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Eutectic CsHSO4-Coordination Polymer Glasses with Superprotonic Conductivity.

Nattapol Ma1, Nao Horike2, Loris Lombardo2

  • 1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.

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This summary is machine-generated.

We developed a novel CsHSO4-based glass system that enables superprotonic conductivity below 141 °C. This breakthrough offers highly conductive, processable, and transparent proton conductors for advanced applications.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Superprotonic phase transition in cesium hydrogen sulfate (CsHSO4) enables fast protonic conduction but requires temperatures above 141 °C.
  • Existing CsHSO4 materials are limited by their high operating temperature and lack of processability.
  • Developing solid proton conductors that operate efficiently at lower temperatures and are easily fabricated is crucial for technological advancements.

Purpose of the Study:

  • To create a CsHSO4-based material with preserved superprotonic conductivity at temperatures below its transition point.
  • To enhance the processability of CsHSO4 for easier device fabrication.
  • To investigate the structural origins of the enhanced proton conductivity in the new material system.

Main Methods:

  • Formation of a binary CsHSO4-coordination polymer glass system exhibiting eutectic melting.
  • Measurement of anhydrous proton conductivities across a range of temperatures.
  • Characterization using solid-state Nuclear Magnetic Resonance (NMR) and X-ray pair distribution functions.
  • Assessment of material viscosity and thin-film properties (resistivity, transparency).

Main Results:

  • The CsHSO4-glass system exhibits anhydrous proton conductivities below 141 °C that are over three orders of magnitude higher than pristine CsHSO4.
  • The material maintains high conductivity at elevated temperatures (6.3 mS cm⁻¹ at 180 °C) without humidification.
  • Achieved processable viscosity (<10³ Pa·s) at a low temperature of 65 °C.
  • Structural analysis revealed oxyanion exchange as the key to preserved conductivity.
  • Demonstrated preparation of micrometer-scale thin-film proton conductors with low resistivity and high optical transparency (>85% between 380-800 nm).

Conclusions:

  • The developed CsHSO4-coordination polymer glass system successfully preserves superprotonic conductivity below its transition temperature.
  • This material offers a unique combination of high proton conductivity, low-temperature processability, and optical transparency.
  • The findings pave the way for fabricating advanced, efficient, and versatile solid-state proton conductors for various applications.