期刊
CHEMICAL ENGINEERING JOURNAL
卷 421, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127757
关键词
MON/Co4N heterostructures; H2O adsorption; H adsorption; Diffusion of H-ad; Hydrogen evolution reaction
资金
- National Natural Science Foundation of China [21972107]
- National Natural Science Foundation of Hubei Province [2020CFA095]
- National Natural Science Foundation of Jiangsu Province [BK20191186]
Research on enhancing the electrocatalytic performance of hydrogen evolution reaction in water electrolysis by using MoN/Co4N heterostructures has demonstrated outstanding performance and stability under varying pH conditions.
Searching for cost-effective electrocatalysts with remarkable catalytic activity and stability toward hydrogen evolution reaction (HER) under a wide range of pH values is highly desirable for the commercialization of water electrolysis. Herein, a facile strategy is reported to introduce MoN/Co4N heterostructures on Co4N nanosheets. Benefitting from the synergistic effect between the integrated heterostructure with tailored electronic structure and abundant active sites, the resultant MoN/Co4N exhibits superior catalytic performance and stability toward HER, with the overpotentials of 34, 44, and 72 mV to obtain the current density of 10 mA cm(-2) in alkaline, acidic, and neutral electrolytes, respectively. Combined with Density functional theory (DFT) calculations and experimental results, we find that the enhanced HER performance of MoN/Co4N is derived from the appropriately increased adsorption free energy of H2O, optimized adsorption free energy of hydrogen, as well as facilitated diffusion of Had and desorption of H-2.
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