Electrophysical properties of polymer electrolyte membranes: A random network model

被引:170
作者
Eikerling, M
Kornyshev, AA
Stimming, U
机构
[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST ENERGIEVERFAHRENSTECH, D-52425 JULICH, GERMANY
[2] RUSSIAN ACAD SCI, AN FRUMKIN ELECTROCHEM INST, MOSCOW 117071, RUSSIA
关键词
D O I
10.1021/jp972288t
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A random network model of charge transport in porous polymer membranes is proposed and investigated by means of an effective medium theory. Specific conductivity and geometrical capacity (dielectric constant) of membranes are calculated in dependence of water content, taking swelling effects into account. The conductivity shows a quasi-percolation type dependence, growing above a certain critical water content, while taking below it a value typical of residual conductivity in dry membranes. The geometrical capacity can show an increase with water content or it can undergo a maximum at the percolation threshold, depending on the model parameters. The theoretical findings are in line with experimental observations of the membrane complex impedance as a function of water content. The results suggest a frame for classification of different types of polymer membranes with regard to their performance, depending on swelling properties.
引用
收藏
页码:10807 / 10820
页数:14
相关论文
共 43 条
[1]   Random-network simulation of an ultracapacitor based on metal-solid-electrolyte composite [J].
Abel, J ;
Kornyshev, AA .
PHYSICAL REVIEW B, 1996, 54 (09) :6276-6286
[2]   Studies on ion-exchange membranes .1. Effect of humidity on the conductivity of Nafion(R) [J].
Anantaraman, AV ;
Gardner, CL .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1996, 414 (02) :115-120
[3]  
BERNARDI DM, 1991, ELECTROCHEM SOC P, V9110, P240
[4]   EFFECTIVE-MEDIUM THEORIES FOR SITE-DISORDERED RESISTANCE NETWORKS [J].
BERNASCONI, J ;
WIESMANN, HJ .
PHYSICAL REVIEW B, 1976, 13 (03) :1131-1139
[5]   CONDUCTANCE OF NAFION-117 MEMBRANES AS A FUNCTION OF TEMPERATURE AND WATER-CONTENT [J].
CAPPADONIA, M ;
ERNING, JW ;
NIAKI, SMS ;
STIMMING, U .
SOLID STATE IONICS, 1995, 77 :65-69
[6]   PROTON CONDUCTION OF NAFION((R))-117 MEMBRANE BETWEEN 140 K AND ROOM-TEMPERATURE [J].
CAPPADONIA, M ;
ERNING, JW ;
STIMMING, U .
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1994, 376 (1-2) :189-193
[7]  
Dippel T., 1995, Ferroelectrics, V167, P59, DOI 10.1080/00150199508007720
[8]   DISTRIBUTION OF THE MICELLES IN HYDRATED PERFLUORINATED IONOMER MEMBRANES FROM SANS EXPERIMENTS [J].
DREYFUS, B ;
GEBEL, G ;
ALDEBERT, P ;
PINERI, M ;
ESCOUBES, M ;
THOMAS, M .
JOURNAL DE PHYSIQUE, 1990, 51 (12) :1341-1354
[9]  
EIKERLING M, UNPUB J ELECTROCHEM
[10]  
Eisenberg A., 1982, ACS S SERIES, V180