用水溶性粘结剂聚乙烯醇(PVA)和α-LiAlO2粉料等制备熔融碳酸盐燃料电池水溶性隔膜(PVA隔膜).粉料的水合作用导致PVA隔膜的孔隙率和热失重均比PVB(聚乙烯醇缩丁醛)隔膜的大,但前者的最大孔径却比后者的小.当反应气压为0.9MPa,反应气体利用率为20%,分别于300和428.57mA·cm-2下放电时,PVA隔膜电池输出电压分别为0.849和0.739V;输出功率密度分别为254.7和316.7mW·cm-2,高于PVB隔膜电池的.经10次热循环启动,电池性能出现下降—回升—稳定的变化.这可能是PVA隔膜高温失水引起隔膜电导变化所致.
PVA matrix of MCFC was prepared from the α-LiAlO_(2 )powder, and polyvinylalcohol(PVA), Compared with the conventional PVB matrix, higher porosity,higher thermal weight loss and smaller maximum pore diameter were achieved for PVA matrix. Single cell was assembled with PVA matrix. At reaction gas pressure of 0.9MPa, under reaction gas utilization of 20%, at 300 and 428.57mA·cm~(-2), the cell voltage was 0.849 and (0.739) V respectively, and the output power density was 254.7 and 316.7mW·cm~(-2 )respectively, which are higher than those of the cell assembled with PVB matrix. During thermal cycles, the cell performance shows a slightly decreasing-rising-stabilizing process, which might be due to the conductivity variation of PVA matrix resulted from the losing of hydrated water in it at high temperatures.
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