Oxygen Reduction at Nafion Film‐Coated Platinum Electrodes: Transport and Kinetics
Oxygen Reduction at Nafion Film‐Coated Platinum Electrodes: Transport and Kinetics
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DOI：
10.1149/1.2096247
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发表时间：
1988-09
影响因子：
3.9
通讯作者：
D. Lawson;L. D. Whiteley;C. Martin;M. Szentirmay;Jie I. Song
中科院分区：
文献类型：
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作者：
D. Lawson;L. D. Whiteley;C. Martin;M. Szentirmay;Jie I. Song
本文所述工作的主要目标是评估商业全氟磺酸盐离聚物（Nation）中O2的浓度和扩散系数，并评估该离聚物膜对基底Pt电极表面处O2还原速率的影响。电化学实验在国家薄膜涂层电极被用来获得这些数据。一个高温薄膜流延程序，已被证明产生高品质的溶液流延的民族膜，被用来制备民族涂层电极。在电化学实验过程中，将Nation薄膜涂层电极与0.7 M H3 PO 4平衡并暴露于该H3 PO 4中;将在薄膜涂层电极处获得的扩散、溶解度和动力学数据与暴露于该电解质的裸电极处获得的类似数据进行比较是特别有趣的。我们已经发现，在Nation中的扩散系数低于在电解质溶液中的扩散系数，但是溶解度和氧还原速率较高。
The primary objectives of the work described in this paper were to evaluate the concentration and diffusion coefficient ofO2 in a commercial perfluorosulfonate ionomer (Nation) and to assess the effect of a film of this ionomer on the rate of 02 reduction at a substrate Pt electrode surface. Electrochemical experiments at Nation film-coated electrodes were used to obtain these data. A high temperature film-casting procedure, which has been shown to yield high quality solution-cast Nation films, was used to prepare the Nation-coated electrodes. The Nation film-coated electrodes were equilibrated with and exposed to 0.7 M H3PO4 during the electrochemical experiments; it was of particular interest to compare the diffusion, solubility, and kinetic data obtained at the film-coated electrode to analogous data obtained at a bare electrode, exposed to this electrolyte. We have found that the diffusion coefficient is lower in Nation than in the electrolyte solution but that the solubility and oxygen reduction rate are higher.