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CeO2–x modified nimo alloy for alkaline hydrogen evolution reaction with high activity and stability
Ju-Hua Li1, Yong Tian1, Jia-Yi Chen1, Hong-Kai Guo, Wen-Hao Wang, Yu-Shu Han, He-Xuan Zhang, Xiao-Yu Zhang, Zhong-Li Wang*
https://doi.org/10.1016/j.cjsc.2026.101110
CeO2-x modification; NiMo alloy; Sol-gel; Water dissociation; Hydrogen evolution reaction
ABSTRACT
NiMo alloys are promising non-precious metal electrocatalysts for alkaline hydrogen evolution reaction (HER), however, they suffer from issues such as poor stability due to Mo leaching and insufficient intrinsic activity. In this study, a citric acid (CA) assisted CeO2-x modification strategy is developed to prepare a CeO2-x/NiMo alloy composite electrocatalyst with high activity and stability. CA is uniformly adsorbed onto the surface of CeO2 nanoparticles, and the cross-linked CA network with the CeO2 particles forms a uniformly dispersed nanoparticle sol, which acts as a special “glue” to uniformly adhere to the surface of the NiMoO4 precursor, forming a CeO2/NiMoO4 composite precursor. Following high-temperature reduction, a CeO2-x modified NiMo alloy electrocatalyst is synthesized. Owing to the strong interaction between CeO2-x and NiMo, the optimized composite electrocatalyst achieves a current density of 10 mA cm-2 at an overpotential of only 48 mV and it maintains high stability for over 1500 h at a current density of 500 mA cm-2, which is three times longer than that of the unmodified NiMo alloy electrocatalyst, outperforming most reported nickel-molybdenum-based electrocatalysts. In situ Raman spectra and density functional theory calculations indicate that the CeO2-x/NiMo alloy interface accelerates water dissociation, hydrogen combination and enhances alkaline HER performance. This work provides a new approach for the preparation of highly active and stable nickel-molybdenum-based hydrogen evolution catalysts.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1