Conductivity and chemical stability of SrCe_(0.92)Nb_(0.03)Tm_(0.05)O_(3-δ) membrane prepared by modified sol-gel method  

Conductivity and chemical stability of SrCe_(0.92)Nb_(0.03)Tm_(0.05)O_(3-δ) membrane prepared by modified sol-gel method

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作  者:Wen Hui Yuan Chun Shan Dong Li Li 

机构地区:[1]School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China [2]College of Environmental Science and Engineering,South China University of Technology,Guangzhou 510640,China

出  处:《Chinese Chemical Letters》2012年第8期957-960,共4页中国化学快报(英文版)

基  金:supported by Joint Funds of NSFC-Guangdong (No. U0834004);NSFC (No. 20976057);Guangdong Provincial Natural Science Funding (No. 06025657)

摘  要:SrCe0.92 Nb 0.03 Tm0.05 O 3-δ powders were synthesized by a modified sol-gel method using citrate as a chelating agent.X-ray diffraction(XRD) analysis verified SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ powders and membranes consisting of a single perovskite phase.The morphologies of the sintered membranes were investigated by using scanning electron microscopy(SEM) technique.Stability tests demonstrated that the Nb introduction into doped strontium cerate greatly enhanced the chemical stability.Electrical conductivities of SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ and SrCe 0.95 Tm 0.05 O 3-δ were measured by the four-point DC method under 10% H 2 /He atmosphere and temperatures(700-900℃).With a maximum conductivity of 0.0067 S cm^-1 at 900℃,the total electrical conductivity of SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ increases with increasing temperature.The H 2 permeation flux of SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ is 0.035 mL cm-2 min-1 when 40% H 2 /He and Ar were used respectively as the feed and sweeping gases at 900℃.SrCe0.92 Nb 0.03 Tm0.05 O 3-δ powders were synthesized by a modified sol-gel method using citrate as a chelating agent.X-ray diffraction(XRD) analysis verified SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ powders and membranes consisting of a single perovskite phase.The morphologies of the sintered membranes were investigated by using scanning electron microscopy(SEM) technique.Stability tests demonstrated that the Nb introduction into doped strontium cerate greatly enhanced the chemical stability.Electrical conductivities of SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ and SrCe 0.95 Tm 0.05 O 3-δ were measured by the four-point DC method under 10% H 2 /He atmosphere and temperatures(700-900℃).With a maximum conductivity of 0.0067 S cm^-1 at 900℃,the total electrical conductivity of SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ increases with increasing temperature.The H 2 permeation flux of SrCe 0.92 Nb 0.03 Tm 0.05 O 3-δ is 0.035 mL cm-2 min-1 when 40% H 2 /He and Ar were used respectively as the feed and sweeping gases at 900℃.

关 键 词:Strontium cerate Chemical stability NIOBIUM Electrical conductivity 

分 类 号:TN304.25[电子电信—物理电子学] TQ171.734[化学工程—玻璃工业]

 

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