Electron penetration triggering interface activity of Pt-graphene for CO oxidation at room temperature

Yong Wang, Pengju Ren, Jingting Hu, Yunchuan Tu, Zhongmiao Gong, Yi Cui, Yanping Zheng, Mingshu Chen, Wujun Zhang, Chao Ma, Liang Yu, Fan Yang, Ye Wang, Xinhe Bao and Dehui Deng ()
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Yong Wang: Xiamen University
Pengju Ren: Institute of Coal Chemistry, Chinese Academy of Sciences
Jingting Hu: Xiamen University
Yunchuan Tu: Xiamen University
Zhongmiao Gong: Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences
Yi Cui: Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences
Yanping Zheng: Xiamen University
Mingshu Chen: Xiamen University
Wujun Zhang: Hunan University
Chao Ma: Hunan University
Liang Yu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Fan Yang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Ye Wang: Xiamen University
Xinhe Bao: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Dehui Deng: Xiamen University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Achieving CO oxidation at room temperature is significant for gas purification but still challenging nowadays. Pt promoted by 3d transition metals (TMs) is a promising candidate for this reaction, but TMs are prone to be deeply oxidized in an oxygen-rich atmosphere, leading to low activity. Herein we report a unique structure design of graphene-isolated Pt from CoNi nanoparticles (PtǀCoNi) for efficiently catalytic CO oxidation in an oxygen-rich atmosphere. CoNi alloy is protected by ultrathin graphene shell from oxidation and therefore modulates the electronic property of Pt-graphene interface via electron penetration effect. This catalyst can achieve near 100% CO conversion at room temperature, while there are limited conversions over Pt/C and Pt/CoNiOx catalysts. Experiments and theoretical calculations indicate that CO will saturate Pt sites, but O2 can adsorb at the Pt-graphene interface without competing with CO, which facilitate the O2 activation and the subsequent surface reaction. This graphene-isolated system is distinct from the classical metal-metal oxide interface for catalysis, and it provides a new thought for the design of heterogeneous catalysts.

Date: 2021
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DOI: 10.1038/s41467-021-26089-y

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