Urushi/Nafion Hybrid Membranes for an All-Vanadium Redox Flow Battery
- Urushi/Nafion Hybrid Membranes for an All-Vanadium Redox Flow Battery
- 황승상; Jiyoon Jung; Eun Hae Cho; Jongok Won
- Issue Date
- VOL 3, NO 21-5777
- An urushi/Nafion hybrid membrane is prepared via a thermalin situ crosslinking reaction of natural urushiol to reduce thecrossover of vanadium ions in an all vanadium redox flowbattery (RFB). The ionic channel of the Nafion is blocked by theurushi, a crosslinked natural polymer formed by the polymer-ization of the adsorbed urushiol. Urushi, which has highchemical robustness in acid solution, is well-formed within thevolume of the ion cluster, and the presence of urushi inside theNafion membrane is confirmed. The permeability and swellingdecrease with increasing urushi in the hybrid membrane. TheRFB with a hybrid membrane has higher efficiency than theRFB with Nafion. The coulombic and energy efficiencies are95% and 91%, respec tively, for the membrane containing3.2 wt% of urushi at 11.1 mA cm？ 2, suggesting that the urushiin the hybrid membrane can suppress vanadium ion crossover.The chemical and mechanical strengths are maintained inFenton reagent, which enables long-term use of hybridmembranes to operate the RFB in strong acid solutions. Theseresults suggest that the urushi/Nafion membrane with achemically stable urushi inside the ion channel enables thesuccessful use of all vanadium RFB as an energy storagesystem
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