期刊
CHEMSUSCHEM
卷 9, 期 17, 页码 2374-2379出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600468
关键词
alkali-stable; degradation mechanisms; hydroxide exchange membrane; phosphonium cation
资金
- MURI program of the ARO [W911NF-10-1-0520]
- ARPA-E program of the DOE [DE-AR-0000009]
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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