• Title/Summary/Keyword: Oxidative durability

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Research of Characterization of Covalently Cross-linked SPEEK/Cs-Substituted MoPA/Ceria 1wt% Composite Membrane for Water Electrolysis (Cs 치환에 따른 수전해용 공유가교 SPEEK/Cs(n)-MoPA/Ceria 1%(n = 1~3) 복합막의 특성 연구)

  • Park, Daeyoung;Hwang, Sungha;Oh, Seunghee;Yoon, Daejin;Kang, Ansoo;Moon, Sangbong;Chung, Janghoon
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.1
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    • pp.1-10
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    • 2014
  • Ceria ($CeO_2$) was used to scavenge free radicals which attack the membrane in the polymer electrolyte membrane water electrolysis (PEMWE) circumstance and to increase the duration of the membrane. In order to improve the electrochemical, mechanical and electrocatalytic characteristics, engineering plastic of the sulfonated polyether ether ketone (SPEEK) as polymer matrix was prepared in the sulfonation reaction of polyether ether ketone (PEEK) and the organic-inorganic blended composite membranes were prepared by sol-gel casting method with loading the highly dispersed ceria and cesium-substituted phophomolybdic acid(Cs-MoPA) with cross-linking agent contents of 0.01mL. In conclusion, CL-SPEEK/$Cs_{(2.5)}$-MoPA/ceria(1%) membrane showed the optimum results such as 0.1095S/cm of proton conductivity at $80^{\circ}C$, 2.906meq./g-dry-membrane of ion exchange capacity and mechanical characteristics, and 49.73MPa of tensile strength which were better than Nafion 117 membrane.

An Experimental Study on the FMEA Evaluation of Non-metallic Materials in High-Pressure Hydrogen Facility (고압 수소설비용 비금속부품 소재의 FMEA 평가를 통한 실험적 연구)

  • Ahn, Jeongjin;Kim, Wanjin;Kim, Laehyun
    • Journal of Energy Engineering
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    • v.28 no.3
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    • pp.10-17
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    • 2019
  • According to South Korea's policy of supplying eco-friendly hydrogen vehicles, related industries are actively conducting research on the development of hydrogen cars and hydrogen charging station infrastructure. On the other hand, there is a lack of empirical research and assessment of the risk of non-metallic materials (such as liners, seals, gaskets) for classified materials that directly affect the durability and reliability of hydrogen vehicles and hydrogen charging stations. In this study, the risk factors for liners and seals of non-metallic parts used in high-pressure hydrogen installations were derived using FMEA, and the RPN values were calculated by converting the severity, frequency of occurrence and degree of detection into scores. The maximum value of the RPN 600, minimum value 63, average value 278.5 was calculated and periodic control of the liner and seal was identified as important. In addition, through hydrogen soakage and oxygen aging tests for non-metallic rubber products, physical test values that can be used as basic data were presented.