论文部分内容阅读
用分解稳态极化曲线的方法,在PbO_2阳极上,H_2SO_4和H_2SO_4-(NH_4)_2SO_4溶液中得到了相应于S_2O_8~(2-)形成和O_2发生的动态力学数据。在高于+2.25V的电位区,这两个反应的Tafel斜率都是2.303RT/βF(β=0.52～O.55),S_2O_8~(2-)形成的电流效率低于29％,且几乎不随阳极电位而改变。S_2O_8~(2-)的形成速度与溶液中硫酸离子浓度无关,而O_2发生速度随硫酸离子浓度的增大稍有减慢。提出了在高电位区S_2O_8~(2-)形成及O_2发生的机理。
By decomposing the steady state polarization curves, dynamic mechanical data corresponding to the formation of S_2O_8 ~ (2-) and O_2 were obtained on PbO_2 anode, H_2SO_4 and H_2SO_4- (NH_4) _2SO_4 solutions. The Tafel slopes of these two reactions are both 2.303RT / βF (β = 0.52 ~ 0.55) in the potential region above + 2.25V, and the current efficiency of S_2O_8 ~ (2-) is less than 29% Does not change with the anode potential. The formation rate of S_2O_8 ~ (2-) was not related to the concentration of sulfate ion in solution, while the velocity of O_2 slightly decreased with the increase of sulfate ion concentration. The mechanism of formation of S_2O_8 ~ (2-) and O_2 in the high potential region was proposed.