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Investigation of Co3Mo and Co6Mo7 Binary Alloys as Electrocatalysts for Hydrogen Evolution Reaction in Acidic Media

preprint
submitted on 27.08.2020 and posted on 28.08.2020 by youyi sun, Alexey Ganin
Metal alloys have become ubiquitous choice as catalysts for electrochemical hydrogen evolution in alkaline media. However, scarce and expensive Pt remains the key electrocatalyst in acidic electrolytes making the search for earth-abundant and cheaper alternatives appealing. Herein, we present a facile and efficient synthetic route towards polycrystalline Co3Mo and Co6Mo7 metal alloys that achieve competitively low overpotentials of 115 mV and 160 mV at 10 mA cm–2 in 0.5 M H2SO4. Both alloys outperform Co and Mo metals which showed significantly higher overpotentials and lower current densities when tested under identical conditions. However, the low overpotential in Co3Mo comes at the price of stability. It rapidly becomes inactive when tested under applied potential bias. On the other hand, Co7Mo6 retains the current density over time without the evidence of current decay. The findings demonstrate that even in free-standing form and without nanostructuring polycrystalline bimetallic electrocatalysts could challenge the dominance of Pt in the acidic media if the ways for improving their stability were found.

History

Email Address of Submitting Author

alexey.ganin@glasgow.ac.uk

Institution

School of Chemistry, University of Glasgow

Country

United Kingdom

ORCID For Submitting Author

0000-0002-3754-5819

Declaration of Conflict of Interest

The authors declare no conflict of interests

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