Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 4, Pages 3176-3185Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.11.219
Keywords
Amino-modified polybenzimidazole; Ethyl phosphoric acid; Graft; Phosphoric acid doping; Long-term stability
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Funding
- Natural Science Foundation of China [51603017, 21606225]
- Department of Science and Technology of Jilin Province [20180101209JC]
- Education Department of Jilin Province [JJKH20191286KJ]
- China Scholarship Council [201908220028]
- Changbai Mountain Scholars Program of Jilin Province
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A series of membranes based on amino-modified polybenzimidazole with grafted ethyl phosphonic acid have been successfully prepared. Firstly, the amino-modified polybenzimidazole (PBI-NH2-X) was synthesized, then the ethyl phosphoric acid (EPA) were grafted on to PBI-NH2-X to obtained amino-modified polybenzimidazoles with grafted ethyl phosphonic acid groups (PBI-NH2-EPA-X). EPA is introduced into the matrix to improve the H3PO4 doping level and proton conductivity of the membranes. The obtained membranes display good dimensional and thermal stability. Long-term stability of the grafted membranes is much better than the pristine PBI membranes. Moreover, PBI-NH2-EPA-15 shows a proton conductivity of 0.062 S cm(-1) at 170 degrees C, which is 342% higher than that of PBI. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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