Journal
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
Volume 341, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.123332
Keywords
Interstitial doping; Ni4Mo nanorod arrays; Mo dissolution; Anion-exchange membrane; Hydrogen evolution reaction
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A strategy of designing NiMo-based catalysts with interstitial boron doping is developed to achieve excellent alkaline HER performance. The catalyst shows comparable overpotential and turnover frequency to Pt/C and demonstrates good stability in an AEM electrolyzer.
Designing a strategy to make the intrinsic activity of NiMo-based catalysts while being able to achieve long-term stable hydrogen production at ampere-level current densities is important for their development in AEM elec-trolyzers. Herein, interstitial boron atom-doped Ni4Mo is designed to obtain the catalyst with excellent alkaline HER properties. B4.7-Ni4Mo/NF exhibits a small overpotential of 135.2 mV at 1000 mA cm-2 and a high turnover frequency (TOF) value of 6.14 s-1 at 100 mV in alkaline HER, which very close to that of Pt/C (6.86 s-1). The catalyst requires only 1.73 V to achieve a current density of 1.0 A cm-2 in AEM electrolyzer at 60 degrees C and is stable for 800 h. Experimental and theoretical calculations reveal that interstitial boron doping not only optimizes the electronic structure to optimize H* adsorption and promote the water dissociation but also inhibits the disso-lution of Mo by forming boron-metal bond.
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