Facilitated water dissociation by coupling bimetallic phosphide with manganese oxide to enhance alkaline hydrogen evolution
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Abstract
Fabricating catalysts with efficient water dissociation and robust stability is key to advancing the industrialization of the alkaline hydrogen evolution reaction (HER). Establishing an effective phosphide/oxide interface is a feasible way to improve the HER performance of the catalyst in an alkaline medium, but it remains challenging. Here, we adopt that manganese oxide nanoparticles decorated on nickel-cobalt phosphide nanowire array on nickel foam (MnOx@NiCoP/NF) via a surface modification strategy that shifts the d-band center downward, promoting the water dissociation and hydrogen intermediate binding. Moreover, MnOx makes the surface of NiCoP rougher, facilitating bubble release and improving the array stability. Consequently, MnOx@NiCoP/NF achieves industrial current densities of 500 and 1000 mA·cm−2 with overpotentials of 171 and 193 mV, respectively, while maintaining stable operation for over 600 h at 1000 mA·cm−2 in 1 M KOH. Additionally, an anion exchange membrane electrolyzer with the catalyst was fabricated and shows potential for practical applications.
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References
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