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

Abstract

An ultra-high ion-selective membrane composed of aromatic block copolymer sulfonated poly(arylene ether ketone) (SPAEK) and ZrO2 nanotube (ZrNT) is designed and fabricated via a solution-casting method. The composite membrane showed high proton conductivity and reduced VO2+ crossover rate compared with a pristine SPAEK membrane. The high proton conductivity of SPAEK/ZrNT composite membrane exhibits a superior ion selectivity by reducing the crossover of vanadium ions during the long-term operation of 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-folds lower compared with 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 significant lower self-discharge rate, retaining an open circuit voltage of 1.3 V for 500 h compared to 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 11 and 41-folds higher ion selectivity compared to 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 pristine SPAEK (CE, 97.76% and EE, 81.56%) and Nafion-212 (CE, 89.65% and EE, 75.53%) membranes. The capacity retention of SPAEK/ZrNT composite membrane is 93%, which is much higher than SPAEK (72%) and Nafion-212 (38%) membranes after VRB 100 cycles. Moreover, the VRB with SPAEK/ZrNT composite membrane maintains a stable cycling performance at different current densities indicating the great potential separator as a substitute for the commercial Nafion membrane widely used in the VRB.

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Publication details

The article was received on 13 Jun 2017, accepted on 11 Jul 2017 and first published on 11 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA05155G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Ultra-high proton/vanadium selectivity of modified sulfonated poly(arylene ether ketone) composite membrane for all vanadium redox flow batteries

    Md. A. Aziz and S. Shanmugam, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05155G

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