Oxygen transport,thermal and electrochemical properties of NdBa0.5Sr0.5Co2O5+δ cathode for SOFCs |
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Authors: | Adi Subardi Kun-Yu Liao Yen-Pei Fu |
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Affiliation: | 1. Department of Materials Science & Engineering, National Dong Hwa University, Shou-Feng, Hualien, 97401, Taiwan;2. Department of Mechanical Engineering, STTNAS, Yogyakarta, 55281, Indonesia |
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Abstract: | In this study, the crystal structure, thermal, oxygen transport, electrical conductivity and electrochemical properties of the perovskite NdBa0.5Sr0.5Co2O5+δ (NBSC55) are investigated. In the temperature range of 250 °C–350 °C, the weight loss upon heating was due to a partial loss of lattice oxygen and along with a reduction of Co4+ to Co3+. The tend of weight-loss slows down as temperature increased above 350 °C indicating a reduction of Co3+ to Co2+ during this stage. The oxygen migration is dominated by surface exchange process at high temperature range (650-800 °C); however, the bulk diffusion process prevails at low temperature range (500–600 °C). For long-term testing, the polarization resistance of NBSC55 increases gradually form 3.13 Ω cm2 for 2 h to 3.34 Ω cm2 for 96 h at 600 °C and an increasing-rate for polarization resistance is around 0.22% h?1. The power density of the single cell with NBSC55 cathode reached 341 mW cm?2 at 800 °C. |
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Keywords: | Corresponding author Solid oxide fuel cells Oxygen migration mechanism Oxygen permeation flux Thermal properties Long-term testing |
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