Preparation and properties of ceramic interconnecting materials,La0.7Ca0.3CrO3?δ doped with GDC for IT-SOFCs |
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| Affiliation: | 1. Electrochemical Reaction and Technology Laboratory (ERTL), School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, South Korea;2. Ertl Center for Electrochemistry and Catalysis, Research Institute for Solar and Sustainable Energies, GIST, Gwangju 500-712, South Korea;1. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, No.1219 Zhongguan West Road, Ningbo, Zhejiang Province, 315200, PR China;2. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences;3. Jiangxi University of Science and Technology, Ganzhou, Jiangxi Province, 341000, PR China;1. Fuel Cell Research Center, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea;2. Department of Advanced Energy and Technology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea;1. School of Material Science and Engineering, Shiraz University, Iran;2. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore;1. Department of Materials Science and Engineering, University of Sheffield, Sheffield, S13JD, UK;2. Department of Mechanical Engineering, University of Colorado Boulder, CO, 80309, US;3. Materials Science Engineering Program, University of Colorado Boulder, CO, 80309, US;1. Division of Advanced Materials Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea;2. Department of Physics and Nanotechnology, SRM University, Kattankulathur 603203, India;3. Hydrogen and Fuel Cell Research Center, Chonbuk National University, Jeonbuk 561-756, Republic of Korea |
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| Abstract: | One of the challenges for improving the performance and cost-effectiveness of solid oxide fuel cells (SOFCs) is the development of effective interconnect materials. A widely used interconnect ceramic for SOFCs is doped lanthanum chromite. In this paper, we report a doped lanthanum chromite, La0.7Ca0.3CrO3?δ (LCC) + x wt.% Gd0.2Ce0.8O1.9 (GDC) (x = 0–10), with improved electrical conductivity and sintering capability. In this composite material system, LCC + GDC were prepared by an auto-ignition process and the electrical conductivity was characterized in air and in H2. The LCC powders exhibited a better sintering ability and could reach a 94.7% relative density at 1400 °C for 4 h in air and with the increase of GDC content the relative density increased, reached 98.5% when the GDC content was up to 10 wt.%. The electrical conductivity of the samples dramatically increased with GDC addition until a maximum of 134.48 S cm?1 in air at 900 °C when the materials contained 3 wt.% GDC. This is 5.5 times higher than pure LCC (24.63 S cm?1). For the sample with a 1 wt.% GDC content, the conductivity in pure H2 at 900 °C was a maximum 5.45 S cm?1, which is also higher than that of pure LCC ceramics (4.72 S cm?1). The average thermal expansion coefficient (TEC) increased with the increase of GDC content, ranging from 11.12 to 14.32 × 10?6 K?1, the majority of which unfortunately did not match that of 8YSZ. The oxygen permeation measurement presented a negligible oxygen ionic conduction, indicating that it is still an electronically conducting ceramic. Therefore, it is a very promising interconnect material for higher performance and cost-effectiveness for SOFCs. |
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