4.8 Article

Atomic-thick metastable phase RhMo nanosheets for hydrogen oxidation catalysis

Journal

NATURE COMMUNICATIONS
Volume 14, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41467-023-37406-y

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This study reports the synthesis of free-standing RhMo nanosheets with atomic thickness and a unique core/shell structure. The polymorphic interface between the core and shell regions stabilizes and activates the metastable phase catalysts, resulting in excellent hydrogen oxidation activity and stability.
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 mg(Rh)(-1); this is 21.09 times higher than that of commercial Pt/C (0.33 A mg(Pt)(-1)). Density functional theory calculations suggest that the interface aids in the dissociation of H-2 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. The synthesis of ultrathin two-dimensional metastable metallic nanomaterials is highly challenging. Here, the authors report free-standing RhMo nanosheets with atomic thickness and a core/shell (metastable/stable phase) structure for high performance towards hydrogen oxidation.

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