SPE-防水气体扩散电极研究(Ⅱ)——Co的氧化及稳定性

Studies on Nafion-Pt Hydrophobic Gas Diffusing Electrode (Ⅱ)——CO Oxidation and its Stability

考查了CO在Nation-Pt防水气体扩散电极上的电化学氧化行为,发现CO氧化电流在酸性溶液比碱性溶液中大,恒电位下电机电流在几小时内随时间增加而减小,最后至稳定值,决定此稳态电流值的控制步骤是水在Nafion膜中的扩散速度,这些特征可用Nation膜离子选择性解释。

The current of CO oxidation at the Nafion-Pt hydrophobic electrode is higher in 0. 5 mol/L H2SO4 than in 1 mol/L NaOH and decays with time over a few hours till reaching a steady state. These observation can be explained in terms of the ion-selectivity of Nafion and the Limited transport rate of water across the membrane.