Surface Oxidation and Reduction of CuO and Cu2O Studied Using XPS and XAES

Surface and Interface AnalysisVolume 24, Issue 12 p. 811-820 Research Article Surface Oxidation and Reduction of CuO and Cu2O Studied Using XPS and XAES S. Poulston, S. Poulston Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this authorP. M. Parlett, P. M. Parlett Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this authorP. Stone, P. Stone Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this authorM. Bowker, Corresponding Author M. Bowker Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKReading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this author S. Poulston, S. Poulston Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this authorP. M. Parlett, P. M. Parlett Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this authorP. Stone, P. Stone Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this authorM. Bowker, Corresponding Author M. Bowker Reading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKReading Catalysis Centre, University of Reading, Department of Chemistry, Whiteknights, Reading, UKSearch for more papers by this author First published: November 1996 https://doi.org/10.1002/(SICI)1096-9918(199611)24:12<811::AID-SIA191>3.0.CO;2-ZCitations: 744AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Using XPS and x-ray-excited Auger electron spectroscopy (XAES), we have studied the variation in surface composition of CuO and Cu2O with a variety of high-vacuum treatments, including vacuum annealing, oxidation and hydrogen reduction. Prolonged annealing of CuO results in the formation of a thick layer of Cu2O at the surface whilst vacuum annealing of Cu2O produces a thin (possibly one monolayer) film of Cu metal. Both bulk Cu2O and the thick Cu2O film generated from vacuum-annealed CuO were oxidized to CuO by heating at 800 K in 1×10-4 mbar O2, the original surface being regenerated with vacuum annealing at the same temperature. Both CuO and Cu2O are reduced to metal at the surface by heating in 1×10-4 mbar hydrogen at 400 K. In the case of CuO, the extent of reduction varies with the thermal history of the sample, with prolonged vacuum annealing producing a more reducible surface. Hydrogen-reduced CuO and Cu2O were both reoxidized on vacuum annealing, demonstrating the diffusion of lattice oxygen to the surface. Citing Literature Volume24, Issue12November 1996Pages 811-820 RelatedInformation