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Title: Proton conductivity of perfluorosulfonate ionomers at high temperature and high relative humidity

The proton transport properties of Nafion membranes were studied in a wide range of temperature by using an air-tight sample holder able to maintain the sample hydrated at high relative humidity. The proton conductivity of hydrated Nafion membranes continuously increased in the temperature range of 40–180 °C with relative humidity kept at RH = 100%. In the temperature range of 40–90 °C, the proton conductivity followed the Arrhenius-like thermal dependence. The calculated apparent activation energy E{sub a} values are in good agreement with proton transport via the structural diffusion in absorbed water. However, at higher measuring temperatures an upturn of the electrical conductivity was observed to be dependent on the thermal history of the sample.
Authors:
; ; ; ;  [1]
  1. Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN, Avenida Prof. Lineu Prestes, 2242, São Paulo (SP) 05508000 (Brazil)
Publication Date:
OSTI Identifier:
22283068
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; COPOLYMERS; DIFFUSION; HUMIDITY; MEMBRANES; PROTON CONDUCTIVITY; PROTON TRANSPORT; TEMPERATURE DEPENDENCE; WATER