期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 46, 页码 26386-26392出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b09383
关键词
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资金
- U.S. National Science Foundation [CBET-1263860]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1545560, 1263860] Funding Source: National Science Foundation
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-chromium flow batteries as compared to the benchmark Nafion membrane. Findings of this research show that ionic microporous zeolite membranes can potentially overcome the challenge of trade-off between ion selectivity and conductivity associated with conventional polymeric ion separators.
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