石墨烯
催化作用
材料科学
渗透(战争)
氧化物
吸附
化学工程
金属
氧气
过渡金属
纳米技术
化学
物理化学
冶金
有机化学
工程类
运筹学
作者
Yong Wang,Pengju Ren,Jianfeng Hu,Yunchuan Tu,Zhongmiao Gong,Yi Cui,Yanping Zheng,Mingshu Chen,Wu-Jun Zhang,Chao Ma,Liang Yu,Fan Yang,Ye Wang,Xinhe Bao,Dehui Deng
标识
DOI:10.1038/s41467-021-26089-y
摘要
Abstract Achieving CO oxidation at room temperature is significant for gas purification but still challenging nowadays. Pt promoted by 3 d 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/CoNiO x catalysts. Experiments and theoretical calculations indicate that CO will saturate Pt sites, but O 2 can adsorb at the Pt-graphene interface without competing with CO, which facilitate the O 2 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.
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