Hsu P.-Y.Hu T.-Y.Kumar S.R.Chang C.-H.Wu K.C.Tung K.-L.2019-05-172019-05-17201820734360https://scholars.lib.ntu.edu.tw/handle/123456789/408827Having 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 ¢XC 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 ). ? 2018 by the authors.Direct alcohol fuel-cell performanceIonic conductivityPolymer electrolyteZeolite composite[SDGs]SDG7journal article10.3390/polym100101022-s2.0-85044825538https://www.scopus.com/inward/record.uri?eid=2-s2.0-85044825538&doi=10.3390%2fpolym10010102&partnerID=40&md5=e30587996e27f81e8d2023d5fc58bff3