期刊
JOURNAL OF POWER SOURCES
卷 448, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227358
关键词
vanadium redox flow battery; Cross-linked membrane; Conductivity; Vanadium permeability; Redox flow battery
资金
- Department of Science and Technology, Government of India [DST/TM/WTI/2K16/240(C)]
Herein, we report a novel synthesis of sulphonated poly(ether ether ketone) (SPK) grafted with 2,4,6-tris(dimethylaminomethyl)phenol (TAP) for preparation of amphoteric ion-exchange membrane (AIEM). Cross-linking has been achieved by using di-bromo alkane with different number of carbon chains (C6 & C10), and different AIEMs are assessed for vanadium redox flow battery (VRFB). These AIEMs are architected to contain -SO3H groups maintained conductivity, while -NH3+ groups for reduction in vanadium permeability with improve chargedischarge time via acid-base interactions, Structural and surface morphology of AIEMs have been elucidated by different spectral techniques (FTIR, H-1 NMR, SEM, and AFM). Cross-linking and acid-base interactions effectively reduced water uptake, swelling ratio, VO+2 permeability and improved ion-exchange capacity, conductivity, along with membrane stabilities. Due to good synergy between conductivity and VO+2 permeability, cross-linked AIEM with six number of carbon chains (CQSPK-6) exhibited higher Coulombic (CE: 98.4% vs 91.2%) and energy efficiency (81.4% vs similar to 76%) than Nafion 117 membrane at 60 mA cm(-2) in single cell VRFB. Further, CQSPK-6 AIEM maintained stable performance during in-sine cycle test (100 cycles) at 60 mA cm(-2). Hence, AIEM based on cross-linked SPK grafted with high molality of functional groups via side chain spacer is a promising candidate for an efficient VRFB system.
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