Alkaline anion exchange membrane water electrolysis: Effects of electrolyte feed method and electrode binder content

Title
Alkaline anion exchange membrane water electrolysis: Effects of electrolyte feed method and electrode binder content
Authors
김형준장종현헨켄스마이어디억유성종김진영박현서이소영박희영조민경이혜진임아연
Issue Date
2018-04
Publisher
Journal of power sources
Citation
VOL 382-29
Abstract
Herein, we investigate the effects of catholyte feed method and anode binder content on the characteristics of anion exchange membrane water electrolysis (AEMWE) to construct a high-performance electrolyzer, revealing that the initial AEMWE performance is significantly improved by pre-feeding 0.5  M aqueous KOH to the cathode. The highest long-term activity during repeated voltage cycling is observed for AEMWE operation in the dry cathode mode, for which the best long-term performance among membrane electrode assemblies (MEAs) featuring polytetrafluoroethylene (PTFE) binder– impregnated (5– 20  wt%) anodes is detected for a PTFE content of 20  wt%. MEAs with low PTFE content (5 and 9  wt%) demonstrate high initial performance, rapid performance decay, and significant catalyst loss from the electrode during long-term operation, whereas the MEA with 20  wt% PTFE allows stable water electrolysis for over 1600 voltage cycles. Optimization of cell operating conditions (i.e., operation in dry cathode mode at an optimum anode binder content following an initial solution feed) achieves an enhanced water splitting current density (1.07  A  cm− 2 at 1.8  V) and stable long-term AEMWE performance (0.01% current density reduction per voltage cycle).
URI
http://pubs.kist.re.kr/handle/201004/67416
ISSN
0378-7753
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