期刊
JOURNAL OF POWER SOURCES
卷 382, 期 -, 页码 22-29出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.02.025
关键词
Alkaline anion exchange membrane water electrolysis; Electrolyte feed method; Membrane electrode assembly; Binder content
资金
- Korean Government through the New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - MOTIE [20153010041750]
- Korea CCS R&D Center (KCRC) - MSIP [2014M1A8A1049349]
- National Research Foundation of Korea - MSIP [NRF-2015M1A2A2056554]
- KIST
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).
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