论文部分内容阅读
本文采用连续脉冲技术和电位扫描法研究了铂阳极上的过电压和反应机理,实验发现,在电流密度0.078～1.5A/cm~2的范围内过电压与电流密度的关系符合Tafel方程:η=0.22+0.21lgi (Ⅴ)此结果与Thonstad所观察的结果比较一致,但与Drassbach的数据相距较远,在实验的基础上,讨论了反应的控制步骤和反应历程,认为过电压由活化极化所引起,反应按复合脱附历程进行: 上述结论由残余电动势法和电位扫描法进一步证明,在实验中还观察到在铂阳极上也可以发生阳极效应,这在文献中还未见报道,但是铂阳极上的临界电流密度相当高,当氧化铝浓度饱和时为60A/cm~2。
In this paper, we studied the over-voltage and the reaction mechanism of platinum anode by using continuous pulse and potential-scan method. It was found that the relationship between over-voltage and current density in the current density of 0.078 ~ 1.5A / cm ~ 2 was in accordance with Tafel equation = 0.22 + 0.21lgi (V) This result is consistent with that observed by Thonstad, but far away from the data of Drassbach. Based on the experiment, the control steps and reaction history of the reaction are discussed. The reaction is carried out according to the process of compound desorption: The above conclusion is further proved by the residual electromotive force method and the potential scanning method. It is also observed in the experiment that anodic effect can also occur on the platinum anode, which has not been reported in the literature, However, the critical current density on the platinum anode is quite high, which is 60 A / cm ~ 2 when the alumina concentration is saturated.