Oxygen reduction on a high-surface area Pt/Vulcan carbon catalyst: a thin-film rotating ring-disk electrode study
Oxygen reduction on a high-surface area Pt/Vulcan carbon catalyst: a thin-film rotating ring-disk electrode study
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DOI：
10.1016/s0022-0728(00)00407-1
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发表时间：
2001-01-05
影响因子：
4.5
通讯作者：
Behm, RJ
中科院分区：
文献类型：
--
作者：
Paulus, UA;Schmidt, TJ;Behm, RJ
介绍了最近发展起来的薄膜转盘电极法及其在转环盘构型(RRDE)中的应用，用于研究负载型催化剂粉末(PtVulcan XC72碳)上的氧还原反应(ORR)。这使得可以直接确定ORR的动力学数据，例如反应级数或表观活化能，而不需要数学建模。收集实验表明，电势和转速无关的收集效率。RRDE测量允许。首次在负载型催化剂上直接测定氧还原时产生的过氧化氢的分数。最后，在0.5M H_2SO_4和0.5M HClO_4中的测量结果的比较表明，(Bi)硫酸盐吸附对ORR活性有显著的影响。在此基础上，预测了在100%利用率下，在没有欧姆阻力和传质阻力的情况下，聚合物电解质燃料电池中ORR的动力学极限。(C)2001 Elsevier Science B.V.保留所有权利。
We describe the adaptation of the recently developed thin-film rotating disk electrode method and its application in a rotating ring disk configuration (RRDE) to the investigation of the oxygen reduction reaction (orr) on a supported catalyst powder (PtVulcan XC 72 carbon). This allows the determination of kinetic data, such as reaction orders or apparent activation energies, for the orr directly without mathematical modeling. Collection experiments reveal a potential and rotation rate independent collection efficiency. RRDE measurements allow. for the first time, the direct determination of the fraction of peroxide production juring oxygen reduction on supported catalysts. Finally, comparison of measurements in 0.5 M H2SO4 and 0.5 M HClO4, respectively, reveals a significant effect of (bi)sulfate adsorption on the orr activity. On the basis of the present results, predictions are made on the kinetic limit of the orr in polymer electrolyte fuel tells, in the absence of ohmic and mass transport resistances at 100% utilization. (C) 2001 Elsevier Science B.V. All rights reserved.