Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-23T04:58:19.519Z Has data issue: false hasContentIssue false
  • English
  • Français

Xps and Voltammetry Studies of Redox Behavior of Lacrl1− NixO3 Electrodes

Published online by Cambridge University Press:  15 February 2011

Greg Vovk ,
Xiaohua Chen  and
Charles A. Mims
Greg Vovk
Affiliation:
Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, M5S 3E5, Canada, [email protected]
Xiaohua Chen
Affiliation:
Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, M5S 3E5, Canada, [email protected]
Charles A. Mims
Affiliation:
Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, M5S 3E5, Canada
Get access

Abstract

An in-situ XPS and voltammetry investigation of the redox properties of LaCrj1-xNixO3(x = 0.4, 1) was carried out by incorporating the materials as one electrode in an electrochemical cell (LaCr1xNixO3|YSZ|Pd:PdO), which was directly mounted on a heated sample stage in an ultra high vacuum (UHV) chamber. Under a 0.7V cathodic bias, the perovskites reduce from formal oxidation state of Ni3+ to Ni2+. This reduction is accompanied by wholesale shifts of the Cr and O core level binding energies, in keeping with the delocalized electronic states in the material. The adsorption properties of the surfaces are affected by the redox state of the surfaces; increased CO2adsorption is observed on the reduced (and therefore more basic) surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 581
Copyright
Copyright © Materials Research Society 1999

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Tejuca, L.J., Fierro, J.L.J. and Tascon, J.M.D., Adv. Catal. 36, 237 (1989).Google Scholar
2. Hofer, H. and Kock, W.F., J. Electrochem. Soc. 140, 2557 (1993).Google Scholar
3. Stojanovic, M., Haverkamp, R.G., Mims, C.A., Moudallal, H. and Jacobson, A.J., J. Catal. 165, 315 (1997).Google Scholar
4. Stojanovic, M., Mims, C.A., Moudallal, H., Yang, Y.L. and Jacobson, A.J., J. Catal. 166, 324 (1997).Google Scholar
5. Stout, D.A., Gavelli, G., Lumsden, J.B. and Staehle, R.W., Surf. Sci. 69, 741 (1977).Google Scholar
6. Wiemhofer, H.-D., Ber. Bunsenges. Phys. Chem. 97, 461 (1993).Google Scholar
7. Esteva, J.M., Kamatak, R.C., Fuggle, J.C. and Sawatzky, G.A., Phys. Rev. Lett. 50, 910 (1983).Google Scholar
8. Schneider, W.-D., Delley, B., Wuilloud, E., Imer, J.-M. and Baer, Y., Phys. Rev. B 32, 6819 (1985).Google Scholar
9. Imada, S. and Jo, T., Physics Scripta 41, 115 (1990).Google Scholar
10. Berthou, H., Jorgensen, C.K. and Bonnelle, C., Chem. Phys. Lett. 38, 199 (1976).Google Scholar
11. Stojanovic, M., Ph.D. thesis, University of Toronto (1998).Google Scholar
12. Jacobson, A. J. and Moudallal, H., unpublished results.Google Scholar