MOF‐801 polycrystalline membrane with sub‐10 nm polymeric assembly layer for ion sieving and flow battery storage

Abstract

Molecular sieving metal–organic framework (MOF) polycrystalline membranes have great potential for ion sieving and are desirable as efficient separators for devices of energy storage such as flow battery. Herein, we report a continuous MOF‐801 polycrystalline membrane with an ultrathin polymeric assembly layer (less than 10 nm) for the vanadium flow battery (VFB). Owing to the precise sub‐nanometer sieving pores and abundant H‐bond networks in MOF‐801 frameworks, the membrane exhibited better H/V selectivity (up to 194) and conductivity (about 0.028 S/cm) than commercial Nafion‐117 membrane (H/V selectivity: ~9.5, conductivity: 0.017 S/cm). VFB results revealed that a cell with above MOF polycrystalline membrane showed high coulombic efficiency (CE: 96.1%) and excellent energy efficiency (EE: 83.2%) at 20 mA/cm2, which was much comparable to Nafion membrane. This work demonstrates that MOF polycrystalline membrane is a promising candidate as ion sieving membrane for energy technique.

Zr-MOF-Based Enzyme Mimic Catalytic Membrane for Removal of Organophosphorus Pesticides

“…In another sample, nanofibers of the enzyme mimic containing the proteases’ active sites were developed and used to functionalize the substrate membrane to prepare an enzyme mimic-functionalized membrane to effectively degrade di(2-ethylhexyl) phthalate (DEHP, a plasticizer) . To date, MOFs have also been combined with a membrane matrix to obtain better separation performance. − The combination of the membrane and MOFs is creative and beneficial to improve the removal performance by the coupling of separation and catalysis. However, the MOF-based enzyme mimic catalytic membrane that immobilizes the enzyme mimic to the membrane has not been reported for organophosphorus pesticide removal.…”

Fish‐scale‐like nano‐porous membrane based on zeolite nanosheets for long stable zinc‐based flow battery

“…Nowadays, energy storage technologies, including pumped‐hydro, 1 compressed air, 2 and electrochemical energy storage, 3–5 are more and more necessary to improve the utilization efficiency of renewable energy 6 . Among them, flow batteries have been considered to be one of the most suitable technologies for large‐scale energy storage 7–12 . Particularly, the emerging aqueous zinc‐based flow batteries 13–17 (ZFBs) have attracted extensive interest of researchers in recent, owing to the high energy density, long cycle life, safety and environmental friendliness 18 .…”

“…6 Among them, flow batteries have been considered to be one of the most suitable technologies for large-scale energy storage. [7][8][9][10][11][12] Particularly, the emerging aqueous zinc-based flow batteries [13][14][15][16][17] (ZFBs) have attracted extensive interest of researchers in recent, owing to the high energy density, long cycle life, safety and environmental friendliness. 18 However, the uneven zinc plating/stripping process during the charge/discharge cycles causes serious dendrite problem, which is known as one of the most critical challenges for ZFBs.…”

Functional molecular cross‐linked zeolite nanosheets heighten ion selectivity and conductivity of flow battery membrane

“…As a pivotal large‐scale energy storage technology to tackle the intermittency and instability of renewable energy, vanadium flow battery (VFB) has attracted wide attention for the advantages of long lifetime, flexible design, high safety, and high efficiency 1–4 . The proton conductive membrane is an important component in flow battery to separate the anode and cathode to prevent short circuits, and meanwhile conduct protons to achieve a complete circuit 5–7 . To date, the perfluorinated membranes (e.g., Nafion) are still the most widely used proton conductive membrane, while the low selectivity and high cost greatly impede their further development 8,9 .…”

“…[1][2][3][4] The proton conductive membrane is an important component in flow battery to separate the anode and cathode to prevent short circuits, and meanwhile conduct protons to achieve a complete circuit. [5][6][7] To date, the perfluorinated membranes (e.g., Nafion) are still the most widely used proton conductive membrane, while the low selectivity and high cost greatly impede their further development. 8,9 Therefore, it is crucial to develop economy membranes with high ion selectivity and conductivity toward the large-scale energy storage system.…”