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Ultra-high proton/vanadium selectivity of a modified sulfonated poly(arylene ether ketone) composite membrane for all vanadium redox flow batteries

Ultra-high proton/vanadium selectivity of a modified sulfonated poly(arylene ether ketone) composite membrane for all vanadium redox flow batteries
Aziz, Md. AbdulShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issued Date
Article Type
All Vanadium Redox Flow BatteryBlock CopolymersCapacity RetentionComposite MembranesCopolymersCoulombic EfficiencyCrossover RatesElectric BatteriesEnergy EfficiencyEnergy StorageEthersExchange MembraneFlow BatteriesFuel CellsIon Selective MembranesIonsKetonesLithium CompoundsMembranesNafion MembraneOpen Circuit VoltageOxide CompositePendantPerformancePermeabilityPermeability RatePolyarylene Ether KetonesProton ConductivitySecondary BatteriesSolution Casting MethodVanadiumYarn
An ultra-high ion-selective membrane composed of an aromatic block copolymer sulfonated poly(arylene ether ketone) (SPAEK) and ZrO2 nanotubes (ZrNTs) is designed and fabricated via a solution-casting method. The composite membrane showed high proton conductivity and a reduced VO2+ crossover rate compared with a pristine SPAEK membrane. The SPAEK/ZrNT composite membrane exhibits a high proton conductivity and superior ion selectivity by reducing the crossover of vanadium ions during the long-term operation of an all vanadium redox flow battery (VRB). The VO2+ permeability rate of SPAEK/ZrNT is 0.09 × 10-7 cm2 min-1, which is 11- and 37-fold lower compared to that of the pristine SPAEK (1.0 × 10-7 cm2 min-1) and Nafion-212 (3.3 × 10-7 cm2 min-1) membranes, respectively. The VRB assembled with a SPAEK/ZrNT composite membrane showed a significantly lower self-discharge rate, retaining an open circuit voltage of 1.3 V for 500 h, compared to the pristine SPAEK (126 h) and Nafion-212 (29 h) membranes, indicating the superior ion selectivity of the composite membrane (6.6 × 106 S min cm-3), which is an 11- and 41-fold higher ion selectivity compared to that of the pristine SPAEK and Nafion-212 membranes, respectively. The SPAEK/ZrNT composite membrane exhibits a higher coulombic efficiency (CE, 99.86%) and energy efficiency (EE, 83.82%) at 40 mA cm-2, as compared to the pristine SPAEK (CE, 97.76% and EE, 81.56%) and Nafion-212 (CE, 89.65% and EE, 75.53%) membranes. The capacity retention of the SPAEK/ZrNT composite membrane is 93%, which is much higher than that of the SPAEK (72%) and Nafion-212 (38%) membranes after 100 VRB cycles. Moreover, the VRB with the SPAEK/ZrNT composite membrane maintains a stable cycling performance at different current densities, indicating the great potential of this separator as a substitute for the commercial Nafion membrane widely used in VRBs. © 2017 The Royal Society of Chemistry.
Royal Society of Chemistry
Related Researcher
  • 상가라쥬샨무감 Shanmugam, Sangaraju 에너지공학과
  • Research Interests Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
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Department of Energy Science and Engineering Advanced Energy Materials Laboratory 1. Journal Articles


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