Lee, Wonmi Konovalova, Anastasiia Tsoy, Ekaterina Park, Gyunho Henkensmeier, Dirk Kwon, Yongchai 2024-01-19T11:34:17Z 2024-01-19T11:34:17Z 2022-05-24 2022-07 0363-907X https://pubs.kist.re.kr/handle/201004/114923 In this study, the performance of alkaline aqueous organic redox flow battery (AORFB) using an isomeric mixture of 1,2-naphthoquinone-4-sulfonic acid sodium salt and 2-hydroxy-1,4-naphthoquinone (NQSO) and potassium ferrocyanide (FeCN) as active materials dissolved in potassium hydroxide (KOH) is enhanced with replacing commercial Nafion membrane with new crosslinked sulfonated polyphenylsulfone (crosslinked-SES) membrane. The optimal ratio of sulfonate and sulfone groups of the crosslinked-SES membrane is determined to balance between mechanical strength and ionic conductivity by the handling of curing time. With that, ionic conductivity and mechanical strength depending on the amount of sulfonate and sulfone are well balanced. The thickness of membrane is also optimized. Such optimized crosslinked-SES (crosslinked-SES24) membrane induces better mechanical stability and ionic conductivity than Nafion 211 (Young's modulus and in-plane conductivity of the potassium form of crosslinked-SES24 and Nafion 211 are 1108 and 214 MPa, and 20-23 and 7.8 mS center dot cm(-1)) with lower cost. In tests of AORFB using crosslinked-SES24 that is operated at a high current density of 200 mA center dot cm(-2) over 1000 cycles, the AORFB shows stable coulombic, voltage and energy efficiencies of 99.7, 65.3, and 65.0%, while its capacity loss rate is as low as 0.01% per cycle. English John Wiley & Sons Inc. Alkaline naphthoquinone-based redox flow batteries with a crosslinked sulfonated polyphenylsulfone membrane Article 10.1002/er.8079 1 International Journal of Energy Research, v.46, no.9, pp.12988 - 13002 International Journal of Energy Research 46 9 12988 13002 N scie scopus 000792877800001 Energy & Fuels Nuclear Science & Technology Energy & Fuels Nuclear Science & Technology Article ALL-VANADIUM COMPOSITE MEMBRANE ENERGY-STORAGE PERFORMANCE CELL ELECTROLYTES FERROCYANIDE TEMPERATURE TRANSPORT CAPACITY alkaline supporting electrolyte aqueous organic redox flow battery crosslinking mixed naphthoquinone sulfonated polyphenylsulfone membrane