Analysis of the kinetics of borohydride oxidation in Cu anode for direct borohydride fuel cell
- 作者：Donghong Duan ; dhduan@163.com ; Shibin Liu ; Yanping Sun ; ypsun@tyut.edu.cn
- 关键词：Direct borohydride fuel cell ; Cu anode ; Borohydride oxidation ; Mathematic model
- 刊名：Journal of Power Sources
- 出版年：2012
- 期刊代码：58_03787753
- 类别：ce
- 出版时间：15 July, 2012
- 卷：210
- 期：Complete
- 页码：198-203
- 文件大小：466 K
摘要
A multi-step mechanism is discussed for the oxidation of BH4鈭?/sup> on Cu anode in NaOH solution. Polarization experiments are conducted in 2 M sodium hydroxide solutions with 0.5, 1.0, and 2.0 M NaBH4 at 25, 50, and 75 掳C, respectively. The rate-determining step is the electrochemical oxidation of that reacted with at low overpotentials and changes to the competitive adsorption of BH4鈭?/sup> or OH鈭?/sup> at higher overpotentials. The theoretical predictions are satisfactorily in accordance with the polarization data. However, these predictions deviate from the data at the highest temperature or concentration of BH4鈭?/sup> because of the bubbling of the side product, H2.