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Elucidating the role of oxygen coverage in CO2 reduction on Mo2C

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Abstract

Molybdenum carbide (Mo2C) is a promising and low-cost catalyst for the conversion of CO2 to CO. However, the underpinning mechanism occurring on the catalyst surface and the understanding of the catalyst structure under the reaction conditions is still elusive. In this study, we employ first principles calculations to understand the CO2 dissociation mechanism on β-Mo2C (001) under different oxygen coverage on the catalyst surface (oxycarbide). Our results demonstrate that with increasing oxygen coverage, there is an electronic modification on the catalyst surface (e.g. d-band shift on Mo atoms), that in turn, tunes the interactions of the adsorbates and the CO2 dissociation barriers. Interestingly, we reveal linear relationships between the oxygen coverage and electronic modification with the reactivity of the catalyst. We show that CO2 can adsorb and dissociate on the oxygen covered Mo2C surface, even in the presence of surface oxygen up to 0.5 monolayer (ML). Our results rationalize a series of experimental observations.

Graphical abstract: Elucidating the role of oxygen coverage in CO2 reduction on Mo2C

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Publication details

The article was received on 01 Sep 2017, accepted on 09 Oct 2017 and first published on 10 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01810J
Citation: Catal. Sci. Technol., 2017, Advance Article
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    Elucidating the role of oxygen coverage in CO2 reduction on Mo2C

    M. Dixit, X. Peng, M. D. Porosoff, H. D. Willauer and G. Mpourmpakis, Catal. Sci. Technol., 2017, Advance Article , DOI: 10.1039/C7CY01810J

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