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Alkali resistant and conductive guanidinium-based anion-exchange membranes for alkaline polymer electrolyte fuel cells
被引:156
作者:
Lin, Xiaocheng
[1
]
Wu, Liang
[1
]
Liu, Yanbo
[1
]
Ong, Ai Lien
[2
]
Poynton, Simon D.
[2
]
Varcoe, John R.
[2
]
Xu, Tongwen
[1
]
机构:
[1] Univ Sci & Technol China, Sch Chem & Mat Sci, Lab Funct Membranes, CAS Key Lab Soft Matter Chem, Hefei 230026, Anhui, Peoples R China
[2] Univ Surrey, Fac Engn & Phys Sci, Dept Chem, Guildford GU2 7XH, Surrey, England
基金:
英国工程与自然科学研究理事会;
中国国家自然科学基金;
关键词:
Anion-exchange membrane fuel cells;
Guanidinium groups;
Alkali stability;
Ionic conductivity;
POLY(2,6-DIMETHYL-1,4-PHENYLENE OXIDE);
PERFORMANCE;
METHANOL;
IONOMER;
IMPEDANCE;
SERIES;
RESINS;
D O I:
10.1016/j.jpowsour.2012.05.062
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:
Novel alkaline anion-exchange membranes (AAEMs) containing pendant guanidinium groups are synthesized from poly(2, 6-dimethyl-1,4-phenylene oxide) (PPO) by benzyl bromination and subsequent reaction with 1,1,2,3,3-pentamethylguanidine (PMG). The performances of the resultant guanidinium-functionalized-PPO (GPPO) AAEMs are controlled by tailoring the amount of guanidinium groups in the membrane matrix. The AAEMs exhibit high ionic conductivities (up to 71 mS cm(-1) at room temperature): this stems from the high alkalinity (high pK(a)) of guanidinium hydroxide, which leads to an augmentation of both the number of dissociated hydroxides and water molecules. Furthermore, the GPPO AAEMs exhibit excellent thermal and alkali stabilities due to the presence of the pi electron conjugated systems of the pendant guanidinium head-groups permitting the positive charge to be delocalized over one carbon and three nitrogen atoms. Specifically, the initial decomposition temperatures, from thermogravimmetric analyses of the GPPO AAEMs. are high at 270 degrees C, while the hydroxide conductivity of the AAEM with the most optimal properties remains stable in aqueous KOH (1 mol dm(-3)) solution for 192 h at 25 degrees C. A H-2/O-2 fuel cell test at 50 degrees C with a GPPO AAEM yielded a beginning-of-life peak power density of 16 mW cm(-2). (C) 2012 Elsevier B.V. All rights reserved.
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页码:373 / 380
页数:8
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