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Mn–graphene single-atom catalyst evaluated for CO oxidation by computational screening

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Abstract

The non-noble transition metals (Sc, Ti, V, Cr, Mn) embedded in graphene as single-atom catalysts have been comprehensively screened for CO oxidation using density functional theory calculations. Among these options, Mn–graphene is predicted to have superior activity for CO oxidation. This conclusion is based on the binding energy between metal atom and graphene substrate, diffusion barrier of metal atom on graphene, and reaction barrier based on the transition state analysis. On the other hand, Sc–, Ti–, V–, and Cr–graphene bind O2 too strongly. This will lead to catalyst poisoning by O for these systems. We expect that Mn–graphene should be straight forward to fabricate experimentally, and predict that it will be a novel, stable, and efficient single-atom catalyst. For Mn–graphene, the Langmuir–Hinshelwood (LH) and Eley–Rideal (ER) mechanisms of CO oxidation have been investigated. However, the CO molecules cannot interact with surface activated O2 on graphene to form carbonate-like CO3 complexes or other intermediates. This demonstrates that CO oxidation will not proceed via the ER mechanism. The reaction mechanism for catalysis of CO oxidation occurs in two steps: The LH mechanism CO + O2→ OCOO → CO2 + O followed by the ER mechanism CO + O → CO2. The energy barriers are 0.57–0.69 eV and 0.08 eV, respectively. These barriers are comparable to or smaller than those for Ni and Mo, indicating high activity. Brief molecular dynamics simulations were also performed on this system. We predict that Mn–graphene can be used as a single-atom catalyst for CO oxidation over a broad range of temperatures. The present work should inspire experimental work on synthesis of novel single-atom catalysts.

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Acknowledgements

L. X. and L.-M. Y. gratefully acknowledges the support from National Natural Science Foundation of China (Grant No. 21673087), startup fund (2006013118 and 3004013105) and independent innovation research fund (0118013090) from Huazhong University of Science and Technology. We thank the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for supercomputing resources. The DFT calculations were carried out on the Mesabi and Itasca supercomputers at the MSI.

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Authors and Affiliations

  1. Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica; Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Materials Chemistry and Service Failure; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Lu Xu & Li-Ming Yang

  2. School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN, 55455, USA

    Eric Ganz

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  1. Lu Xu
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  2. Li-Ming Yang
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  3. Eric Ganz
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Correspondence to Li-Ming Yang.

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Xu, L., Yang, LM. & Ganz, E. Mn–graphene single-atom catalyst evaluated for CO oxidation by computational screening. Theor Chem Acc 137, 98 (2018). https://doi.org/10.1007/s00214-018-2270-8

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