作者:Yongping Zha、Melanie L. Disabb-Miller、Zachary D. Johnson、Michael A. Hickner、Gregory N. Tew
DOI:10.1021/ja211365r
日期:2012.3.14
Here we present the first metal-cation-based anion exchange membranes (AEMs), which were synthesized by copolymerization and cross-linking of a norbornene monomer functionalized with a water-soluble bis(terpyridine)ruthenium(II) complex and dicyclopentadiene. Each ruthenium complex has two associated counteranions, unlike most ammonium- and phosphonium-based membranes with single cation-anion pairs. The resulting AEMs show anion conductivities and mechanical properties comparable to those of traditional quaternary-ammonium-based AEMs as well as good alkaline stability and methanol tolerance. These results suggest that metal-cation-based polymers hold promise as a new class of materials for anion-conducting applications.
Thermodynamics of Counterion Release Is Critical for Anion Exchange Membrane Conductivity
作者:Michael T. Kwasny、Liang Zhu、Michael A. Hickner、Gregory N. Tew
DOI:10.1021/jacs.8b03979
日期:2018.6.27
association was further exemplified by characterizing more traditional AEM cations, such as quaternary ammoniums and an imidazolium cation, which demonstrated small variances in their enthalpic response, but an overall Δ Htot similar to that of the nickel-based cation. The cationhydration, rather than its hydration shell or the bulk hydration of the membrane, likely played the key role in determining the strength