Physicochemical and electrocatalytic properties of Li-Co3O4 anodes prepared by chemical spray pyrolysis for application in alkaline water electrolysis

被引:54
作者
Hamdani, M
Pereira, MIS [1 ]
Douch, J
Addi, AA
Berghoute, Y
Mendonça, MH
机构
[1] Univ Lisbon, Fac Ciencias, Ctr Ciencias Mol & Mat, P-1699 Lisbon, Portugal
[2] Univ Ibnou Zohr, Fac Sci, Chim Phys Lab, Agadir, Morocco
关键词
thin films; oxygen evolution; electrocatalysis; cobalt oxides; chemical spray pyrolysis;
D O I
10.1016/j.electacta.2003.11.016
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
An electrode kinetic study of oxygen evolution has been made on Li-Co3O4 thin films in KOH aqueous solutions with different concentrations. Oxide films with different amounts of Li were prepared on glass, by chemical spray pyrolysis at 300degreesC, followed by a heat treatment at 400degreesC in air. The Li doping increases the electrical conductivity of these materials. In what concerns the roughness factor, an increase is also observed up to 3% of Li. From steady-state current-potential measurements, Tafel slopes close to 2.3RT/F were obtained in the low current range, irrespective to electrolyte concentration and Li percentage, pointing to the same oxygen evolution mechanism onto all prepared oxides. The reaction order with respect to OH- was found to be approximately 1.7. The electrodes performance towards the oxygen evolution increases with the increase in Li content. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1555 / 1563
页数:9
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