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To improve the stability of high-temperature water electrolysis, I prepared membrane electrode assemblies (MEAs) using a decal method and investigated their water electrolysis properties. Nafion 115 and crosslinked sulfonated polyphenylsulfone (CSPPSU) membranes were used. IrO2 was used as the oxygen evolution reaction (OER) catalyst, and Pt/C was used as the hydrogen evolution reaction (HER) catalyst. The conductivity of the CSPPSU membrane at 80 ℃ and 90%RH (relative humidity) is about four times lower than that of the Nafion 115 membrane. Single-cell water electrolysis was performed while measuring the current density and performing electrochemical impedance spectroscopy (EIS) at cell temperatures from 80 to 150 °C and the stability of the current density over time at 120 °C and 1.7 V. The current density of water electrolysis using Nafion 115 and CSPPSU membranes at 150 ℃ and 2 V was 1.2 A/cm2 for both. The current density of the water electrolysis using the CSPPSU membrane at 120 ℃ and 1.7 V was stable for 40 hours. The decal method improved the contact between the CSPPSU membrane and the catalyst electrode, and a stable current density was obtained.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: High temperature, Polymer electrolyte water electrolysis, Nafion membrane, SPPSU polymer, CSPPSU membrane, Decal method, CCM

Date published: 2024-08-08

Publisher: MDPI AG

Journal:

• Membranes (ISSN: 20770375) vol. 14 issue. 8 173

Funding:

• Toyota Mobility Fund’s “Innovative Research Grant

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/membranes14080173

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Updated at: 2024-08-30 16:31:10 +0900

Published on MDR: 2024-08-30 16:31:10 +0900