ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Oxygen evolution on Ti/Co₃O₄-coated electrodes in alkaline solution

S. Palmas, F. Ferrara, A. Pisu, and C. Cannas

Dipartimento di Ingegneria Chimica e Materiali, Universitá degli studi di Cagliari, Piazza d’Armi, 09123 Cagliari, Italia

E-mail: sipalmas@dicm.unica.it

Received: 30 March 2006  Revised: 22 September 2006  Accepted: 22 September 2006

Abstract: The electrochemical performances of Co₃O₄ nanopowders, obtained by the sol-gel method, were investigated and compared with those of commercial Co₃O₄ powders, for oxygen evolution reaction in alkaline solution. The active oxide powder was mixed with teflon and assembled on Ti substrate to form thin catalyst film. Cyclic voltammetry, polarization curves, and electrochemical impedance spectroscopy were used to assess the mechanism of oxygen evolution reaction, chemical structure, and morphology of the catalyst.

Keywords: oxygen evolution - cobalt oxides - coated electrode - sol-gel preparation

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-007-0002-y

Chemical Papers 61 (2) 77–82 (2007)