Redox-induced performance degradation of anode-supported tubular solid oxide fuel cells |
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Authors: | Yeon-Hyuk Heo Jong-Won LeeSeung-Bok Lee Tak-Hyoung LimSeok-Joo Park Rak-Hyun Song Chong-Ook ParkDong-Ryul Shin |
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Affiliation: | a Fuel Cell Research Center, Korea Institute of Energy Research, 102 Gajeong-ro, Yuseong-gu, Daejeon, 305-343, Republic of Korea b Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahak-ro, Yuseong-gu, Daejeon, 305-701, Republic of Korea |
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Abstract: | Redox behavior of a Ni-Y2O3-stabilized ZrO2 (YSZ) composite anode support and the performance degradation of an anode-supported tubular solid oxide fuel cell (SOFC) were studied under complete oxidation and reduction conditions (degrees of oxidation and reduction = 100%). Materials characterization studies showed that the exposure time in oxidizing and reducing atmospheres played a critical role in the degradation of the porous structures and the physical properties of the anode support. In particular, the redox cycling with an 8 h exposure time resulted in the cracking of YSZ network, leading to significant decay of the mechanical strength. The polarization experiments on the redox-cycled anode-supported tubular cell showed serious performance degradation as a result of the decreases of open-circuit potential and power density. The ac-impedance measurements combined with microstructural observations indicated that the performance degradation resulted mainly from (i) the degradation of anode support, (ii) microcracks across the whole cell, and (iii) interface delamination. |
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Keywords: | Solid oxide fuel cell Anode-supported tubular cell Ni-YSZ composite Redox cycling Durability |
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