프로톤 전도성 SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β 복합체 멤브레인의 수소투과 특성 (Hydrogen Permeation of SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β Proton-Conducting Ceramic Membranes)

서지정보

· 발행기관 : 한국수소및신에너지학회
· 수록지 정보 : 한국수소및신에너지학회논문집 / 22권 / 2호 / 161 ~ 167페이지
· 저자명 : 김환수, 유지행, 신민재

초록

Proton conductors have attracted considerable attention for solid oxide fuel cell (SOFC), hydrogen pump,gas sensor, and membrane separators. Doped SrCeO_3 exhibits appreciable proton conductivity in hydrogencontaining atmosphere at high temperature. However commercial realization has been hampered due to the reactivity of SrCeO_3 with CO_2. The chemical stability and proton conductivity are dependent on dopant type.
The purpose of this work is to investigate chemical stability of SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β composites in CO_2 and H_2 gases. Thermogravimetric analysis (TGA) was performed in gaseous CO_2 and electrical conductivity of the composites were also measured between 500 and 900℃ in air and H_2 atmosphere.
SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β composite membranes showed good chemical stability of in CO_2 atmosphere and high conductivity at hydrogen condition. The hydrogen permeation of SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-βcomposite membranes was investigated as a function of volumetric content of SrCe_0.95Gd_0.05O_3-α. The SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β(6:4) membrane with a thickness of 1.0 mm showed the highest hydrogen permeability with the flux reaching of 0.12 ml/min･cm^2 at 800℃ in 100%H_2/N_2 as feed gas.

영어초록

Proton conductors have attracted considerable attention for solid oxide fuel cell (SOFC), hydrogen pump,gas sensor, and membrane separators. Doped SrCeO_3 exhibits appreciable proton conductivity in hydrogencontaining atmosphere at high temperature. However commercial realization has been hampered due to the reactivity of SrCeO_3 with CO_2. The chemical stability and proton conductivity are dependent on dopant type.
The purpose of this work is to investigate chemical stability of SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β composites in CO_2 and H_2 gases. Thermogravimetric analysis (TGA) was performed in gaseous CO_2 and electrical conductivity of the composites were also measured between 500 and 900℃ in air and H_2 atmosphere.
SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β composite membranes showed good chemical stability of in CO_2 atmosphere and high conductivity at hydrogen condition. The hydrogen permeation of SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-βcomposite membranes was investigated as a function of volumetric content of SrCe_0.95Gd_0.05O_3-α. The SrCe_0.95Gd_0.05O_3-α-Ce_0.9Gd_0.1O_2-β(6:4) membrane with a thickness of 1.0 mm showed the highest hydrogen permeability with the flux reaching of 0.12 ml/min･cm^2 at 800℃ in 100%H_2/N_2 as feed gas.

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