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Electrode/Electrolyte Interfacial Chemistry Modulated by Chelating Effect for high-Performance Zinc Anode

Energy & Environmental Materials 2024年第3期7卷 93-99页

作者： Chuanlin Li Guangmeng Qu Xixi Zhang Chenggang Wang Xijin Xu School of Physics and Technology University of JinanJinan 250022China School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100China

Although Zn metal has been regarded as the most promising anode for aqueous batteries,its practical application is still restricted by side reactions and dendrite ***,an in-situ solid electrolyte interphase(SEI)film formed on the interface of electrode/electrolyte during the plating/stripping of zinc anodes by introducing trace amounts of multidentate ligand sodium diethyldithiocarbamate(DDTC)additive into 1 M ZnSO_(4).The synergistic effect of in-situ solid electrolyte interphase forming and chelate effect endows Zn^(2+)with uniform and rapid interface-diffusion kinetics against dendrite growth and surface side *** a result,the Zn anode in 1 M ZnSO_(4)+DDTC electrolytes displays an ultra-high coulombic efficiency of 99.5%and cycling stability(more than 2000 h),especially at high current density(more than 600 cycles at 40 mA cm^(-2)).Moreover,the Zn//MnO_(2)full cells in the ZnSO_(4)+DDTC electrolyte exhibit outstanding cyclic stability(with 98.6%capacity retention after 2000 cycles at 10 C).This electrode/electrolyte interfacial chemistry modulated strategy provides new insight into enhancing zinc anode stability for high-performance aqueous zinc batteries.

关键词： chelating effect in-situ SEI ultra-high current density Zn anodes

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Efficient electrocatalytic oxygen evolution at ultra-high current densities over 3D Fe,N doped Ni(OH)_(2) nanosheets

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Chinese Chemical Letters 2021年第3期32卷 1210-1214页

作者： Pu Shi Xiaodi Cheng Siliu Lyu Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China

Developing highly efficient nickel or iron based hydroxide electrocatalysts is primary essential but challenging for oxygen evolution reaction(OER)at ultra-high current ***,we developed a facile method to prepare nitrogen and iron doped nickel(Ⅱ)hydroxide nanosheets on self-supported conductive nickel foam(denoted as Fe,N-Ni(OH)_(2)/NF)through ammonia hydrothermal and impregnation *** to the optimization of the electronic structure by nitrogen doping and the strong synergistic effect between Fe and Ni(OH)_(2),the three-dimensional(3 D)Fe,N-Ni(OH)_(2)/NF nanosheets delivered superior electrocatalytic OER performances in basic solution with low potentials of 1.57 V and1.59 V under 500 mA/cm^(2)and 1000 mA/cm^(2)respectively and robust operation for 10 h with ignored activity decay,comparing well with the potentials of previously reported NiFe based electrocatalysts as well as the benchmark commercial Ir/C/***-situ Raman spectroscopy revealed that the main active species were NiOOH during the OER *** present results are expected to provide new insights into the study of OER process towards ultra-high current densities.

关键词： Vapor phase hydrothermal Nitrogen doped NiOOH Oxygen evolution reactio ultra-high current density

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