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- Title
Mo<sub>x</sub>C/CNT Composites as Active Electrocatalysts for the Hydrogen Evolution Reaction under Alkaline Conditions.
- Authors
Yang, Fengkai; Sliozberg, Kirill; Antoni, Hendrik; Xia, Wei; Muhler, Martin
- Abstract
Low-cost electrocatalysts based on highly dispersed molybdenum carbide supported on carbon nanotubes (CNTs) were developed for the hydrogen evolution reaction (HER). The synthesis of MoxC/CNT was achieved by impregnation using ammonium heptamolybdate followed by a thermal treatment at 700 °C in CH4/H2, H2 or N2. The composites were characterized by X-ray diffraction, N2 physisorption, and X-ray photoelectron spectroscopy. β-Mo2C was the main Mo carbide phase generated in N2 or H2, whereas α-MoC was the dominant phase formed in CH4/H2. All the MoxC/CNT composites were catalytically active in the HER under alkaline conditions. The catalyst pretreated in pure H2 exhibited the highest HER activity, which was found to correlate with a higher amount of Mo2C, a higher total Mo content and a higher Mo surface concentration compared with the other two less active samples. Amorphous carbon on the surface seems to play an important role in limiting the HER performance of the Mo carbide catalysts, and the treatment in H2 removed it most effectively leading to high HER activity.
- Subjects
ELECTROCATALYSTS; MOLYBDENUM; CARBON nanotubes; HYDROGEN evolution reactions; ARTIFICIAL insemination
- Publication
Electroanalysis, 2016, Vol 28, Issue 10, p2293
- ISSN
1040-0397
- Publication type
Article
- DOI
10.1002/elan.201600269