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Accelerated alkaline hydrogen evolution on M(OH)x/M-MoPOx (M = Ni, Co, Fe, Mn) electrocatalysts by coupling water dissociation and hydrogen ad-desorption steps† † Electronic supplementary information (ESI) available. See DOI: 10.1039/c9sc04603h

ABSTRACT: Developing efficient and cheap electrocatalysts for the alkaline hydrogen evolution reaction is still a big challenge due to the sluggish water dissociation kinetics as well as poor M–Had energetics. Herein, hydroxide modification and element incorporation have been demonstrated to realize a synergistic modulation on a new class of M(OH)x/M-MoPOx catalysts for accelerating water dissociation and hydrogen ad-desorption steps in the HER. Theoretical and experimental results disclosed that in situ modification with hydroxide endowed M(OH)x/M-MoPOx with a strong ability to dissociate water, and meanwhile, oxygen incorporation effectively optimized the M–Had energetics of the NiMoP catalyst. Moreover, the interaction between M(OH)x and M-MoPOx components in M(OH)x/M-MoPOx further enhances their ability to catalyze the two elementary steps in alkaline hydrogen evolution, providing a wide avenue for efficiently catalyzing hydrogen evolution. In general, the optimized Ni(OH)2/NiMoPOx catalyst exhibits excellent alkaline HER activity and durability, superior to the state-of-the-art Pt/C catalyst when the overpotential exceeds 65 mV. An efficient alkaline HER is realized on M(OH)x/M-MoPOx by accelerating water dissociation and hydrogen ad-desorption with the help of hydroxide modification and element incorporation.

SUBMITTER: Peng L

PROVIDER: S-EPMC8157449 | biostudies-literature |

REPOSITORIES: biostudies-literature

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