期刊
POLYMERS
卷 10, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/polym10010102
关键词
zeolite composite; polymer electrolyte; ionic conductivity; direct alcohol fuel-cell performance
资金
- Ministry of Science and Technology [MOST 103-2221-E-182-064-MY3]
- Chang Gung University [BMRP 326]
Having a secure and stable energy supply is a top priority for the global community. Fuel-cell technology is recognized as a promising electrical energy generation system for the twenty-first century. Polyvinyl alcohol/zeolitic imidazolate framework-8 (PVA/ZIF-8) composite membranes were successfully prepared in this work from direct ZIF-8 suspension solution (0-45.4 wt %) and PVA mixing to prevent filler aggregation for direct methanol alkaline fuel cells (DMAFCs). The ZIF-8 fillers were chosen for the appropriate cavity size as a screening aid to allow water and suppress methanol transport. Increased ionic conductivities and suppressed methanol permeabilities were achieved for the PVA/40.5% ZIF-8 composites, compared to other samples. A high power density of 173.2 mW cm(-2) was achieved using a KOH-doped PVA/40.5% ZIF-8 membrane in a DMAFC at 60 degrees C with 1-2 mg cm(-2) catalyst loads. As the filler content was raised beyond 45.4 wt %, adverse effects resulted and the DMAFC performance (144.9 mW cm(-2)) was not improved further. Therefore, the optimal ZIF-8 content was approximately 40.5 wt % in the polymeric matrix. The specific power output was higher (58 mW mg(-1)) than most membranes reported in the literature (3-18 mW mg(-1)).
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