浸渍法制备VRB用ZrP/PE01复合膜

Impregnation preparing of ZrP/PE01 composite membrane for VRB

用浸渍法制备了磷酸锆(ZrP)/PE01复合膜。SEM、电子显微探针分析(EMPA)测试表明:复合膜的表面和内部都有α-ZrP沉积。在0.05 mol/L H2SO4中静态的质子导电性测试证实,复合膜/溶液界面双电层对质子传导具有重要影响。几种价态钒离子渗透率P的大小为:PE01>ZrP6/PE01>ZrP12/PE01>ZrP24/PE01。以PE01膜和ZrP24/PE01膜作为隔膜的全钒液流电池,在电流密度为30 mA/cm2、40 mA/cm2和50 mA/cm2时,库仑效率分别由90.19%、93.09%和94.06%提高到92.42%、94.35%和95.12%,能量效率分别由66.68%、66.09%和61.85%提高到68.01%、67.77%和64.01%。

Zirconium phosphate（ZrP）/PE01 composite membrane was prepared by impregnating method. SEM, electron microprobe analysis（EMPA） tests showed that α-ZrP deposited both on the surface and inner of composite membrane. The membrane/solution interface had great effect to proton transfer verified by the static proton conductivity test in 0.05 mol/L H2SO4.Diffusion permeability of vanadium ions decreased in the order of PE01 〉 ZrP6/PE01 〉 ZrP12/PE01 〉 ZrP24/PE01. Compared with PE01 membrane,coulombic efficiency of vanadium flow battery using ZrP24/PE01 composite membrane as membrane increased from 90.19% ,93.09% and 94.06% to 92.42% ,94.35% and 95.12% ,energy efficiency increased from 66.68% ,66.09% and 61.85% to 68.01% ,67.77% and 64.01% ,corresponding to the density of 30 mA/cm2 ,40 mA/cm2 and 50 mA/cm2 ,respeetively.