期刊
JOURNAL OF MEMBRANE SCIENCE
卷 598, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2019.117674
关键词
Alkaline membrane; Polymer blend; Support electrolyte; Polysulfone; Water electrolysis
资金
- DTU Energy
- Danish Energy Agency via the EUDP program (Project: Boosting economic electricity storage (BEEST)) [EUDP17-1: 12542]
Development of thin, dense and robust alkaline polymer membranes with high hydroxide ion conductivity is key to advanced alkaline electrolysis as it can enable operation at higher current density and/or efficiency, while improving the dynamic response of the electrolyzer. In this work, a homogeneous blend membrane system based on poly(arylene ether sulfone) (PSU) and poly(vinylpyrrolidone) (PVP) is explored as an alkaline ion-solvating polymer matrix. Increasing PVP content in the blend drastically increases electrolyte uptake, and at PVP contents higher than 45 wt%, the membrane can support ion conductivity in a technologically relevant range of 10-100 mS cm(-1) or even higher when equilibrated in 20 wt% aqueous KOH. The membrane system is extensively characterized throughout the full composition range and the down-selected composition composed of 25% PSU and 75% PVP is employed in a single cell lab-scale water electrolyzer, showing excellent performance and stability during the course of one week at 500 mA cm(-2) at 60 degrees C in 20 wt% KOH. Good performance stability was demonstrated for more than 700 h at 80 degrees C, but the gradually increasing KOH concentration due to evaporative loss of water resulted in membrane degradation.
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