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Porous IrO2/Ti/IrO2 catalyst electrodes were obtained by coating IrO2 on three types of porous Ti powder sheets (sample 1, sample 2, and sample 3) using different surface treatment methods, and a hydrogen evolution catalyst electrode was obtained by coating Pt/C on carbon gas diffusion layers. A Nafion115 membrane was used as an electrolyte for the membrane electrode assemblies (MEA). Water electrolysis was investigated at cell temperatures up to 150 °C, and the electrical characteristics of the three types of porous IrO2/Ti/IrO2 catalyst electrodes were investigated. The sheet re-sistance of sample 1 was higher than those of samples 2 and 3, although during water electrolysis, a high current density was observed due to the nanostructure of the IrO2 catalyst. In addition, the structural stabilities of Nafion and Aquivion membranes up to 150 °C were investigated by using small angle X-ray scattering (SAXS). The polymer structures of Nafion and Aquivion membranes were stable up to 80 °C, whereas the crystalline domains grew significantly above 120 °C. In other words, the initial polymer structure does not recover after the sample is heated above the glass transition temperature.

Rights:

• Creative Commons BY Attribution 4.0 International
  

  Creative Commons BY Attribution 4.0 International

Keyword: polymer electrolyte, nafion membrane, porous IrO2/Ti/IrO2 catalyst electrode, water electrolysis, elevated temperature

Date published: 2021-04-30

Publisher: MDPI AG

Journal:

• Membranes (ISSN: 20770375) vol. 11 issue. 5 p. 330-330

Funding:

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

MDR DOI:

First published URL: https://doi.org/10.3390/membranes11050330

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Updated at: 2024-01-05 22:12:20 +0900

Published on MDR: 2023-03-03 11:07:00 +0900