Effects of co-doped barium cerate additive on morphology,conductivity and electrochemical properties of samarium doped ceria electrolyte for intermediate temperature solid oxide fuel cells |
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Authors: | Meng Xia Lichao Jia Jin Li Yongpeng Liu Xin Wang Bo Chi Jian Pu Li Jian |
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Affiliation: | 1. Center for Fuel Cell Innovation, State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China;2. Laboratory for Molecular Engineering of Optoelectronic Nanomaterials (LIMNO), École Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015, Lausanne, Switzerland |
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Abstract: | The composite of samarium doped ceria (Sm0.2Ce0.8O2-δ, SDC) and co-doped barium cerate (BaZr0.1Ce0.7Y0.1Yb0.1O3-δ, BZCYYb) is prepared by mechanical mixing and investigated as electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs). Coexistence of SDC and BZCYYb are observed for composite electrolyte by X-ray diffraction after sintering at 1500 °C for 5 h, while the slight deviation of the diffraction peak indicating the element diffusion between two phases. The scanning electron microscope and electron probe microanalyzer results demonstrate that small BZCYYb grains disperse uniformly around the grains of SDC, limiting the growth of SDC grains and decreasing the average grain size of composite electrolyte. Impedance spectroscopy measurement reveals that the grain boundary resistance can be significantly reduced by about an order of magnitude through adding 15–30 wt. % BZCYYb to SDC. Single cells based on the composite electrolyte are fabricated using nickel cermet (Ni-SDC) anode and perovskite (La0.6Sr0.4Co0.2Fe0.8O3-δ, LSCF) cathode.Relatively high open circuit voltage (OCV), much lower polarization resistance and encouraging high power density are obtained for cells with composite electrolyte compared to those with single SDC electrolyte. Among all of the samples, single cell based on 15 wt. % BZCYYb-85 wt. % SDC composite electrolyte exhibits the lowest total resistances of 0.641 Ω·cm2 and the highest peak power densities of 0.56 W·cm?2 at 600 °C. |
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Keywords: | Solid oxide fuel cell Samarium doped ceria Co-doped barium cerate Composite electrolyte Conductivity Open circuit voltage |
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