Cited 4 time in webofscience Cited 5 time in scopus

Sulfonated graphene oxide-decorated block copolymer as a proton-exchange membrane: Improving the ion selectivity for all-vanadium redox flow batteries

Sulfonated graphene oxide-decorated block copolymer as a proton-exchange membrane: Improving the ion selectivity for all-vanadium redox flow batteries
Aziz, Md. AbdulShanmugam, Sangaraju
DGIST Authors
Shanmugam, Sangaraju
Issue Date
Journal of Materials Chemistry A, 6(36), 17740-17750
Article Type
Block copolymersChemical stabilityElectric dischargesEnergy efficiencyFlow batteriesGrapheneIon exchangeIonsKetonesMembranesOpen circuit voltageVanadiumAll vanadium redox flow batteryBattery performanceCoulombic efficiencyElectrochemical performanceIon selectivityProton exchange membranesProton-exchange composite membranesVanadium ion permeabilitiesComposite membranes
We describe the fabrication of a new block copolymer, sulfonated poly(ether ketone sulfone) (SPEKS) decorated with sulfonated graphene oxide (sGO) as a potential proton-exchange composite membrane for all-vanadium redox flow batteries (VRBs). The simple design of the SPEKS/sGO composite membrane offers key advantages in VRBs relative to commercial Nafion® membrane. The SPEKS/sGO composite membrane exhibited significantly lower vanadium ion permeability, which resulted in an excellent ion selectivity (10.2 × 105 S min cm-3) in comparison with the pristine SPEKS (7.9 × 105 S min cm-3) and Nafion-212 (1.8 × 105 S min cm-3) membranes. As a result, the SPEKS/sGO composite membrane exhibited exceptional electrochemical performance in a VRB under a mixed-acid system. Further, the impressive cyclability with negligible capacity decay demonstrated the high chemical stability of the designed composite membrane for long-term operation. In addition, excellent battery performance with a Coulombic efficiency of 99.4% and energy efficiency of 82.5% was obtained for the SPEKS/sGO membrane compared with the Nafion-212 (CE, 89.6% and EE, 75.5%) and the pristine SPEKS (CE, 97.2% and EE, 74.7%) membranes in the VRB at 40 mA cm-2 current density. The VRB assembled with a SPEKS/sGO composite membrane had a lower self-discharge rate, retaining an open circuit voltage of 1.30 V for 395 h in comparison with the Nafion-212 (29 h) and pristine SPEKS (240 h) membranes. Therefore, given its remarkable electrochemical performance and improved chemical stability, the SPEKS/sGO composite membrane has good potential to be explored as a promising alternative for the Nafion® membrane currently extensively used in VRB applications. © 2018 The Royal Society of Chemistry.
Royal Society of Chemistry
Related Researcher
  • Author Shanmugam, Sangaraju Advanced Energy Materials Laboratory
  • Research Interests Electrocatalysts for fuel cells; water splitting; metal-air batteries; Polymer electrolyte membranes for fuel cells; flow batteries; Hydrogen generation and utilization
There are no files associated with this item.
Department of Energy Science and EngineeringAdvanced Energy Materials Laboratory1. Journal Articles

qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.