Electrochemical performance of intermediate temperature micro-tubular solid oxide fuel cells using porous ceria barrier layers |
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| Affiliation: | 1. Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, c/Pedro Cerbuna no. 12, 50009 Zaragoza, Spain;2. Centro Universitario de la Defensa, General Military Academy, Ctra. Huesca s/n, 50090 Zaragoza, Spain;1. Department of Materials Science and Engineering, National Cheng Kung University, Tainan City 70101, Taiwan;2. Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan City 70101, Taiwan;3. Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan City 70101, Taiwan;1. College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China;2. Institute of Marine Materials Science and Engineering, College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China;1. V. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, 41 Nauki avenue, 03028 Kyiv, Ukraine;2. L. V. Pisarzhevsky Institute of the Physical Chemistry NAS of Ukraine, 31 Nauki avenue, 03028 Kyiv, Ukraine;1. Ionics Lab, School of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwang-Ju 500-757, Republic of Korea;2. Green Growth Technology Laboratory, Korea Electric Power Research Institute, 65 Munji-Ro, Yuseong-Gu, Daejeon 305-760, Republic of Korea;3. Department of Materials Science and Engineering, Hongik University, 72-1 Sangsu-dong Mapo-gu, Seoul 121-791, Republic of Korea;1. Centre DIOPMA, Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain;2. Instituto de Cerámica y Vidrio (CSIC) Kelsen 5, Cantoblanco, 28049 Madrid, Spain |
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| Abstract: | We describe the manufacture and electrochemical characterization of micro-tubular anode supported solid oxide fuel cells (mT-SOFC) operating at intermediate temperatures (IT) using porous gadolinium-doped ceria (GDC: Ce0.9Gd0.1O2?δ) barrier layers. Rheological studies were performed to determine the deposition conditions by dip coating of the GDC and cathode layers. Two cell configurations (anode/electrolyte/barrier layer/cathode): single-layer cathode (Ni–YSZ/YSZ/GDC/LSCF) and double-layer cathode (Ni–YSZ/YSZ/GDC/LSCF–GDC/LSCF) were fabricated (YSZ: Zr0.92Y0.16O2.08; LSCF: La0.6Sr0.4Co0.2Fe0.8O3?δ). Effect of sintering conditions and microstructure features for the GDC layer and cathode layer in cell performance was studied. Current density–voltage (j–V) curves and impedance spectroscopy measurements were performed between 650–800 °C, using wet H2 as fuel and air as oxidant. The double-cathode cells using a GDC layer sintered at 1400 °C with porosity about 50% and pores and grain sizes about 1 μm, showed the best electrochemical response, achieving maximum power densities of up to 160 mW cm?2 at 650 °C and about 700 mW cm?2 at 800 °C. In this case GDC electrical bridges between cathode and electrolyte are preserved free of insulating phases. A preliminary test under operation at 800 °C shows no degradation at least during the first 100 h. These results demonstrated that these cells could compete with standard IT-SOFC, and the presented fabrication method is applicable for industrial-scale. |
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| Keywords: | A Dip coating C Electrochemical properties D GDC E Micro-tubular SOFC |
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