Journal article
Poly(vinyl benzyl methylpyrrolidinium) hydroxide derived anion exchange membranes for water electrolysis
Northeastern University China1
Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark2
Department of Energy Conversion and Storage, Technical University of Denmark3
Electrochemical Materials, Department of Energy Conversion and Storage, Technical University of Denmark4
Developing anion exchange membranes (AEMs) with a long lifespan is a considerable challenge for the electrolyte material in the alkaline water electrolysis. Herein, the methylpyrrolidinium cation functionalized poly(vinyl benzyl chloride) (PVBC-MPy) membrane with high alkaline stability and ion conductivity simultaneously was synthesized through a facile, gentle and non-carcinogenic chemical method.
A poly(ether ketone-cardo) (PEK-cardo) polymer was blended with PVBC-MPy to provide sufficient mechanical robustness for integration and testing in AEM water electrolysis. The PVBC-MPy/x%PEK-cardo membranes showed excellent alkaline stability with no obvious degradation after immersing in 1 mol L−1 KOH at 60 °C and 80 °C for more than 500 h.
The PVBC-MPy/35%PEK-cardo membrane exhibited a good balance between high ion conductivity and mechanical strength, and was down-selected for electrolysis testing in 1 M KOH at 60 °C. The cell polarization curves of the AEM water electrolysis indicated that the membrane displayed good cell performance with a current density of 500 mA cm−2 at 2 V at 60 °C.
Moreover electrochemical impedance spectroscopy and the cell voltage lifetime test illustrated the feasibility of the membrane operating under mildly alkaline conditions.
Language: | English |
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Year: | 2019 |
Pages: | 17914-17922 |
ISSN: | 20507496 and 20507488 |
Types: | Journal article |
DOI: | 10.1039/c9ta04868e |
ORCIDs: | Kraglund, Mikkel Rykær and Aili, David |