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- Title
Ultrafine Molybdenum Carbide Nanoparticles Composited with Carbon as a Highly Active Hydrogen-Evolution Electrocatalyst.
- Authors
Ma, Ruguang; Zhou, Yao; Chen, Yongfang; Li, Pengxi; Liu, Qian; Wang, Jiacheng
- Abstract
The replacement of platinum with non-precious-metal 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 mV dec-1, and a large exchange current density of 0.179 mA cm-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.
- Subjects
NANOPARTICLES; ELECTROCATALYSTS; AMMONIUM molybdate; ELECTROLYSIS; GRAPHENE; WATER electrolysis
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 49, p14936
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201506727