Issue 16, 2024

Electronic metal–support interaction via Ni defect-induced Ru-modified Ni–CeO2 for enhanced hydrogen oxidation activity

Abstract

The creation of refined surface vacancies, a crucial bridge between theoretical structural studies and catalyst design, has attracted significant attention. Herein, we utilize a MOF pyrolytic derivatization strategy to create monodispersed Ru nanoparticles anchored on Ni–CeO2 mesoporous microspheres with abundant Ni vacancies (Ru/Ni–CeO2). Introducing nickel vacancies in Ru/Ni–CeO2 is conducive to enhancing electrical conductivity and accelerating mass-charge transfer efficiency. As anticipated, the Ru/Ni–CeO2 displays admirable hydrogen oxidation reaction (HOR) electrocatalytic activity with exchange current density (j0) and mass activity reaching 3.27 mA cm−2 and 1.93 mA gRu−1, respectively, surpassing the values for cutting-edge Pt/C and most recorded Ru-based HOR electrocatalysts. Surprisingly, Ru/Ni–CeO2 demonstrates robust tolerance to 1000 ppm CO, outperforming Pt/C. Integrated analysis suggests that Ni defect-induced directional electron transfer at the Ru/Ni–CeO2 heterointerface arises from a strong electron–metal support interaction (EMSI) effect between Ru and Ni–CeO2. This interaction optimizes the adsorption of H and OH, thereby enhancing HOR behavior.

Graphical abstract: Electronic metal–support interaction via Ni defect-induced Ru-modified Ni–CeO2 for enhanced hydrogen oxidation activity

Supplementary files

Article information

Article type
Research Article
Submitted
16 May 2024
Accepted
28 Jun 2024
First published
09 Jul 2024

Inorg. Chem. Front., 2024,11, 5244-5253

Electronic metal–support interaction via Ni defect-induced Ru-modified Ni–CeO2 for enhanced hydrogen oxidation activity

S. Zhou, Y. Liu, L. Cheng, T. T. Isimjan, J. Tian and X. Yang, Inorg. Chem. Front., 2024, 11, 5244 DOI: 10.1039/D4QI01233J

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