Robust and reliable solid oxide fuel cells with modified thin film YSZ electrolyte |
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Authors: | Liya Cheng Qiuqiu Lyu Zongxun Li Yang Liu Chao Jin Na Xu Qin Zhong Tenglong Zhu |
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Affiliation: | 1. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, China;2. Xuzhou Huatsing Jingkun Energy Co., Ltd., Xuzhou, China;3. College of Energy, Soochow University, Suzhou, China;4. Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, Changchun, China |
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Abstract: | Reduce electrolyte thickness can improve solid oxide fuel cell (SOFC) performance. However, thinner electrolyte often contains prominent defects and flaws, which may decrease the yield and increase operation risk. This work proposes a method to modify the thin film YSZ electrolyte, to improve cell reliability and durability. The as-sintered anode supported half-cell with screen printed YSZ electrolyte was immersed in precursor solution of Y(NO3)3·6H2O and Zr(NO3)4·5H2O, and being treated under hydrothermal condition of 150°C for 12 h. As a result, the modified cells show slight increase in the OCV values. Furthermore, the hydrothermal modification effectively promotes interface sintering between YSZ electrolyte and GDC barrier layer, yielding a smaller ohmic resistance of .142 Ω·cm2 (a decrease of ∼11%) and a higher peak power density of .964 W/cm2 (an increase of ∼18%) at 750°C, than pristine cell. Moreover, the modified cell operates stably over 300 h, while the pristine cell presents large and irregular voltage fluctuations. This work suggests that the hydrothermal modification is an effective and promisingly industrial applicable method for thin film electrolyte recovery in SOFCs. |
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Keywords: | hydrothermal modification solid oxide fuel cell thin film electrolyte |
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