Coordination polymer glass from a protic ionic liquid: proton conductivity and mechanical properties as an electrolyte.

Chemical Science
Tomohiro OgawaSatoshi Horike

Abstract

High proton conducting electrolytes with mechanical moldability are a key material for energy devices. We propose an approach for creating a coordination polymer (CP) glass from a protic ionic liquid for a solid-state anhydrous proton conductor. A protic ionic liquid (dema)(H2PO4), with components which also act as bridging ligands, was applied to construct a CP glass (dema)0.35[Zn(H2PO4)2.35(H3PO4)0.65]. The structural analysis revealed that large Zn-H2PO4-/H3PO4 coordination networks formed in the CP glass. The network formation results in enhancement of the properties of proton conductivity and viscoelasticity. High anhydrous proton conductivity (σ = 13.3 mS cm-1 at 120 °C) and a high transport number of the proton (0.94) were achieved by the coordination networks. A fuel cell with this CP glass membrane exhibits a high open-circuit voltage and power density (0.15 W cm-2) under dry conditions at 120 °C due to the conducting properties and mechanical properties of the CP glass.

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Citations

Jul 21, 2021·Nano Letters·Satoshi HorikeMorten M Smedskjaer
Jul 22, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Kumar BiradhaSubhajit Saha
Oct 30, 2020·Journal of the American Chemical Society·Anastasia B AndreevaCarl K Brozek
Dec 3, 2021·Journal of the American Chemical Society·Remo N WidmerJohann Michler

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Methods Mentioned

BETA
X-ray
nuclear magnetic resonance
differential scanning calorimetry

Software Mentioned

FEFF

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