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Stable and Highly Ion Selective Membrane Made from Cellulose Nanocrystal for Aqueous Redox Flow Batteries.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Stable and Highly Ion Selective Membrane Made from Cellulose Nanocrystal for Aqueous Redox Flow Batteries."

The design of chemically stable ion exchange membranes with high selectivity for application in aqueous redox flow battery (RFB) at high acid concentration remains a significant challenge. Herein, this study designed a stable and highly ion selective membrane by utilizing proton conductive cellulose nanocrystals (CNCs) incorporated in semicrystalline hydrophobic poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix. The high hydrophobicity of the PVDF-HFP matrix mitigates crossover of the electrolytes, whereas, the abundant and low-cost CNCs derived from wood provides high proton conductivity. The fundamental contributors for CNCs' excellent proton conductivity are the hydroxyl (-OH) functional groups, highly acidic sulfonate (-SO3H) functional groups, and the extensive intramolecular hydrogen bonding network. In addition, CNCs exhibit mechanically and chemically stable structure in the harsh acidic electrolyte attributed to the high crystallinity (crystalline index of ~86 %). Therefore, because of the high proton conductivity, excellent ion selectivity, high chemical stability, and structural robustness, the vanadium redox flow battery (VRFB) assembled with homogeneous CNCs and PVDF-HFP (CNC/PVDF-HFP) membrane achieved a coulombic efficiency (CE) of 98.2 %, energy efficiency (EE) of 88.2 %, and a stable cycling performance for more than 650 cycles at a current density of 100 mA cm-2. The obtained membrane possess excellent flexibility, high mechanical tensile strength, and superior selectivity. Meanwhile, the applied casting method is scalable for large scale manufacturing.

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This article was published in the following journal.

Name: Nano letters
ISSN: 1530-6992
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