Oxygen evolution reaction on copper manganites—effect of preparation method and electrode manufacturing on superficial sites density
✍ Scribed by A. Restovic; G. Poillerat; P. Chartier; J.L. Gautier
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 617 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Ahstraet-The importance of transition metal oxides in electrocatalysis is well known. The electrocatalytical results can be attributed to both cationic composition of the oxide and electrode manufacturing. In order to study separately the surface area effects and the intrinsic catalytic nature, C~,+~Mnr_~0~ (1.4 2 1 + x > 1) spine1 oxides were synthesized by two different ways: spray pyrolysis and, thermal decomposition of metallic salts. The oxides obtained were characterized by means of X-ray diffraction (XRD), electrical conductivity and prc @H of zero charge) measurements. Five types of electrodes were obtained from the electrocatalytic candidate material. Their electrochemically accessible surface area (easa) was determined using Zn *' adsorption and kinetic measurements of a simple redox couple; results of which were in good agreement. The electrocatalytical activity of electrode materials was evaluated studying the oer (oxygen evolution reaction) in 1 M KOH. The activity was found to be dependent of the surface area effects and (Mn3+ + Mn4+) ions stoichiometry (octahedrally co-ordinated with oxygen atoms in spine1 structure). The possibility that information about the structure of the bulk oxide can be extrapolated to the surface is emphasized.