CO2 Activation on Cobalt Surface in the Presence of H2O: An Ambient-Pressure X-ray Photoelectron Spectroscopy Study

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Abstract

Co-based catalysts for CO2 reduction to liquid fuels have been attracting increasing attention. In this work, the distribution of surface intermediates on a polycrystalline Co foil was investigated by ambient-pressure X-ray photoelectron spectroscopy (APXPS) experiments under near ambient pressure and temperature conditions. The Co surface was partially oxidized, predominantly by carbonates, after CO2 dissociative adsorption. Graphitic carbon deposition on the partially oxidized Co surface was significantly lesser than that on the open surfaces of Cu and Ni under similar reaction conditions. Methoxy, formate, and a bulk carbonate formed upon the co-adsorption of H2O with a surprisingly high methoxy/formate coverage ratio. These results provide valuable mechanistic information for developing highly selective Co-based catalysts for CO2 reduction.

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Keywords

CO2 reduction H2Cobalt APXPS 

Notes

Acknowledgements

The part of this work performed in China was supported by the National Natural Science Foundation of China (11227902) and the Science and Technology Commission of Shanghai Municipality (14520722100). Y.L. would like to acknowledge the support of the “Hundred Talents Program” of the Chinese Academy of Sciences. The work performed at the Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DE-AC02- 05CH11231.

Compliance with Ethical Standards

Conflict of interest

The authors declares that they have no competing interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghaiChina
  2. 2.School of Physical Science and TechnologyShanghaiTech UniversityShanghaiChina
  3. 3.Advanced Light SourceLawrence Berkeley National LaboratoryBerkeleyUSA
  4. 4.University of Chinese Academy of SciencesBeijingChina

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