Two‐Dimensional MFI‐Type Zeolite Flow Battery Membranes

Abstract

Vanadium flow battery (VFB) is one of the most reliable stationary electrochemical energy‐storage technologies, and a membrane with high vanadium resistance and proton conductivity is essential for manufacturing high‐performance VFBs. In this study, a two‐dimensional (2D) MFI‐type zeolite membrane was fabricated from zeolite nanosheet modules, which displayed excellent vanadium resistance (0.07 mmol L‐1 h‐1) and proton conductivity (0.16 S cm‐1), yielding a coulombic efficiency of 93.9%, a voltage efficiency of 87.6%, and an energy efficiency of 82.3% at 40 mA cm‐2. The self‐discharge period of a VFB equipped with 2D MFI‐type zeolite membrane increased up to 116.2 h, which was significantly longer than that of the commercial perfluorinated sulfonate membrane (45.9 h). Furthermore, the corresponding battery performance remained stable over 1000 cycles (> 1500 h) at 80 mA cm‐2. These findings demonstrate that 2D MFI‐type membranes are promising ion‐conductive membranes applicable for stationary electrochemical energy‐storage devices.

High-Light-Transmittance and Low-Haze Antifog MFI Zeolite Films Fabricated by Solvothermal Secondary Growth

“…The manipulation of MFI film structure, especially b -axis preferred orientation ( b -axis perpendicular to the film substrate), has attracted extensive research interest because different microstructures exert significant impacts on its separation or ion-conductive performance. − Various approaches such as silica resource-controlled releasing, single-mode microwave heating, and adding crystallization-mediating agents were developed to prepare high-quality b -oriented MFI zeolite films. − For the antifogging application, however, a strong hydrophilicity of the film surface is also highly desired.…”

ZSM‐5 zeolite incorporated flow battery membranes with regulated pore channels for high proton conduction

“…1 Currently, microporous framework materials possessing rigid well-defined microporous structure, 2 such as metal organic framework (MOF), 3 covalent organic framework (COF), 4 and zeolite 5 are promising materials employed to prepare ICMs for fuel cell and flow battery. 6 Among these microporous materials, ZSM-5 is an aluminosilicate porous zeolite composed of TO 4 (T = Si 4+ , Al 3+ ) tetrahedral primary units (Figure S1), 7 whose hydrophilic property on the surface could reduce the resistance to the entry of protons into the pore, 8 and the internal interconnected sub-nanometer pores may allow fast proton transport, 9 showing tremendous potential for the development of the high-performance ICM. 10 In our previous study, we successfully prepared pure ZSM-5 zeolite membrane, demonstrating fast proton transport through the hydrophilic zeolitic pores.…”