期刊
CHEMELECTROCHEM
卷 7, 期 4, 页码 937-945出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201901887
关键词
vanadium redox flow batteries; branched sulfonated polyimide; composite membrane; proton conductivity; cycling stability
资金
- National Natural Scientific Foundation of China [21878250, 21206138]
- Longshan Academic Talent Research Supporting Program of SWUST [17LZX402, 18LZX441]
- Doctoral Research Foundation of SWUST [18zx7133]
- Postgraduate Innovation Fund Project of SWUST [19ycx0013]
- Sichuan's Training Program of Innovation and Entrepreneurship for Undergraduate [S201910619053]
- Open Project of Sichuan Vanadium Titanium Industry Development Research Center [2018VTCY-Y-04]
A series of branched sulfonated polyimide (bSPI)/sulfonated methylcellulose (s-MC) composite membranes composed of a designed and synthesized bSPI polymer and functionalized s-MC are prepared by using a facile solution casting method for vanadium redox flow batteries (VRFBs). Among all bSPI/s-MC composite membranes, the optimized bSPI/s-MC-20 % composite membrane has the best proton selectivity of 2.45x10(5) S min cm(-3), which is 14.4 times as high as the Nafion 115 membrane. The bSPI/s-MC-20 % composite membrane possesses superior proton conductivity compared to most reported SPI-based composite membranes for VRFBs. The VRFB with a bSPI/s-MC-20 % composite membrane shows excellent battery efficiencies (CE=99.2-98.0 %, EE=66.3-77.6 %) and capacity retention (73.3-47.2 %). Moreover, the cost of the bSPI/s-MC-20 % composite membrane is only a quarter of that of a commercial Nafion 115 membrane. This work develops a new strategy to fabricate cheap bSPI-based composite membranes by introducing a suitable functionalized biomass material.
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