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The bond evolution mechanism of covalent sulfurized carbon during electrochemical sodium storage process

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Science China Materials 2019年第8期62卷 1127-1138页

作者： Tianjing Wu Chenyang Zhang Guoqiang Zou Jiugang Hu Limin Zhu Xiaoyu Cao Hongshuai Hou Xiaobo Ji Key Laboratory of Powder Metallurgy College of Chemistry and Chemical Engineering Central South University Changsha 410083 China College of Chemistry Henan University of Technology Zhengzhou 450001 China

The excellent energy storage performance of covalent sulfur-carbon material has gradually attracted great interest. However, in the electrochemical sodium storage process, the bond evolution mechanism remains an elusive topic. Herein, we develop a one-step annealing strategy to achieve a high covalent sulfur-carbon bridged hybrid(HCSC)utilizing phenylphosphinic acid as the carbon-source/catalyst and sodium sulfate as the sulfur-precursor/salt template, in which the sulfur mainly exists in the forms of C–S–C and C–S–S–C. Notably, most of the bridge bonds are electrochemically cleaved when the cycling voltage is lower than0.6 V versus Na/Na+, leading to the appearance of two visible redox peaks in the following cyclic voltammogram(CV) *** in-situ and ex-situ characterizations demonstrate that S^2- is formed in the reduction process and the carbon skeleton is concomitantly and irreversibly isomerized. Thus, the cleaved sulfur and isomerized carbon could jointly contribute to the sodium storage in 0.01–3.0 V. In a Na-S battery system, the activated HCSC in cut off voltage window of 0.6–2.8 V achieves a high reversible capacity(770 mA h g^-1 at 300 mA g^-1). This insight reveals the charge storage mechanism of sulfur-carbon bridged hybrid and provides an improved enlightenment on the interfacial chemistry of electrode materials.

关键词： one-step method sulfur-carbon bridged complex electrochemical mechanism sodium storage

Galena-pyrolusite co-extraction in sodium chloride solution and its electrochemical analysis

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Transactions of Nonferrous Metals Society of China 2010年第5期20卷 897-902页

作者：龙怀中柴立元覃文庆 School of Metallurgical Science and Engineering Central South University School of Minerals Processing and Bioengineering Central South University

The co-extraction behavior of galena-pyrolusite in a sodium chloride solution and the electrochemical mechanism of this process were investigated,and some factors affecting the leaching rate of Pb and Mn were *** results show that all the factors such as the concentration of NaCl,HCl and pyrolusite ore,reaction time,temperature,adding times of HCl,affect the leaching rate of *** main affecting factors are the concentration of NaCl,reaction time and *** Tafel polarization curves and EIS plots of the galena and pyrolusite in the NaCl solution demonstrate that during the oxidation process of galena mineral electrode,film forms on the galena surface,which prevents galena from deeper ***,the film resistance can be greatly reduced in the presence of sodium chloride,thus promoting the reaction rate of galena.

关键词： galena pyrolusite co-extraction behavior electrochemical mechanism

Microstructure optimization and electrochemical behavior of in-situ growth Ramsdellite-MnO_(2)@NCA-LDH@CC for supercapacitors and oxygen evolution reaction catalysts

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Journal of Materiomics 2024年第3期10卷 552-565页

作者： Xinpeng Huang Yanli Li Xuehua Yan Feng Zhang Chu Chu Jili Wu Jianmei Pan Zohreh Shahnavaz Jamile Mohammadi Moradian School of Materials Science and Engineering Jiangsu UniversityZhenjiang212013JiangsuChina Institute for Advanced Materials Jiangsu UniversityZhenjiang212013JiangsuChina

Supercapacitors are electrochemical energy storage devices with great potential ***-while,the oxygen evolution reaction(OER)determines the efficiency of some electrochemical energy *** study aims at constructing,exploring,and optimizing Ramsdellite-MnO_(2)@NiCoAl-LDH@CC(R-MNCA@CC)*** effect of microstructure and Al role on the performance is investigated when R-MNCA@CC was used as supercapacitor electrode material and OER ***-like R-MNCA@CC in-situ growth composites were synthesized by a two-step hydrothermal method.R-MNCA@CC-2(molar ratio of Ni:Co:Al is 1:1:1)performs the best with the largest specific capacitance,1,742 F/g at 1 A/g,increased by 797%and 1,489%compared to that of NiCoAl-LDH and Ramsdellite-MnO_(2).The capacitance retention rate of the R-MNCA@CC-2//AC@CC supercapacitor is 80.1%after 5,000 cycles at 0.8 A/*** overpotential for driving an OER to reach 10 m/cm^(2)is only 276 mV,which is lower than that of commercial IrO_(2)(300 mV).Noteworthy,we propose a view that is“competing to trigger redox re-action”of electrochemical active sites in LDH during electrochemical processes derived from a discrepancy between theory and experimental results.

关键词： Supercapacitors Oxygen evolution reaction MnO_(2)@NiCoAl-LDH composites Microstructure optimization electrochemical mechanism

A new insight into electrochemical detection of eugenol by hierarchical sheaf-like mesoporous NiCo2O4

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Nano Research 2015年第8期8卷 2636-2645页

作者： Mylamparambil Udayan Anu Prathap Chao Wei Shengnan Sun Zhichuan J. Xu School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

NiCo2O4 nanosheets with sheaf-like nanostructure morphologies have been synthesized by a facile one-step hydrothermal reaction followed by annealing treatment. Impressively, the NiCo2O4 nanosheets exhibit rapid detection of eugenol. The linear range of detection is from 1-500μM, and the limit of detection is 5.4 μM. The NiCo2O4 modified electrode demonstrated high sensitivity, good repeatability and reproducibility, and long-term stability （7% decrease in response over 30 days）. Based on this work, an electrochemical reaction mechanism for eugenol oxidation was proposed, and in addition, the NiCo2O4 modified electrode was successfully employed for the analysis of eugenol in medicative balm samples. Recovery values for eugenol in medicative balm samples were in the range 98.7%-105.5%.

关键词： NiCo2O4 nanosheets eugenol determination electrocatalysis electrochemical mechanism real sample analysis

Scalable synthesized high-performance TiO_(2)-Si-C hybrid anode for lithium batteries

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Journal of Energy Chemistry 2023年第2期77卷 348-358,I0009页

作者： Liao Shen Chengjie Xu Jingguo Gao Jianming Tao Qiaobao Zhang Yue Chen Yingbin Lin Zhigao Huang Jiaxin Li College of Physics and Energy Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research CenterFujian Normal UniversityFuzhou 350117FujianChina Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials Fuzhou 350117FujianChina Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117FujianChina Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina

At present,developing a simple strategy to effectively solve the shackles of volume expansion,poor conductivity and interface compatibility faced by Si-C anode in lithium batteries(LIBs)is the key to its ***,low-cost nano-Si powders were prepared from Si-waste of solar-cells by sanding treatment,which can effectively reduce the commercialization cost for Si-C ***,micro-nano structured Gr@Si/C/TiO_(2) anode materials with graphite(Gr)as the inner core,TiO_(2)-doped and carbon-coated Si as the outer coating-layer,were synthesized at kilogram-scale per milling *** characterization results indicate that TiO_(2)-doped carbon layer can improve the interface compatibility with the electrolyte,further promote the reduction of electrode polarization,and finally enhance the battery performance for the Gr@Si/C/TiO_(2) ***,Gr@Si/C/TiO_(2) composites can output excellent LIB performance,especially with high initial coulombic efficiency(ICE)of 82.51%and large average reversible capacity of~810 mA h g^(-1) at 0.8 A g^(-1) after 1000 ***,Gr@Si/C/TiO_(2)‖NCM811 pouch full cells deliver impressive performance especially with high energy density of~489.3 W h kg^(-1) based on the total weight of active materials,suggesting its promising application in the high performance LIBs.

关键词： Lithium-ion batteries Si-C anodes Kilogram-scale preparation Interface compatibility electrochemical mechanism

Review and prospects on the low-voltage Na_(2)Ti_(3)O_(7) anode materials for sodium-ion batteries

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Journal of Energy Chemistry 2024年第1期88卷 446-460,I0011页

作者： Jun Dong Yalong Jiang Ruxing Wang Qiulong Wei Qinyou An Xiaoxing Zhang Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of TechnologyWuhan 430068HubeiChina State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200HubeiChina Xiamen Key Laboratory of High-Performance Metals and Materials College of MaterialsXiamen UniversityXiamen 361005FujianChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Due to its low cost and natural abundance of sodium,Na-ion batteries(NIBs)are promising candidates for large-scale energy storage *** development of ultralow voltage anode materials is of great significance in improving the energy density of ***-voltage anode materials,however,are severely lacking in *** all the reported insertion oxides anodes,the Na_(2)Ti_(3)O_(7) has the lowest operating voltage(an average potential of 0.3 V ***^(+)/Na)and is less likely to deposit sodium,which has excellent potential for achieving NIBs with high energy densities and high *** significant progress has been made,achieving Na_(2)Ti_(3)O_(7) electrodes with excellent performance remains a severe *** paper systematically summarizes and discusses the physicochemical properties and synthesis methods of Na_(2)Ti_(3)O_(7).Then,the sodium storage mechanisms,key issues and challenges,and the optimization strategies for the electrochemical performance of Na_(2)Ti_(3)O_(7) are classified and further ***,remaining challenges and future research directions on the Na_(2)Ti_(3)O_(7) anode are *** review offers insights into the design of high-energy and high-safety NIBs.

关键词： Sodium-ion batteries Low-voltage anode materials Na_(2)Ti_(3)O_(7) electrochemical performances electrochemical mechanism

Decoding lithium batteries through advanced in situ characterization techniques

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International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 965-989页

作者： Mei Yang Ruyi Bi Jiangyan Wang Ranbo Yu Dan Wang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 10049China Department of Energy Storage Science and Engineering School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Given the energy demands of the electromobility market,the energy density and safety of lithium batteries(LBs)need to be improved,whereas its cost needs to be *** the enhanced performance and decreased cost,more suitable electrode and electrolyte materials should be developed based on the improved understanding of the degradation mechanisms and structure–performance correlation in the LB ***,various in situ characterization technologies have been developed during the past decades,providing abundant guidelines on the design of electrode and electrolyte *** we first review the progress of in situ characterization of LBs and emphasize the feature of the multi-model coupling of different characterization ***,we systematically discuss how in situ characterization technologies reveal the electrochemical processes and fundamental mechanisms of different electrode systems based on representative electrode materials and electrolyte ***,we discuss the current challenges,future opportunities,and possible directions to promote in situ characterization technologies for further improvement of the battery performance.

关键词： in situ characterization techniques multi-modal coupling lithium batteries electrochemical mechanism

NaV6O15:A promising cathode material for insertion/extraction of Mg^2+with excellent cycling performance

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Nano Research 2020年第2期13卷 335-343页

作者： Dongzheng Wu Jing Zeng Haiming Hua Junnan Wu Yang Yang Jinbao Zhao Collaborative Imnovation Center of Chemistry for Energy Materials State Key Lab of Physical Chemistry of Solid SurfacesState Province Joint Engineering Laboratory of Power Source Technology for New Energy VehicleEngineering Research Center of Electrochemical TechnologyMinistry of EducationCollege of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China

The rechargeable magnesium batteries(RMBs)are getting more and more attention because of their high-energy density,high-security and ***,the high charge density of Mg^2+makes the diffusion of Mg2+in the conventional cathodes very slow,resulting in a lack of appropriate electrode materials for *** this work,we enlarge the layer spacing of V2Os by introducing Na^2+in the crystal structure to promote the diffusion kinetics of Mg^2+.The NaVeO15(NVO)synthesized by a facile method is studied as a cathode material for RMBs with the anhydrous pure Mg^2+*** a result,the NVO not only exhibits high discharge capacity(119.2 mAh:g^-1 after 100 cycles at the current density of 20 mA:g^-1)and working voltage(above 1.6 V ***^2+/Mg),but also expresses good rate ***,the eX-situ characterizations results reveal that the Mg^2+storage mechanism in NVO is based on the intercalation and *** density functional theory(DFT)calculation results further indicate that Mg^2+tends to occupy the semi-occupied sites of Na^+in the ***,the galvanostatic intermittent titration technique(GITT)demonstrates that NVO electrode has the fast diffusion kinetics of Mg^2+during discharge process ranging from 7.55×10^-13 to2.41×10^-11 cm^2·s^-*** work proves that the NVO is a potential cathode material for RMBs.

关键词： NaV6O15 alkali metal pre-intercalation rechargeable magnesium battery cathode electrochemical mechanism

Corrosion inhibiting performance and mechanism of protic ionic liquids as green brass inhibitors in nitric acid

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Green Energy & Environment 2020年第2期5卷 214-222页

作者： Pengcheng Hu Zhitao Wu Junlin Wang Yuqing Huang Quanyou Liu Shu-Feng Zhou College of Chemical Engineering Huaqiao UniversityNo.668 Jimei AvenueJimei DisrtictXiamen CityFujian Province361021China

Four protic ionic liquids(ILs)were synthesized via a one-step method by using benzotriazole(BTA)and benzimidazole as cations,and benzenesulfonic acid and 2-naphthalenesulfonic acid(NSA)as *** ILs were used as green corrosion inhibitors for brass specimens in a nitric acid *** structure of the protic ILs was characterized by 1H-NMR,13C-NMR,and FT-IR *** effects of the IL structure,IL concentration,acid concentration,and corrosion time on the surface morphology of brass specimens and the inhibition efficiency(η%)of ILs were investigated by the weight loss method combined with SEM and EDS *** curves and impedance spectroscopy were used to analyze the electrochemical corrosion inhibition mechanism of *** showed that IL synthesis was a proton transfer process,and the proton of the–SO3H group on NSA was deprived by ***[BTA][NSA],which had a high charge density and large conjugateπband,was the most effective inhibitor for brass ***η%of[BTA][NSA]decreased with the increase in acid concentration and corrosion time,which showed an increment with the increase in[BTA][NSA]*** higher theη%of[BTA][NSA]is,the smoother the surface of the brass specimens is,and the smaller the undistributed area of Cu element will *** inhibiting mechanism from electrochemical analysis indicated that the addition of[BTA][NSA]increased the polarization resistance of the brass electrode significantly and suppressed both anodic and cathodic reactions.

关键词： Protic ionic liquid Corrosion inhibitor electrochemical mechanism Brass