Influence of electrochemical pre-treatment on highly reactive carbon nitride thin films deposited on stainless steel for electrochemical applications
- 作者：A. Benchikha ; C. Debiemme-Chouvyb ; 1 ; H. Cachetb ; 1 ; A. Pailleretb ; 1 ; B. Saidania ; L. Beaunierb ; M.H. Bergerc ; C. Deslouisb ; 1 ; claude.deslouis@upmc.fr
- 关键词：Carbon nitride ; Electrochemical reactivity ; EIS ; Surface treatment ; Thin film
- 刊名：Electrochimica Acta
- 出版年：2012
- 期刊代码：30_00134686
- 类别：ch
- 出版时间：30 July, 2012
- 卷：75
- 期：Complete
- 页码：131-138
- 文件大小：2046 K
摘要
In this work, a-CNx films prepared by DC magnetron sputtering on stainless steel substrate have been investigated as electrode materials. While their wide potential window was confirmed as a property shared by boron doped diamond (BDD) electrodes, their electrochemical activity with respect to fast and reversible redox systems, [Ru(NH3)6]3+/2+, [Fe(CN)6]3鈭?4鈭?/sup> and [IrCl6]2鈭?3鈭?/sup>, was assessed by Electrochemical Impedance Spectroscopy (EIS) after cathodic or anodic electrochemical pre-treatments or for as grown samples.
It was shown for the three systems that electrochemical reactivity of the a-CNx films was improved after the cathodic pre-treatment and degraded after the anodic one, the apparent heterogeneous rate constant k0app being decreased by at least one order of magnitude for the latter case. A high k0app value of 0.11 cm s鈭? for [IrCl6]2鈭?3鈭?/sup> was obtained, close to the highest values found for BDD electrodes.