Proton conductivity of Nafion 117 as measured by a four-electrode AC impedance method

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1836625· OSTI ID:251056

Sone, Y; Ekdunge, P; Simonsson, D ^[1]

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1. Royal Inst. of Tech., Stockholm (Sweden)

Nafion 117{reg_sign} is a proton conducting ion-exchange membrane which is now receiving much attention due to its use as an electrolyte in the polymer-electrolyte-membrane fuel cell (PEMFC), which is of great interest for electric vehicle propulsion. The proton conductivity of Nafion 117 was measured under various conditions of humidity and temperature using a four-electrode ac impedance method. The conductivity of this membrane without heat-treatment was ca. 7.8 {times} 10{sup {minus}2} S/cm at ambient temperature and 100% relative humidity; it varied strongly with the humidity and heat-treatment of the membrane. After heat-treatment, the membrane showed a slight dependence of conductivity on temperature. From 21 to 45 C, its conductivity at a given relative humidity decreased with increasing temperature, while from 45 to 80 C it increased with temperature.

• Sponsoring Organization: USDOE
• OSTI ID: 251056
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 143; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
ELECTRIC CONDUCTIVITY
HEAT TREATMENTS
ION EXCHANGE MATERIALS
PERFORMANCE
SOLID ELECTROLYTE FUEL CELLS
SOLID ELECTROLYTES
WATER VAPOR