首页|Enhancing hydrogen evolution and oxidation kinetics through oxygen insertion into nickel lattice

Enhancing hydrogen evolution and oxidation kinetics through oxygen insertion into nickel lattice

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Nickel-based materials,including metallic Ni and Ni oxide,have been widely studied in the exploration of non-precious-metal hydrogen electrocatalysts,but neither pure Ni nor NiO is ideal for the hydrogen evo-lution reaction(HER)and hydrogen oxidation reaction(HOR).In this paper,an oxygen insertion strategy was applied on nickel to regulate its hydrogen electrocatalytic performance,and the oxygen-inserted nickel catalyst was successfully obtained with the assistance of tungsten dioxide support(denoted as O-Ni/WO2).The partial insertion of oxygen in Ni maintains the face-centered cubic arrangement of Ni atoms,simultaneously expanding the lattice and increasing the lattice spacing.Consequently,the adsorp-tion strength of*H and*OH on Ni is optimized,thus resulting in superior electrocatalytic performance of O-Ni/WO2 in alkaline HER/HOR.The Tafel slope of O-Ni/WO2@NF for HER is 56 mV dec-1,and the kinetic current density of O-Ni/WO2 for HOR reaches 4.85 mA cm-2,which is ahead of most currently reported catalysts.Our proposed strategy of inserting an appropriate amount of anions into the metal lattice could provide more possibilities for the design of high-performance catalysts.

Hydrogen evolutionHydrogen oxidationNickelOxygen insertionAdsorption free energy

Wanli Liang、Xiyu Gong、Jinchang Xu、Zixuan Dan、Fanyan Xie、Hulei Yu、Hao-Fan Wang、Yanshuo Jin、Hongjuan Wang、Yonghai Cao、Hui Meng、Hao Yu

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School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510641,Guangdong,China

Siyuan Laboratory,Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials,Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials,Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications,Department of Physics,Jinan University,Guangzhou 510632,Guangdong,China

GBA Branch of Aerospace Information Research Institute,Chinese Academy of Sciences,Guangzhou 510700,Guangdong,China

Instrumental Analysis & Research Center,Sun Yat-sen University,Guangzhou 510275,Guangdong,China

School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,Guangdong,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Guangdong ProvinceFundamental Research Funds for the Central Universities

2220904922075102220051202023A15150128042022ZYGXZR048

2024

10.1016/j.jechem.2024.03.057

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)