Devising ultra-robust mixed-matrix membrane separators using functionalized MOF–poly(phenylene oxide) for high-performance vanadium redox flow batteries. Issue 20 (4th May 2022)

• Record Type: Journal Article
• Authors: Sharma, Prerana; Goswami, Ranadip; Neogi, Subhadip; Shahi, Vinod K.
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 20(2022)
• Page Start: 11150
• Page End: 11162
• Publication Date: 2022-05-04
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta10715a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Tailoring membrane surface via incorporation of ionic MOF mixed-matrix membrane separator for high VRFB performance. Abstract : Vanadium redox flow batteries (VRFBs) are promising candidates for the storage of renewable energy, and their performance and long-term durability depend on a core component: stable ion exchange membrane. We report the novel synthesis of a positively charged metal–organic framework (Cd-MOF, here designated as an ionic metal–organic framework (IMOF))-based hybrid polymer membrane with a functionalized backbone. The prepared structurally designed IMOF with fixed positive charges participates in electrostatic and hydrogen bonding interactions with quaternized poly(2, 6-dimethyl phenylene oxide) (QPM) to fabricate an IMOF@QPM membrane. A single-cell VRFB with the IMOF@QPM membrane exhibits outstanding performance, with a coulombic efficiency (CE) of 98.0%, a voltage efficiency (VE) of 91.0%, and an energy efficiency (EE) of 85.3% at 100.0 mA cm −2 . Furthermore, the IMOF@QPM membrane maintains a discharge capacity of ∼96.0% for up to 800 cycles, which surpasses the performance of commercial Nafion 117 (∼76.2% up to 400 cycles) at 100.0 mA cm −2 . These observations are attributed to the rationally designed architecture of the IMOF@QPM membrane as a preeminent vanadium ion barrier, with 2.32 × 10 −7 cm 2 min −1 permeability, 12.00 × 10 −2 S cm −1 conductivity, and 5.2 × 10 5 S min cm −2 ion selectivity along with good stability, showing overwhelming advantages over the Nafion® 117 membrane. The reported ultra-robust and high-performance IMOF-based super-cationic membrane may also find potential applications in water treatment and energy conversion devices.