Accelerated alkaline hydrogen evolution on M(OH) /M-MoPO (M = Ni, Co, Fe, Mn) electrocatalysts by coupling water
Lishan Peng1, Mansheng Liao1, Xingqun Zheng1
1The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, School of Chemistry and Chemical Engineering, Chongqing University Chongqing 400044 China zdwei@cqu.edu.cn liliracial@cqu.edu.cn.
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) /M-MoPO 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) /M-MoPO 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) and M-MoPO components in M(OH) /M-MoPO 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/NiMoPO catalyst exhibits excellent alkaline HER activity and durability, superior to the state-of-the-art Pt/C catalyst when the overpotential exceeds 65 mV.
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