PVA-ZrP复合膜作为全钒液流电池隔膜的研究  

Research on PVA-ZrP composite membrane as separator in all vanadium redox flow battery

作　　者：桑商斌[1] 黄可龙[1] 石瑞成[2] 王小波[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]攀枝花钢铁研究院,四川攀枝花617000

出　　处：《中南大学学报（自然科学版）》2005年第6期1011-1016,共6页Journal of Central South University:Science and Technology

摘　　要：采用浇铸浸渍法制备了PVA-x%ZrP(磷酸锆)(x=10, 15, 20)复合膜. 采用红外光谱(IR)和差热分析(DTA)对膜进行表征. 考察复合膜在不同电流密度(0～70 mA/cm2)下的膜压降和对VO2+/VO+2离子的渗透性. IR研究结果表明, 复合膜中ZrP与PVA间产生相互作用, 使得PVA的微观结构发生变化. 复合膜在165～170 ℃之间出现强吸热峰, 这是由于磷酸锆脱去结晶水及PVA分子内脱去化学吸附水, 于220 ℃开始出现一个较强的放热峰, 表明PVA的分子内羟基缩合脱水和磷酸锆开始发生相变. 复合膜的膜压降除了与电解液硫酸浓度有关外, 还与其中的ZrP含量有关, ZrP含量增加, 膜压降也提高, 但离子选择性也增加, 表明复合膜由其微结构中的电解液导电逐步向ZrP导电过渡;所制备的复合膜中, PVA-15%ZrP具有较好的综合性能.PVA-x%ZrP（x= 10, 15, 20）composite and impregnating method. The characterization of membranes were prepared by a solution casting the membrane was made by infrared （IR） spestrum and differential thermal analysis （DTA）. The potential difference of the membrane in a current density range of 0-70 mA/cm^2 and its vanadium ions permeability were investigated. IR research shows that the microstructure transformation of PVA occurs as a result of the interaction between ZrP and PVA. The composite membrane presents a sharp endothermal peak at 165 - 170℃ as a result of the dehydration of lattice water in ZrP and the dehydration of chemical water adsorbed by hydroxyl in PVA, and an endothermal peak at 220 ℃ for the dehydroxylation of PVA and the phase transition of ZrP are also observed. Besides the concentration of H2SO4 in electrolyte, the membrane potential drop of the composite membrane is related with contents of ZrP. With the increase of ZrP content in the membrane, the membrane potential difference increases as well as its ion selectivity. The results show that proton transfer in the composite membrane experiences a transition from water in PVA microstructure to ion selective ZrP conductor. Among the prepared composite membrane, prehensive property. the PVA-15%ZrP membrane presents a better comprehensive property.

关 键 词：PVA—ZrP复合膜 离子选择性隔膜 全钒液流电池 

分 类 号：O631[理学—高分子化学]