Paper Title:
Electrocatalytic Behavior of Perovskite-Related Cobaltites and Nickelates in Alkaline Media
  Abstract

Dense ceramic anodes of perovskite-type La1-x-ySrxCo1-zAlzO3-δ ( x = 0.45-0.70; y = 0- 0.05; z = 0-0.20) and K2NiF4-type La2Ni1-xMexO4+δ (Me = Co, Cu; x = 0-0.20), synthesized by the glycine-nitrate technique, were assessed for oxygen evolution in alkaline media. The lowest overpotentials are observed for (La0.3Sr0.7)0.97CoO3-δ, which exhibits a significant oxygen deficiency in combination with high conductivity associated with the A-site cation nonstoichiometry compensation mechanism via Co4+ formation. Perovskite-type cobaltite anodes are essentially stable in alkaline solutions, whilst La2NiO4-based electrodes exhibit degradation at the potentials where the oxygen evolution occurs, probably due to the electrochemical oxygen intercalation in the lattice.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
1391-1395
DOI
10.4028/www.scientific.net/MSF.514-516.1391
Citation
S. K. Poznyak, V. V. Kharton, J. R. Frade, A. A. Yaremchenko, E. V. Tsipis, I. P. Marozau, M. G.S. Ferreira, "Electrocatalytic Behavior of Perovskite-Related Cobaltites and Nickelates in Alkaline Media", Materials Science Forum, Vols. 514-516, pp. 1391-1395, 2006
Online since
May 2006
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