Proton-Selective Ion Transport in ZSM-5 Zeolite Membrane
By Xu, Zhi; Michos, Ioannis; Cao, Zishu; Jing, Wenheng; Gu, Xuehong; Hinkle, Kevin; Murad, Sohail; Dong, Junhang
Published in The Journal of Physical Chemistry C
2016
Abstract
The ionic ZSM-5 zeolite membranes were investigated for proton-selective ion separation in electrolyte solutions relevant to redox flow batteries. The zeolite membrane achieved exceptional selectivity for proton over V4+ (VO2+), Cr2+, and Fe2+ via size-exclusion at the zeolitic channel openings, and remarkably low area specific resistance resulted from its hydrophilic surface, copious extraframework protons, and micron-scale thickness. The ZSM-5 membrane, as a new type of ion separator, demonstrated substantially reduced self-discharge rates and enhanced efficiencies for the all-vanadium and iron
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