Oxygen evolution on Co3O4 and Li-doped Co3O4 coated electrodes in an alkaline solution

Citation
C. Bocca et al., Oxygen evolution on Co3O4 and Li-doped Co3O4 coated electrodes in an alkaline solution, INT J HYD E, 24(8), 1999, pp. 699-707
Citations number
20
Categorie Soggetti
Environmental Engineering & Energy
Journal title
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN journal
03603199 → ACNP
Volume
24
Issue
8
Year of publication
1999
Pages
699 - 707
Database
ISI
SICI code
0360-3199(199908)24:8<699:OEOCAL>2.0.ZU;2-R
Abstract
The oxygen evolution reaction (OER) was investigated at 60 degrees C in 15 wt% NaOH solution on Co3O4, Li-doped Co3O4 and perovskite-type oxide (LaNiO 3) electrodes. Cobalt and Li-doped cobalt oxides were obtained by different preparation techniques and were applied to chemically-pickled nickel plate s. The obtained phases were structurally characterized by X-ray powder diff raction, The electrodes were subjected to electrochemical measurements, bef ore and after electrochemical ageing (21 days, 150 mA cm(-2)). The correlat ion between the coating preparations and their electrocatalytic activity wa s investigated. The efficiency of the studied electrodes seems to depend on the preparation method. Two Tafel slopes for the OER were observed in most cases. This behaviour was interpreted on the basis of a change in the vale nce state of the surface oxide. (C) 1999 International Association for Hydr ogen Energy. Published by Elsevier Science Ltd. All rights reserved.