Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Increased Chemical Durability by Annealing of SPEEK Membrane for Polymer Electrolyte Fuel Cells

고분자 전해질 연료전지용 SPEEK 막의 어닐링에 의한 화학적 내구성 향상

  • MI-HWA LEE (Depatment of Polymer Chemistry Chemical Engineering, Sunchon National University) ;
  • DONGGEUN YOO (Depatment of Chemical Engineering, Sunchon National University) ;
  • HYE-RI LEE (CNL Energy) ;
  • IL-CHAI NA (CNL Energy) ;
  • KWONPIL PARK (Depatment of Chemical Engineering, Sunchon National University)
  • 이미화 (국립순천대학교 고분자.화학.화학공학과) ;
  • 유동근 (국립순천대학교 화학공학과) ;
  • 이혜리 ((주)씨엔엘에너지) ;
  • 나일채 ((주)씨엔엘에너지) ;
  • 박권필 (국립순천대학교 화학공학과)
  • Received : 2023.11.21
  • Accepted : 2023.12.12
  • Published : 2023.12.30
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Abstract

Hydrocarbon-based polymer membranes to replace perfluorinated polymer membranes are being continuously researched. However, hydrocarbon-based membranes have a problem in that they are less durable than fluorine-based membranes. In this study, we sought to compare the annealing effect to improve the durability of sulfonated poly(ether ether ketone) (SPEEK). After membranes formation, thermogravimetric analysis and tensile strength were measured to compare changes in membranes properties due to annealing. After manufacturing the membrane and electrode assembly (MEA), the initial performance and chemical durability was compared with unit cell operation. During the 24-hour annealing process, the strength increased due to the increase in-S-O-S-crosslinking, and the sulfonic acid group decreased, leading to a decrease in I-V performance. By annealing, the hydrogen permeability was reduced to less than 1/10 of that of the nafion membrane, and as a result, open circuit voltage (OCV) and durability was improved. The SPEEK membranes annealed for 24 hours showed higher durability than the nafion 211 membranes of the same thickness.

Keywords

Acknowledgement

본 과제(결과물)는 2023년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학 협력기반 지역혁신 사업의 결과입니다(2021RIS-002).

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