Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 33, Pages 16248-16257Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.06.165
Keywords
High-temperature proton exchange membranes; Poly (arylene ether ketone); Imidazole; Stable proton conductivity
Categories
Funding
- Natural Science Foundation of China [51603017, 51673030]
- Jilin Provincial Science & Technology Department [20180101209JC, 20160520138JH, 20160519020JH]
- Chang Bai Mountain Scholars Program of Jilin Province
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The proton transport can be enhanced by properly controlling the chemical structure of side chains. In this work, polyelectrolytes supported on poly (arylene ether ketone), decorated with four kinds of nitrogen-heterocycles, were prepared as alternative materials for high-temperature proton exchange membrane (HT-PEM) applications. Particularly, the prominent basic alongside backbone makes positive imidazole group more effective than other three to promote phosphoric acid doping, enhance proton conductivity and avoid phosphoric acid leakage. The obtained BrPAEK-MeIm1.6 membranes (1.6 imidazole/unit), with PA doping level of 19.2 in 1 h acid absorption process, exhibited the conductivity of 0.091 S cm(-1) at 170 degrees C. Under harsh experimental conditions, membrane with higher imidazole exhibited relatively higher phosphoric acid retention ability (27% enhancement). The stability of proton conductivity has also been demonstrated, which indicates that the PA/BrPAEK-MeIm1.6 come to an equilibrium state with 77.7% of initial conductivity after 5 h. Then, there is almost negligible conductivity loss within 30 h. These results provide a basic understanding of nitrogen-heterocyclic addition and PA absorption and open up avenues for further research in this area. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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