Journal
ACS ENERGY LETTERS
Volume 6, Issue 1, Pages 184-192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c02089
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Funding
- KAIST Institute for the NanoCentury
- KRICT Core Research Program - Korea Research Council for Industrial Science and Technology, South Korea [SKO1920-10]
- Hydrogen Energy Innovation Technology Development Program of the National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT (MSIT)) [NRF-2019M3E6A1064729]
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The study developed an ultrathin PFSA membrane with highly aligned ion channels of reduced size, dramatically improving ion selectivity in vanadium redox flow batteries.
In vanadium redox flow batteries (VRFBs), a perfluorinated sulfonic acid (PFSA) ionomer membrane plays a crucial role in transporting ions through hydrophilic channels. However, its randomly interconnected channels with relatively large size in a hydrated state cause low proton/vanadium ion selectivity, imposing a limitation in enhancing performance of VRFB. Herein, we develop an ultrathin PFSA membrane of highly aligned ion channels with reduced size, by molecular arrangement on the air/water interface. Well-ordered ion channels dramatically suppress the vanadium ion crossover, enhancing 500-fold in the ion selectivity compared to conventional PFSA membranes. The molecularly controlled ultrathin PFSA membranes exhibit stable cell performance on a porous support over various current densities and long-term cycles (800 cycles), exceeding the energy efficiency of Nafion 211 (73%) at 200 mA/cm(2). Highly ordered ultrathin PFSA membranes with high ion selectivity could offer a practically applicable low-cost, yet high-performance membrane for VRFBs.
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