Electron penetration triggering interface activity of Pt-graphene for CO oxidation at room temperature.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34608162.
- Also identified by DOI 10.1038/s41467-021-26089-y and PMC identifier 8490350.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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/CoNiO<sub>x</sub> catalysts. Experiments and theoretical calculations indicate that CO will saturate Pt sites, but O<sub>2</sub> can adsorb at the Pt-graphene interface without competing with CO, which facilitate the O<sub>2</sub> 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.