Catalytic properties of trivalent rare-earth oxides with intrinsic surface oxygen vacancy

Kai Xu, Jin-Cheng Liu, Wei-Wei Wang, Lu-Lu Zhou, Chao Ma, Xuze Guan, Feng Ryan Wang (), Jun Li (), Chun-Jiang Jia () and Chun-Hua Yan
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Kai Xu: Shandong University
Jin-Cheng Liu: Tsinghua University
Wei-Wei Wang: Shandong University
Lu-Lu Zhou: Shandong University
Chao Ma: Hunan University
Xuze Guan: University College London, Roberts Building, Torrington Place
Feng Ryan Wang: University College London, Roberts Building, Torrington Place
Jun Li: Tsinghua University
Chun-Jiang Jia: Shandong University
Chun-Hua Yan: Peking University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Oxygen vacancy (Ov) is an anionic defect widely existed in metal oxide lattice, as exemplified by CeO2, TiO2, and ZnO. As Ov can modify the band structure of solid, it improves the physicochemical properties such as the semiconducting performance and catalytic behaviours. We report here a new type of Ov as an intrinsic part of a perfect crystalline surface. Such non-defect Ov stems from the irregular hexagonal sawtooth-shaped structure in the (111) plane of trivalent rare earth oxides (RE2O3). The materials with such intrinsic Ov structure exhibit excellent performance in ammonia decomposition reaction with surface Ru active sites. Extremely high H2 formation rate has been achieved at ~1 wt% of Ru loading over Sm2O3, Y2O3 and Gd2O3 surface, which is 1.5–20 times higher than reported values in the literature. The discovery of intrinsic Ov suggests great potentials of applying RE oxides in heterogeneous catalysis and surface chemistry.

Date: 2024
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DOI: 10.1038/s41467-024-49981-9

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