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The Synergistic Effects of Alloying on the Performance and Stability of Co3Mo and Co7Mo6 for the Electrocatalytic Hydrogen Evolution Reaction

School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK
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Hydrogen 2020, 1(1), 11-21; https://doi.org/10.3390/hydrogen1010002
Received: 27 August 2020 / Revised: 5 October 2020 / Accepted: 8 October 2020 / Published: 10 October 2020
Metal alloys have become a 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 important. Herein, we present a facile and efficient synthetic route towards polycrystalline Co3Mo and Co7Mo6 alloys. The single-phased nature of the alloys is confirmed by X-ray diffraction and electron microscopy. When electrochemically tested, they achieve competitively low overpotentials of 115 mV (Co3Mo) and 160 mV (Co7Mo6) at 10 mA cm−2 in 0.5 M H2SO4, and 120 mV (Co3Mo) and 160 mV (Co7Mo6) at 10 mA cm−2 in 1 M KOH. Both alloys outperform Co and Mo metals, which showed significantly higher overpotentials and lower current densities when tested under identical conditions, confirming the synergistic effect of the alloying. 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 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 acidic media if ways for improving their stability were found. View Full-Text
Keywords: hydrogen evolution reaction; metal alloys; water electrolysis; acidic conditions hydrogen evolution reaction; metal alloys; water electrolysis; acidic conditions
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MDPI and ACS Style

Sun, Y.; Ganin, A.Y. The Synergistic Effects of Alloying on the Performance and Stability of Co3Mo and Co7Mo6 for the Electrocatalytic Hydrogen Evolution Reaction. Hydrogen 2020, 1, 11-21. https://doi.org/10.3390/hydrogen1010002

AMA Style

Sun Y, Ganin AY. The Synergistic Effects of Alloying on the Performance and Stability of Co3Mo and Co7Mo6 for the Electrocatalytic Hydrogen Evolution Reaction. Hydrogen. 2020; 1(1):11-21. https://doi.org/10.3390/hydrogen1010002

Chicago/Turabian Style

Sun, Youyi, and Alexey Y. Ganin 2020. "The Synergistic Effects of Alloying on the Performance and Stability of Co3Mo and Co7Mo6 for the Electrocatalytic Hydrogen Evolution Reaction" Hydrogen 1, no. 1: 11-21. https://doi.org/10.3390/hydrogen1010002

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