| Performance and stability of electrolyte-supported solid oxide fuel cells: from button-sized to 5×5 cm2 |
Han Hwi Kim1, Adil Akhtar1, Min Joo Kim1, Junho Jo1, Tae Ho Shin3, Hyung-Tae Lim1,2
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1Department of Materials Convergence and System Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongnam, 641-773, Republic of Korea
2School of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongnam, 641-773, Republic of Korea
3Hydrogen Energy Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, 52851, Republic of Korea |
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Received: November 7, 2023; Revised: November 29, 2023 Accepted: December 6, 2023. Published online: December 18, 2023. |
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| ABSTRACT |
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We prepared button-sized and 5×5 cm2 electrolyte-supported solid oxide fuel cells. The button-sized cell with a 150-micron-thin electrolyte shows a peak power density of 0.58 Wcm-2, whereas that with a 280-micron-thick electrolyte shows a peak power density of 0.42 Wcm-2, at 800°C, indicating that the performance of electrolyte-supported cells (ESCs) is dominated by electrolyte thickness. The 5×5 cm2 cell was tested, and its peak power density was found to be comparable to that of a button-sized cell with the same electrolyte thickness. An electrode-segmented 5×5 cm2 ESC was prepared to investigate the in-plane performance variation of the ESCs. The electrochemical performances of the inlet and outlet regions were almost identical, in contrast to those of anode-supported cells. The uniformity of in-plane performance distribution, i.e., in-plane anode gas concentration distribution, improved considerably in ESCs when utilizing a thinner anode (~20 micron). A nonuniform gas concentration distribution can lead to anode degradation associated with Ni re-oxidation, and therefore, the electrolyte-support type is preferred for mitigating anode performance degradation. |
| Key words:
Solid oxide fuel cells · Electrolyte-supported cells · In-plane performance variation · Planar-type cells |
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