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Citation: ZHU Cheng-Fei, WANG Gang, XUE Jin-Hua, WANG Xiao-Jun. Structure and Properties of Sm_0.5Sr_0.5Co_0.4M_0.6O₃(M=Co,Mn, Fe) as IT-SOFCs Cathodes[J]. Acta Physico-Chimica Sinica, ;2009, 25(06): 1179-1184. doi: 10.3866/PKU.WHXB20090609 shu

Structure and Properties of Sm_0.5Sr_0.5Co_0.4M_0.6O₃(M=Co,Mn, Fe) as IT-SOFCs Cathodes

1.
College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, P. R. China

Received Date: 10 December 2008
Available Online: 31 March 2009

The structure and performance of Sm0.5Sr0.5Co0.4M0.6O3(M=Co, Mn, Fe|denoted SSCC, SSCM and SSCF, respectively) as intermediate temperature-solid oxide fuel cells (IT-SOFCs) cathodes were investigated by X-ray diffraction (XRD), thermogravimetry (TG), thermal expansion, electrical conductivity and electrochemical impedance spectroscopy (EIS). The Sm0.5Sr0.5Co0.4M0.6O3 system has an orthorhombic structure. The crystal parameter increases in the following order: Co, Mn, Fe, while the oxygen content, thermal expansion and electrical conductivity decrease in the same order. The electrocatalytic activity of SSCMcathodes is limited by the oxide ion diffusion process because of low oxide ion vacancy, while the electrocatalytic activity of SSCC or SSCF is controlled by an oxygen exchange process on the cathode surface and an oxide ion diffusion process in the cathode because of the high oxide ion vacancy. The area specific resistance (ASR) of SSCF is lower than that of the SSCC above 700 ℃ because of the high oxide diffusion coefficient of SSCF, so the total electrocatalytic activity of SSCF is higher than that of SSCC.
- IT-SOFCs,
- Cathode,
- Sm0.5Sr0.5Co0.4M0.6O3,
- Structure and property
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沈阳化工大学材料科学与工程学院沈阳 110142

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Structure and Properties of Sm0.5Sr0.5Co0.4M0.6O3(M=Co,Mn, Fe) as IT-SOFCs Cathodes

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通讯作者: 陈斌, bchen63@163.com

Structure and Properties of Sm_0.5Sr_0.5Co_0.4M_0.6O₃(M=Co,Mn, Fe) as IT-SOFCs Cathodes