Proton transport in radiation-grafted membranes for fuel cells as detected by SECM

被引：21

作者：

Kallio, T

Slevin, C

Sundholm, G

Holmlund, P

Kontturi, K

机构：

[1] Aalto Univ, Lab Phys Chem & Electrochem, FIN-02015 Helsinki, Finland

[2] Abo Akad Univ, Lab Polymer Technol, FIN-20500 Turku, Finland

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2003年 / 5卷 / 07期

基金：

芬兰科学院;

关键词：

cation exchange membrane; scanning electrochemical microscopy; diffusion of protons; conductivity;

D O I：

10.1016/S1388-2481(03)00117-6

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Scanning electrochemical microscopy (SECM) has been applied to investigate counter ion transport through four different proton conducting membranes with poly(styrene sulfonic acid) side chains. These membranes, intended for the polymer electrolyte fuel cell, are based on PVDF and PVDF-co-HFP matrix materials and have been prepared by an irradiation grafting method. SECM is found to be suitable for mapping variations in proton diffusion coefficient and concentration in these inhomogeneous membranes. It was found that the variations in these parameters are most considerable in a membrane with a high degree of grafting. Ionic conductivities measured with impedance spectroscopy were in agreement with calculated values obtained on the basis of the SECM measurements. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

收藏

页码：561 / 565

页数：5

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