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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Electrochemical and Mechanical Characteristics of Covalently Cross-Linked SPEEK Polymer Electrolyte Membrane for Water Electrolysis

수전해용 공유가교 SPEEK 고분자 전해질 막의 전기 화학적 및 기계적 특성

  • 김경언 (명지대학교 화학공학과 대학원) ;
  • 장인영 (명지대학교 화학공학과 대학원) ;
  • 권오환 (명지대학교 화학공학과 대학원) ;
  • 황용구 (명지대학교 화학공학과 대학원) ;
  • 문상봉 ((주)엘켐텍) ;
  • 강안수 (명지대학교 화학공학과 대학원)
  • Published : 2007.12.15
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Abstract

The covalently cross-linked sulfonated polyetheretherketone (CL-SPEEK) membrane was prepared by four-step synthesis of sulfonation-sulfochlorination, partial reduction, lithiation, and cross-linking, and its electrochemical and mechanical properties were investigated for water electrolysis application. The prepared ion exchange membranes showed good electrochemical and mechanical properties; proton conductivity of 0.116 S/cm at $80^{\circ}C$, water uptake of 44.6%, ion exchange capacity of 1.75 meq/g-dry-memb., tensile strength of 64.25 MPa and elongation of 61.11%. The membrane electrode assembly (MEA) with homemade membranes were prepared by non-equilibrium impregnation-reduction (I-R) method. Especially, the electrochemical surface area (ESA) and roughness factor of CL-SPEEK electrolyte by cyclic voltammetry method were 23.46 $m^2/g$ and 307.3 $cm^2-Pt/cm^2$, respectively. The prepared MEA was used in the unit cell of water electrolysis and the cell voltage was 1.81 V at 1 A/$cm^2$ and $80^{\circ}C$, with platinum loadings of 1.31 mg/$cm^2$.

Keywords

References

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