Comparative Study on the Organic Solvent of IrO2–Ionomer Inks used for Spray Coating of Anode for Proton Exchange Membrane Water Electrolysis

Hye Young Jung, Yongseok Jun, Kwan Young Lee, Hyun S. Park, Sung Ki Cho, Jong Hyun Jang

Research output: Contribution to journalArticlepeer-review

Abstract

Currently, spray coating has attracted interest in the mass production of anode catalyst layers for proton exchange membrane water electrolysis (PEMWE). The solvent in the spray ink is a critical factor for the catalyst dispersion in ink, the microstructure of the catalyst layer, and the PEMWE performance. Herein, various pure organic solvents were examined as a substitute for conventional isopropanol-deionized water (IPA-DIW) mixture for ink solvent. Among the polar solvents that exhibited better IrO2 dispersion over nonpolar solvents, 2-butanol (2-BuOH) was selected as a suitable candidate. The PEMWE single cells were fabricated using 2-BuOH at various ionomer contents, spray nozzle types, and drying tem-peratures, and their performance was compared to the cells fabricated using a conventional IPA-DIW mixture. The PEMWE single cells with 2-BuOH solvent showed good performances comparable to the conventional IPA-DIW mixture case and highly durable performances under accelerated degradation tests.

Original languageEnglish
Pages (from-to)283-292
Number of pages10
JournalJournal of Electrochemical Science and Technology
Volume14
Issue number3
DOIs
Publication statusPublished - 2023 Aug

Bibliographical note

Publisher Copyright:
© 2023, Korean Electrochemical Society. All rights reserved.

Keywords

  • 2-butanol
  • Ink
  • Polymer electrolyte membrane water electrolysis
  • Pure organic solvent
  • Spray coating

ASJC Scopus subject areas

  • Electrochemistry

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