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Relationship between surface open cells of α-MnO2 and CO oxidation ability from a surface focused point of view

Abstract

α-MnO2 is a widely reported material for catalysis reactions. However, due to its complicated structure with 2×2 tunnels, the knowledge of the surface structure and the relationship with catalysis performance for α-MnO2 is rare, though the understanding of this is key for developing better catalysts. Herein, a surface focused structure-performance relationship regarding to the oxidation of CO is established in this work. It is shown that the 2×2 tunnels are open at the surface {100} planes via transmission electron microscopy (TEM), TEM simulation, and CeO2 probe deposition experiments. Since α-MnO2 is rod-like and wrapped with {100} planes, the surface of α-MnO2 consists mainly of these open cells structure. The open cells are rich of adsorption sites for O2. Furthermore, these surface sites are also highly oxidative in property. Owing to the fact that CO can react with surface oxygen species to yield CO2, the promoted adsorption of O2 and the oxidative surface sites will benefit CO oxidation over α-MnO2. Thus, a superior performance for CO oxidation can be related to the open cell structure. This work not only establishes the surface structure-performance relationship, but also provide a new point of view to the understanding of structure of α-MnO2 by emphasising the surface open cells.

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Publication details

The article was received on 27 May 2017, accepted on 17 Aug 2017 and first published on 17 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04624C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Relationship between surface open cells of α-MnO2 and CO oxidation ability from a surface focused point of view

    K. Li, J. Chen, Y. Peng, W. Lin, T. Yan and J. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04624C

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