Development of Hierarchically Porous Ionomer Membranes for Versatile and Fast Metal Ion Conduction.

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ID: 36326
2019
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Abstract
Innovative design concepts can play a key role in the realization of high-performance ionomer membranes that are capable of exclusive metal ion conduction and potentially applicable in electrochemical devices including sensors, fuel cells, and high-energy batteries. Herein, we report on the development of new ionomers, based on sulfonated poly(ether ether ketone) (SPEEK), engineered to conduct a variety of ions, namely, Li, Na, K, Zn, and Mg, when soaked with nonaqueous solvents. Application of a facile phase-inversion method results in M-SPEEK (M = Li/Na/K/Zn/Mg) membranes with a hierarchical porous network, facilitating organic solvent infusion that is necessary to promote dissociation and rapid transport of cations between anionic sulfonate groups on the polymer chains. This strategy leads to membranes with alkali ion conductivities approaching 10 S cm at room temperature, and near unity cation transference numbers ( ≥ 0.9). Furthermore, an exceptionally high Zn-ion conductivity of 10 S cm is obtained for the water-infused Zn-SPEEK membrane. In comparison, the dense membranes demonstrate 2-3 orders of magnitude lower conductivities because of insufficient solvent infusion. Preliminary electrochemical studies with solvent-infused ionomer membranes as the electrolyte look promising.
Reference Key
hnsel2019developmentacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Hänsel, Christian;Kundu, Dipan;
Journal ACS omega
Year 2019
DOI
10.1021/acsomega.8b03552
URL
Keywords Keywords not found

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