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Title: Water and methanol uptakes in Nafion membranes and membrane effects on direct methanol cell performance

Abstract

This paper compares direct methanol fuel cells (DMFCs) employing two types of Nafion{reg{underscore}sign} (E.I.DuPont de Nemours and Company) membranes of different equivalent weight (EW). Methanol and water uptakes in 1,100 and 1,200 EW Nafion membranes were determined by weighing P{sub 2}O{sub 5}-dried and methanol solution-equilibrated membranes. Both methanol and water uptakes in the 1,200 EW membrane were about 70--74% of those in the 1,100 EW membrane. The methanol crossover rate corresponding to that in a DMFC at open circuit was measured using a voltammetric method in the DMFC configuration and under the same cell operating conditions. After accounting for the thickness difference between the membrane samples, the methanol crossover rate through a 1,200 EW membrane was 52% of that through an 1,100 EW membrane. To resolve the cathode and anode performances in an operating DMFC, a dynamic hydrogen electrode was used as a reference electrode. Results show that in an operating DMFC the cathode can be easily flooded, as shown in a DMFC using 1,100 EW membrane. An increase in methanol crossover rate decreases the DMFC cathode potential at open circuit. At a high cell current density, the DMFC cathode potential can approach that of a H{sub 2}/air cell.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
OSTI Identifier:
20014489
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 1; Other Information: PBD: Jan 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; DIRECT METHANOL FUEL CELLS; PERFORMANCE; MEMBRANES; WATER; METHANOL; SORPTION; CATHODES; ANODES

Citation Formats

Ren, X, Springer, T E, and Gottesfeld, S. Water and methanol uptakes in Nafion membranes and membrane effects on direct methanol cell performance. United States: N. p., 2000. Web. doi:10.1149/1.1393161.
Ren, X, Springer, T E, & Gottesfeld, S. Water and methanol uptakes in Nafion membranes and membrane effects on direct methanol cell performance. United States. doi:10.1149/1.1393161.
Ren, X, Springer, T E, and Gottesfeld, S. Sat . "Water and methanol uptakes in Nafion membranes and membrane effects on direct methanol cell performance". United States. doi:10.1149/1.1393161.
@article{osti_20014489,
title = {Water and methanol uptakes in Nafion membranes and membrane effects on direct methanol cell performance},
author = {Ren, X and Springer, T E and Gottesfeld, S},
abstractNote = {This paper compares direct methanol fuel cells (DMFCs) employing two types of Nafion{reg{underscore}sign} (E.I.DuPont de Nemours and Company) membranes of different equivalent weight (EW). Methanol and water uptakes in 1,100 and 1,200 EW Nafion membranes were determined by weighing P{sub 2}O{sub 5}-dried and methanol solution-equilibrated membranes. Both methanol and water uptakes in the 1,200 EW membrane were about 70--74% of those in the 1,100 EW membrane. The methanol crossover rate corresponding to that in a DMFC at open circuit was measured using a voltammetric method in the DMFC configuration and under the same cell operating conditions. After accounting for the thickness difference between the membrane samples, the methanol crossover rate through a 1,200 EW membrane was 52% of that through an 1,100 EW membrane. To resolve the cathode and anode performances in an operating DMFC, a dynamic hydrogen electrode was used as a reference electrode. Results show that in an operating DMFC the cathode can be easily flooded, as shown in a DMFC using 1,100 EW membrane. An increase in methanol crossover rate decreases the DMFC cathode potential at open circuit. At a high cell current density, the DMFC cathode potential can approach that of a H{sub 2}/air cell.},
doi = {10.1149/1.1393161},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 1,
volume = 147,
place = {United States},
year = {2000},
month = {1}
}