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延展适用于电化学氧还原反应的旋转环盘电极的分析方法(英文)

Kuang-Hsu(Tim)Wu  Da-Wei Wang  Dang-Sheng Su  
【摘要】:The use of rotating ring-disk electrode(RRDE) has become a general practice for evaluating the oxygen reduction reaction(ORR) performed on electrocatalysts. In this work, we establish a series of practically useful analytical equations for important ORR parameters as a function of the ratio of disk-to-ring current densities(jD/jR), based on the fundamental electrokinetic processes on a RRDE from first-principle. Our derivation demonstrates that the conventional analytical equations presume a stepwise ORR scheme as displayed in Figure 1. From this scheme, we provide four complementary activity indices for the ORR and two analytical solutions to the reaction current density for HO_2~- generation and reduction reaction. The sensitivity of the activity indices is evaluated and a current density deconvolution method is put forward for a better-resolved Tafel analysis for the ORR. Finally, we obtain the analytical equations for the ORR regarding the chemical HO_2~- decomposition path and discuss the accuracy of simple analysis when the chemical HO_2~- decomposition is possibly involved.

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中国期刊全文数据库 前1条
1 刘磊;旋转环盘电极在研究氧还原机理中的应用[J];信阳师范学院学报(自然科学版);1989年03期
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