期刊
JOURNAL OF MEMBRANE SCIENCE
卷 280, 期 1-2, 页码 802-808出版社
ELSEVIER
DOI: 10.1016/j.memsci.2006.02.037
关键词
Zn-air battery; Al-air battery; solid polymer electrolyte membrane; poly(vinyl alcohol); poly(acrylic acid)
High ionic conducting solid polymer electrolyte membranes (SPEM) had been successfully prepared from poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA). The solution casting method yielded highly hydrophilic membranes with uniform structure that were suitable for electrochemical applications. The room temperature ionic conductivity of the alkaline PVA/PAA polymer electrolyte membranes was in the range of 0.142-0.301 S cm(-1) depending on the composition. The cyclic voltammetry analysis was carried out using Zn vertical bar SPEM vertical bar Zn and Al vertical bar SPEM vertical bar Al cells. The analysis results revealed the excellent electrochemical stability of these newly developed alkaline solid PVA/PAA polymer electrolyte membranes. Metal-air fuel cells were also prepared from the alkaline solid PVA/PAA polymer electrolyte membranes. The electrochemical cell performance was evaluated based on Zn-air and Al-air cells at C/10 and C/5 discharge rates. The experimental results exhibited high percent of utilization for metal powders at room temperature. It was up to 90% for Zn-air cell when assembled with PVA:PAA = 10:7.5 polymer electrolyte membrane and discharged at 010 rate. The power density could be as high as 50 MW cm(-2) at room temperature. However, the cell percent utilization was reduced to 73% with the same composition electrolyte membrane when C/5 discharge rate was tested. (c) 2006 Elsevier B.V. All rights reserved.
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