The composite electrolyte with an insulation Sm2O3 and semiconductor NiO for advanced fuel cells |
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| Authors: | Liang Liu Yanyan Liu Lingyao Li Yan Wu Manish Singh Bin Zhu |
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| Affiliation: | 1. Engineering Research Center of Nano-Geo Materials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China;2. Department of Energy Technology, KTH Royal Institute of Technology, Stockholm, SE-10044, Sweden;3. Pure and Applied Biochemistry, Chemical Centre, Lund University, Lund, 22241, Sweden |
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| Abstract: | Novel Sm2O3?NiO composite was prepared as the functional electrolyte for the first time. The total electrical conductivity of Sm2O3?NiO is 0.38 S cm?1 in H2/air condition at 550 °C. High performance, e.g. 718 mW cm?2, was achieved using Sm2O3?NiO composite as an electrolyte of solid oxide fuel cells operated at 550 °C. The electrical properties and electrochemical performance are strongly depended on Sm2O3 and NiO constituent phase of the compositions. Notably, surprisingly high ionic conductivity and fuel cell performance are achieved using the composite system constituting with insulating Sm2O3 and intrinsic p-type conductive NiO with a low conductivity of 4 × 10?3 S cm?1. The interfacial ionic conduction between two phases is a dominating factor giving rise to significantly enhanced proton conduction. Fuel cell performance and further ionic conduction mechanisms are under investigation. |
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| Keywords: | Composite electrolyte Proton conduction Interfacial ionic conduction Semiconductor-ionic fuel cells |
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