon Chemistry&Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China College of Materials Science and Engineering Hunan UniversityChangsha 410082HunanChina School of Applied Physics and Materials Wuyi UniversityJiangmen 529020China

A porous hollow hybrid nanoarchitecture that consist of Co2 P/Co nanoparticles confined in nitrogendoped carbon(NC) and carbon nanotube(CNT) hollow nanocubes(denoted as H-Co2 P/Co-NC/CNT) has been rational designed as anode for lithium ion batteries(LIBs) and electrocatalytic oxygen evolution reaction(OER).Such design involves simple synthetic process of using metal-organic frameworks(MOFs)as sacrificial *** uniform cubic-shaped H-Co2 P/Co-NC/CNT hybrid is investigated with several intriguing advantages,including improved structural integrity,superior electronic conductivity,hollow architecture and large specific surface area and so *** as-synthesized H-Co2 P/Co-NC/CNT displays excellent lithium storage behaviour in terms of long cycle life(> 500 cycles),remarkable rate performance(up to 5 A g^-1),high reversible capacity(601 mA hg^-1 at 0.2 A g^-1) and high pseudocapacitance ***,it also delivers a superior catalytic property for OER with a small Ta fel slope of 45.3 mV dec^-1 and overpotential of 256 mV(at 10 mA cm^-2).The excellent performance can be attributed to the synergistic effect between Co2 P/Co and NC/CNT,leading to enhanced conductivity through high pseudocapacitance *** present work demonstrates that MOF-derived H-Co2 P/Co-NC/CNT hybrid is a promising candidate for high-performance multifunctional energy systems.

关键词： Co-based hybrid Carbon-based hybrid Hollow morphology Lithium ion battery Oxygen evolution reaction

Preparation of Gd Co alloy in dimethylsulfoxide by electrodeposition method

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中国有色金属学会会刊：英文版 1999年第3期9卷 638-640页

作者： tong yexiang(童叶翔) Liu Guankun(刘冠昆) He Shan(何山) Wang Yu(王宇) Zhongshan Univ Sch Chem & Chem Engn Guangzhou 510275 Peoples R China

Electrodeposition of Gd Co alloy film from dimethylsulfoxide (DMSO) electrolyte solutions has been investigated using cyclic voltammogram and potentiostatic technique. Potentiostatic depositions between -1.20 V and -2.70 V were applied to uncomplexed and complexed solution. The deposits obtained at potentials within -2.30～-2.70 V from complexed solutions are silver gray smooth films.

关键词： Gd Co alloy electrodeposition dimethylsulfoxide

Construction of cobalt vacancies in cobalt telluride to induce fast ionic/electronic diffusion kinetics for lithium-ion half/full batteries

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Journal of Materials Science & Technology 2022年第32期127卷 124-132页

作者： Lei Hu Lin Li Yuyang Zhang Xiaohong Tan Hao Yang Xiaoming Lin yexiang tong Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application School of Chemical and Environmental EngineeringAnhui Polytechnic UniversityWuhu 241000China MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry The Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China Guangxi Key Laboratory of Electrochemical Energy Materials School of Chemistry&Chemical EngineeringGuangxi UniversityNanning 530004China Key Laboratory of Theoretical Chemistry of Environment Ministry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006China

Designing novel electrode materials with unique structures is of great significance for improving the performance of lithium ion batteries(LIBs).Herein,copper-doped Co_(1-x)Te@nitrogen-doped carbon hollow nanoboxes(Cu-Co_(1-x)Te@NC HNBs)have been fabricated by chemical etching of Cu Co-ZIF nanoboxes,followed by a successive high-temperature tellurization *** as-synthesized Cu-Co_(1-x)Te@NC HNBs composite demonstrated faster ionic and electronic diffusion kinetics than the pristine Co Te@NC HNBs *** existence of Co-vacancy promotes the reduction of Gibbs free energy change(ΔG_(H^(*)))and effectively improves the Li~+diffusion *** and theoretical calculations show that performance improvement is ascribed to the electronic interactions between Cu-Co_(1-x)Te and nitrogen-doped carbon(NC)that trigger the shift of the p-band towards facilitation of interfacial charge transfer,which in turn helps boost up the lithium storage ***,the proposed Cu-doping-induced Co-vacancy strategy can also be extended to other conversion-type cobalt-based material(CoSe_(2))in addition to asobtained Cu-Co_(1-x)Se_(2)@NC HNBs anodes for long-life and high-capacity *** importantly,the fabricated LiCoO_(2)//Cu-Co_(1-x)Te@NC HNBs full cell exhibits a high energy density of 403 Wh kg^(-1)and a power density of 6000 W kg^(-1).We show that the energy/power density reported herein is higher than that of previously studied cobalt-based anodes,indicating the potential application of Cu-Co_(1-x)Te@NC HNBs as a superior electrode material for LIBs.

关键词： MOF-derived material Cobalt telluride Cobalt vacancy Diffusion kinetics Lithium storage

A highly sensitive multiple-mode optical thermometer designed in Eu^(2+/3+)and Li^(+)co-doped polymorphism compound LaSc_(3)(BO_(3))_(4)

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Journal of Advanced Ceramics 2024年第6期13卷 821-833页

作者： Nan Yang Zhuo Li Tingxia Zhou Ziwang Zhang Wen Shi yexiang tong Jianxin Shi School of Chemistry IGCMESun Yat-sen UniversityGuangzhou 510006China MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry IGCMEThe Key Lab of Low-Carbon Chemistry&Energy Conservation of Guangdong ProvinceSun Yat-sen UniversityGuangzhou 510006China

Noncontact optical thermometers have attracted widespread attention,but existing problems such as single-mode and low-sensitivity thermometers still urgently need to be ***,a novel multiple-mode thermometer was designed for the polymorphism LaSc_(3)(BO_(3))_(4):Eu^(2+/3+),Li^(+).X-ray diffraction(XRD)patterns revealed a slight transition betweenα-andβ-phases with the concentrations of the dopants,which is further proved by structure refinements and first-principles *** coexistence of Eu^(2+)and Eu^(3+)in the phosphors and their relative percentages were confirmed by X-ray absorption near-edge structure(XANES)*** from appropriate emissions from Eu^(2+)and Eu^(3+)without obvious energy transfer and their opposite changing trends with temperatures under 307 nm excitation,a triple-mode optical thermometer is obtained for this material within the temperature range of 150–450 *** highest sensitivities of 27.65,14.05,and 7.68%·K^(−1)are achieved based on two fluorescence intensity ratio(FIR)modes of Eu^(2+)and Eu^(3+)(5d–4f/^(5)D_(0)–^(7)F_(2,4))and the fluorescence lifetime(FL)mode of Eu^(2+),*** the best of our knowledge,the former is almost the highest in Eu^(2+)and Eu^(3+)co-doped *** results indicate that this material may be used as an excellent multiple-mode optical thermometer.

关键词： phase transition europium(Eu)ions multiple-mode optical thermometer thermal quenching properties fluorescence intensity ratio(FIR) fluorescence lifetime(FL)

TiN Paper for Ultrafast-Charging Supercapacitors

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Nano-Micro Letters 2020年第1期12卷 27-39页

作者： Bin Yao Mingyang Li Jing Zhang Lei Zhang Yu Song Wang Xiao Andrea Cruz yexiang tong Yat Li Department of Chemistry and Biochemistry University of CaliforniaSanta CruzSanta CruzCA 95064USA KLGHEI of Environment and Energy Chemistry MOE of the Key Laboratory of Bioinorganic and Synthetic ChemistrySchool of Chemistry and Chemical EngineeringSun Yat-Sen UniversityGuangzhou 510275People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China

Ultrafast-charging energy storage devices are attractive for powering personal electronics and electric *** ultrafast-charging devices are made of carbonaceous materials such as chemically converted graphene and carbon ***,their relatively low electrical conductivity may restrict their performance at ultrahigh charging ***,we report the fabrication of a porous titanium nitride(TiN)paper as an alternative electrode material for ultrafast-charging *** TiN paper shows an excellent conductivity of 3.67×104 S m−1,which is considerably higher than most carbon-based *** paper-like structure also contains a combination of large pores between interconnected nanobelts and mesopores within the *** unique electrode enables fast charging by simultaneously providing efficient ion diffusion and electron *** supercapacitors(SCs)made of TiN paper enable charging/discharging at an ultrahigh scan rate of 100 V s−1 in a wide voltage window of 1.5 V in Na2SO4 neutral *** has an outstanding response time with a characteristic time constant of 4 ***,the TiN paper-based SCs also show zero capacitance loss after 200,000 cycles,which is much better than the stability performance reported for other metal nitride ***,the device shows great promise in *** filtration method enables good control of the thickness and mass loading of TiN electrodes and devices.

关键词： Ultrafast charging Wide voltage window TiN Paper-like electrode Supercapacitors

Supporting Information CoS2 Yolk-Shell Spheres Coated with Carbon Thin Layers as High Active and Stable Electrocatalysts for Hydrogen Evolution Reaction

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第4期35卷 744-747页

作者： Wang Anliang tong yexiang Li Gaoren MOE Laboratory of Bioinorganic and Synthetic Chemistry KLGHEI of Environment and Energy Chemistry School of Chemistry and Chemical Engineering Sun Yatsen University Guangzhou 510275 P.R. China

CoS2 spheres were synthesized according to the previous study reported by Lifang Jiao and her collabora tots. The details are listed as follow ing： 1.65 mmol of COC12 6H20 was dissolved in absolute ethanol and then was transferred into a 40 mL Teflon lined stainless steel autoclave, then 4.1 mmol of sulfur powder was added into above solution. The Teflon lined stainless steel auto was subsequently stirred for 30 min.

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