5 years ago

Boron-Dependency of Molybdenum Boride Electrocatalysts for the Hydrogen Evolution Reaction

Boron-Dependency of Molybdenum Boride Electrocatalysts for the Hydrogen Evolution Reaction
Hyounmyung Park, Andrew Encinas, Boniface P. T. Fokwa, Jan P. Scheifers, Yuemei Zhang
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, α-MoB, β-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 β-MoB show excellent activity in the same range as the recently reported α-MoB and β-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 β-MoB show long-term cycle stability in acidic solution. The more boron, the better: Two excellent and robust electrocatalysts for the hydrogen evolution reaction (HER), β-MoB and MoB2, have been discovered in the Mo-B system. Furthermore, as the boron content increases in the system, the catalytic performance of these borides also increases.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201611756

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