Atomic-thick metastable phase RhMo nanosheets for hydrogen oxidation catalysis

Juntao Zhang, Xiaozhi Liu, Yujin Ji, Xuerui Liu, Dong Su (), Zhongbin Zhuang, Yu-Chung Chang, Chih-Wen Pao, Qi Shao (), Zhiwei Hu and Xiaoqing Huang ()
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Juntao Zhang: Xiamen University
Xiaozhi Liu: Institute of Physics, Chinese Academy of Sciences
Yujin Ji: Soochow University
Xuerui Liu: Beijing University of Chemical Technology
Dong Su: Institute of Physics, Chinese Academy of Sciences
Zhongbin Zhuang: Beijing University of Chemical Technology
Yu-Chung Chang: National Synchrotron Radiation Research Center
Chih-Wen Pao: National Synchrotron Radiation Research Center
Qi Shao: Soochow University
Zhiwei Hu: Max Planck Institute for Chemical Physics of Solids
Xiaoqing Huang: Xiamen University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Metastable phase two-dimensional catalysts provide great flexibility for modifying their chemical, physical, and electronic properties. However, the synthesis of ultrathin metastable phase two-dimensional metallic nanomaterials is highly challenging, mainly due to the anisotropic nature of metallic materials and their thermodynamically unstable ground-state. Here, we report free-standing RhMo nanosheets with atomic thickness and a unique core/shell (metastable phase/stable phase) structure. The polymorphic interface between the core region and shell region stabilizes and activates metastable phase catalysts; the RhMo Nanosheets/C shows excellent hydrogen oxidation activity and stability. Specifically, the mass activities of RhMo Nanosheets/C is 6.96 A mgRh−1; this is 21.09 times higher than that of commercial Pt/C (0.33 A mgPt−1). Density functional theory calculations suggest that the interface aids in the dissociation of H2 and the H species can then spillover to weak H binding sites for desorption, providing excellent hydrogen oxidation activity for RhMo nanosheets. This work advances the highly controlled synthesis of two-dimensional metastable phase noble metals and provides great directions for the design of high-performance catalysts for fuel cells and beyond.

Date: 2023
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DOI: 10.1038/s41467-023-37406-y

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