A new alkali-stable phosphonium cation based on fundamental understanding of degradation mechanisms
Zhang, Bingzi Kaspar, Robert B. Gu, Shuang Wang, Junhua Zhuang, Zhongbin Yan, Yushan
Zhang, Bingzi
Kaspar, Robert B.
Gu, Shuang
Wang, Junhua
Zhuang, Zhongbin
Yan, Yushan
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2016-09-08
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Article
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Alkali-stable,Degradation mechanisms,Hydroxide exchange membrane,Phosphonium cation
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B. Zhang, R. B. Kaspar, S. Gu, J. Wang, Z. Zhuang, Y. Yan, ChemSusChem 2016, 9, 2374
Abstract
Highly alkali-stable cationic groups are a critical component of hydroxide exchange membranes (HEMs). To search for such cations, we studied the degradation kinetics and mechanisms of a series of quaternary phosphonium (QP) cations. Benzyl tris(2,4,6-trimethoxyphenyl)phosphonium [BTPP-(2,4,6-MeO)] was determined to have higher alkaline stability than the benchmark cation, benzyl trimethylammonium (BTMA). A multi-step methoxy-triggered degradation mechanism for BTPP-(2,4,6-MeO) was proposed and verified. By replacing methoxy substituents with methyl groups, a superior QP cation, methyl tris(2,4,6-trimethylphenyl)phosphonium [MTPP-(2,4,6-Me)] was developed. MTPP-(2,4,6-Me) is one of the most stable cations reported to date, with <20% degradation after 5000h at 80 degrees C in a 1m KOD in CD3OD/D2O (5:1 v/v) solution.
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John Wiley & Sons, Inc.
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ChemSusChem;v.9:no.17
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1864-5631