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Title: High temperature fuel cell membranes based on poly(arylene ether)s containing benzimidazole groups

Abstract

Development of new high-performance polymer membranes that retain their proton conductivity under low humidity conditions is one of the most critical requirements to commercialize PEMFC systems. Current sulfonated proton exchange membranes acquire proton conductivity by water that solvates ion and carries proton. Consequently, a loss of water under low RH conditions immediately results in a loss of proton conductivity. One approach to maintain proton conductivity under low RH conditions is to replace water with a less volatile proton solvent. Kreuer has pointed out the possibility to develop fully polymeric proton-conducting membranes based on nitrogen-containing heterocycles such as imidazole, benzimidazole, and pyrazole. We have attempted to blend those less volatile proton solvent with sulfonated copolymers such as polystyrene sulfonic acid, Nafion, poly(arylene ether sulfone, BPSH-xx). [Ref. DOE review meeting 2007 and 2008] However, we observed that imidazole was slowly sublimated out as temperature and humidity increases which could cause poisoning of electro-catalyst, corrosion and losing conductivity. In this presentation, we report the synthesis of novel poly(arylene ether sulfone)s containing benzimidazole groups These benzimidazole containing polymer was blended with sulfonated poly(arylene ether sulfone). In the blend system, benzimidazole group attached to the polysulfone acts as a medium through the basic nitrogen formore » transfer of protons between the sulfonic acid groups. Proton conductivity of the blend membranes was investigated as a function of water content at 80 C and compared the performance with water based proton conduction system.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2]
  1. Los Alamos National Laboratory
  2. CANADA
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
970584
Report Number(s):
LA-UR-09-05949; LA-UR-09-5949
TRN: US201002%%1295
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: 2009 Fuel Cell Seminar and Exposition ; November 16, 2009 ; Palm Springs, CA
Country of Publication:
United States
Language:
English
Subject:
36; BENZIMIDAZOLES; COPOLYMERS; CORROSION; ETHERS; FUEL CELLS; HUMIDITY; IMIDAZOLES; MEMBRANES; NITROGEN; POISONING; POLYMERS; POLYSTYRENE; PROTONS; SOLVENTS; SULFONIC ACIDS; SYNTHESIS

Citation Formats

Kim, Dae Sik, Kim, Yu Seung, Lee, Kwan - Soo, Boncella, James M, Kuiper, David, and Guiver, Michael D. High temperature fuel cell membranes based on poly(arylene ether)s containing benzimidazole groups. United States: N. p., 2009. Web.
Kim, Dae Sik, Kim, Yu Seung, Lee, Kwan - Soo, Boncella, James M, Kuiper, David, & Guiver, Michael D. High temperature fuel cell membranes based on poly(arylene ether)s containing benzimidazole groups. United States.
Kim, Dae Sik, Kim, Yu Seung, Lee, Kwan - Soo, Boncella, James M, Kuiper, David, and Guiver, Michael D. Thu . "High temperature fuel cell membranes based on poly(arylene ether)s containing benzimidazole groups". United States. https://www.osti.gov/servlets/purl/970584.
@article{osti_970584,
title = {High temperature fuel cell membranes based on poly(arylene ether)s containing benzimidazole groups},
author = {Kim, Dae Sik and Kim, Yu Seung and Lee, Kwan - Soo and Boncella, James M and Kuiper, David and Guiver, Michael D},
abstractNote = {Development of new high-performance polymer membranes that retain their proton conductivity under low humidity conditions is one of the most critical requirements to commercialize PEMFC systems. Current sulfonated proton exchange membranes acquire proton conductivity by water that solvates ion and carries proton. Consequently, a loss of water under low RH conditions immediately results in a loss of proton conductivity. One approach to maintain proton conductivity under low RH conditions is to replace water with a less volatile proton solvent. Kreuer has pointed out the possibility to develop fully polymeric proton-conducting membranes based on nitrogen-containing heterocycles such as imidazole, benzimidazole, and pyrazole. We have attempted to blend those less volatile proton solvent with sulfonated copolymers such as polystyrene sulfonic acid, Nafion, poly(arylene ether sulfone, BPSH-xx). [Ref. DOE review meeting 2007 and 2008] However, we observed that imidazole was slowly sublimated out as temperature and humidity increases which could cause poisoning of electro-catalyst, corrosion and losing conductivity. In this presentation, we report the synthesis of novel poly(arylene ether sulfone)s containing benzimidazole groups These benzimidazole containing polymer was blended with sulfonated poly(arylene ether sulfone). In the blend system, benzimidazole group attached to the polysulfone acts as a medium through the basic nitrogen for transfer of protons between the sulfonic acid groups. Proton conductivity of the blend membranes was investigated as a function of water content at 80 C and compared the performance with water based proton conduction system.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {1}
}

Conference:
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