Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 20, Pages 5575-5578Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201611756
Keywords
borides; electrolysis; hydrogen evolution reaction; molybdenum; X-ray photoelectron spectroscopy
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Funding
- UC Riverside
- NSF MRI program [DMR-0958796]
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Molybdenum-based materials have been considered as alternative catalysts to noble metals, such as platinum, for the hydrogen evolution reaction (HER). We have synthesized four binary bulk molybdenum borides Mo2B, alpha-MoB, beta-MoB, and MoB2 by arc-melting. All four phases were tested for their electrocatalytic activity (linear sweep voltammetry) and stability (cyclic voltammetry) with respect to the HER in acidic conditions. Three of these phases were studied for their HER activity and by X-ray photoelectron spectroscopy (XPS) for the first time; MoB2 and beta-MoB show excellent activity in the same range as the recently reported alpha-MoB and beta-Mo2C phases, while the molybdenum richest phase Mo2B show significantly lower HER activity, indicating a strong boron-dependency of these borides for the HER. In addition, MoB2 and beta-MoB show long-term cycle stability in acidic solution.
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