期刊
CHEMICAL ENGINEERING JOURNAL
卷 432, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134329
关键词
ZnVOx -Co nanosheet; Heterostructure; Hydrogen evolution reaction; Metal doping; Amorphous structure
资金
- ZiQoo Chemical Co. Ltd., Japan
- State Scholarship Fund of China Scholarship Council, China
- MEXT of Japan for the scholarship, Japan
Designing cost-effective catalysts with high-activity and ultra-stability is crucial for scaling-up the water electrolysis process for hydrogen production. This study successfully synthesized Zn-VOx-Co 2D nanosheets with a well-integrated heterostructure, which showed enhanced intrinsic electrocatalytic activity and long-term stability. The dual-doping of Zn and VOx optimized the d-band center of Co and improved the adsorption and desorption of H, opening a new avenue for designing electrocatalysts with unique crystalline-amorphous heterostructure.
Designing cost-effective catalysts with high-activity and ultra-stability for hydrogen evolution reaction (HER) is important in the scaling-up of water electrolysis process for hydrogen production. Herein, a Zn-VOx-Co two-dimensional (2D) nanosheet with well-integrated heterostructure was successfully synthesized on carbon fiber paper (CFP) by a facile electrodeposition approach. Interestingly, the obtained nanosheets composed of amor-phous VOx-Co and Zn-Co crystalline phases with a heterostructure. Density functional theory (DFT) calculations reveled that the dual-doping of Zn and VOx optimized d-band center of Co and balanced adsorption and desorption of H, which enhanced intrinsic electrocatalytic HER activity. As a result, the optimum catalyst ach-ieved a current density of 10 mA cm(-2) at an overpotential as low as 46 mV and long-term electrochemical stability over 36 h in 1 M KOH solution. This work opens a new avenue for designing electrocatalysts with unique crystalline-amorphous heterostructure by dual-doping to achieve tunable surface properties as well as d-band structure.
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