期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 49, 页码 14723-14727出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201506727
关键词
electrocatalysis; graphene; hydrogen-evolution reaction; molybdenum carbide nanoparticles; water splitting
资金
- Shanghai Institute of Ceramics
- Key Project for Young Researchers of the State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Chinese Academy of Sciences
- National Natural Science Foundation of China [21307145]
- Shanghai Municipal Science and Technology Commission [15YF1413800]
- Shanghai Government [14DZ2261200]
The replacement of platinum with non-preciousmetal electrocatalysts with high efficiency and superior stability for the hydrogen-evolution reaction (HER) remains a great challenge. Herein, we report the one-step synthesis of uniform, ultrafine molybdenum carbide (Mo2C) nanoparticles (NPs) within a carbon matrix from inexpensive starting materials (dicyanamide and ammonium molybdate). The optimized catalyst consisting of Mo2C NPs with sizes lower than 3 nm encapsulated by ultrathin graphene shells (ca. 1-3 layers) showed superior HER activity in acidic media, with a very low onset potential of -6 mV, a small Tafel slope of 41 mVdec(-1), and a large exchange current density of 0.179 mAcm(-2), as well as good stability during operation for 12 h. These excellent properties are similar to those of state-of-the-art 20% Pt/C and make the catalyst one of the most active acid-stable electrocatalysts ever reported for HER.
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