A strategy for facile durability improvement of perfluorosulfonic electrolyte for fuel cells: Counter ion-assisted decarboxylation at elevated temperatures

被引：12

作者：

Cheng, Yuting ^{[1
]}

Tang, Haolin ^{[1
]}

Pan, Mu ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2012年 / 198卷

关键词：

Perfluorosulfonic acid; Chemical durability; Decarboxylation; Temperature; Counter ion; PROTON-EXCHANGE MEMBRANE; SPIN-TRAPPING ESR; CHEMICAL DEGRADATION; MODEL COMPOUNDS; ACID; PERFORMANCE; STABILITY; NAFION; MITIGATION; RADICALS;

D O I：

10.1016/j.jpowsour.2011.10.021

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：

A strategy for improving the chemical stability of perfluorosulfonic acid is proposed by hydrothermal decarboxylation of defect groups with the assistance of counter ions and ethylene glycol at elevated temperatures. An apparent decrease in the carboxyl end groups is observed at decarboxylation temperatures of 180-220 degrees C. Decarboxylation of perfluorosulfonic acid significantly improves the chemical stability of the perfluorosulfonic electrolyte toward hydroperoxyl radicals, resulting in high concentrations of S-2p and F-1s after radical corrosion for 12h. The decarboxylation of the electrolyte at elevated temperature also improves the side chain stability of the perfluorosulfonic acid. The fluoride emission rate decreases with increased decarboxylation temperature, implying a low side chain cleavage of the perfluorosulfonic acid polymer. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：190 / 195

页数：6

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