期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 69, 页码 29730-29740出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.06.280
关键词
Phosphomolybdic acid; Molybdenum carbide; Heteroatomic doping; Graphene; Electrocatalytic hydrogen evolution
资金
- Shanxi Scholarship Council of China [2021-121]
- Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province [20200004]
A ternary phosphomolybdic acid-polyethyleneimine/graphene oxide nanocomposite was developed as a precursor for the controllable growth of molybdenum carbide nanostructure on graphene and the doping of N and P atoms. The hybrid exhibited remarkable electrocatalytic activity and high stability for hydrogen evolution reaction, making it a promising electrocatalyst.
Based on the ever-growing interest of heteroatoms (e.g., P, N, S, transition metals) doping into molybdenum carbide and graphene for electrochemical reactions, herein, a ternary phosphomolybdic acid-polyethyleneimine/graphene oxide nanocomposite as a suitable precursor was developed to not only uniformly hybridize molybdenum and carbon source to perform the controllable in situ growth of well-defined molybdenum carbide nanostructure on graphene by annealing, but also synchronously dope N and P atoms into molybdenum carbide crystal lattice and graphene. The as-prepared hybrid showed remarkable electrocatalytic activity and high stability for hydrogen evolution reaction in basic media, due to the following favorable features, i.e. a large accessible active sites afforded by the ultrafine molybdenum carbide, the heteroatoms doped, the regulated electronic structure, the balanced thermodynamics between hydrogen adsorption and desorption, the accelerated charge/mass transfer ability by the ultrathin and defective carbon layer, and the protection of molybdenum carbide by carbon layer. As a result, it only needed a small overpotential of 47 mV to drive 10 mA cm(-2) and a low onset potential of 10 mV, as well as a small Tafel slope of 56.8 mV center dot dec(-1), thus suggesting its promising potential for hydrogen evolution electrocatalyst. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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