Changes of the electrochemical behavior of nickel electrodes in diluted sulfuric acid under different illumination conditions

Química Nova

Gonçalves, Reinaldo Simões¹  Universidade Federal de Santa Maria, Santa Maria¹  Vendrame, Zilda Baratto¹ 

关键词: nickel;    photo-effects;    photo-inhibition.;   

DOI  :  10.1590/S0100-40421997000600004

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this paper is presented electrochemical evidences of the influence of the light on the electrochemical behavior of nickel electrode in diluted sulfuric acid. The current densities related with the electrooxidation of the metal decreases when the electrode is under illumination. The corrosion potential, Ecorr , shift to a more positive value in this condition. This effect was observed with polychromatic light and with different wavelength glass filters such as 700 nm and 520 nm. It was observed that increasing the temperature of the solution, the current densities related with cathodic and anodic processes, increases instead of decreases. The activation energy related with the electrooxidation of the electrode was higher under illumination than in the dark. It is suggested that this behavior may be related or with a photo-inhibition effect either with dessorption of adsorbed water involved in the electrooxidation mechanism.

【 授权许可】

Unknown