A thermodynamic approach to proton conductivity in acid-doped polybenzimidazole

被引：68

作者：

Bouchet, R ^{[1
]}

Miller, S ^{[1
]}

Duclot, M ^{[1
]}

Souquet, JL ^{[1
]}

机构：

[1] ENSEEG, Lab Electrochim & Physicochim Mat & Interfaces, F-38402 St Martin Dheres, France

来源：

SOLID STATE IONICS | 2001年 / 145卷 / 1-4期

关键词：

polybenzimidazole (PBI); acid-doped PBI; proton conductivity; Grotthus;

D O I：

10.1016/S0167-2738(01)00915-8

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：

Conductivity measurement on films of acid-doped polybenzimidazole (PBI) was performed by impedance spectroscopy, A complete set of data for PBI-H3PO4 and PBI-H2SO4 complexes is reported as a function of temperature (30-90 degreesC) and isostatic pressure (1-4000 bars). Experimental results indicate an activated mechanism for the proton migration. Isobar and isothermal conductivity data allow the determination of the characteristic thermodynamic parameters DeltaV * (4-10 cm(3) mol(-1)). DeltaH * (0.6-1.1 eV) and DeltaS * (40-190 J mol(-1) K-1), The dependence of these parameters on temperature and pressure is consistent with thermodynamic predictions. Based on a previous IR spectroscopic study of PBI-acid complexes, a microscopic model is developed, suggesting proton transfer from one imide site to another in which the anionic species participate by a Grotthus mechanism. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：69 / 78

页数：10

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