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CeO2-Stabilized Ni4Mo Alloys as Robust Alkaline Hydrogen-Evolving Electrocatalysts for Anion Exchange Membrane Water
Yao Ren Mo1, Fang Xin Mao1, Ya Ni Chen1
1Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Abstract:
The ampere-level alkaline hydrogen evolution reaction (HER) requires catalysts that combine high activity with long-term stability, yet benchmark NiMo alloys suffer from severe Mo leaching during operation. Here, we report a surface passivation strategy using CeO2-stabilized Ni4Mo alloys on MoO2 (CeO2-Ni4Mo/MoO2) for robust alkaline HER. Experimental and theoretical results reveal that surface CeO2 suppresses hydroxide-induced Mo dissolution while maintaining the reduced state of Ni4Mo and promoting interfacial water dissociation, thereby accelerating HER kinetics and increasing stability. Our catalyst delivers 1.0 A cm-2 at an overpotential of 165 mV and sustains hydrogen production for more than 3000 h with negligible decay. When used as the cathode in a platinum-group-metal-free AEM water electrolyzer, it achieves a value of 2.0 A cm-2 at 1.68 V, surpassing the DOE 2026 AEM benchmark of 2.0 A cm-2 at 1.8 V, and operates for 1200 h at 1.0 A cm-2 with a low degradation rate of 42.8 μV h-1.
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