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- Title
Sintering-induced cation displacement in protonic ceramics and way for its suppression.
- Authors
Liu, Ze; Song, Yufei; Xiong, Xiaolu; Zhang, Yuxuan; Cui, Jingzeng; Zhu, Jianqiu; Li, Lili; Zhou, Jing; Zhou, Chuan; Hu, Zhiwei; Kim, Guntae; Ciucci, Francesco; Shao, Zongping; Wang, Jian-Qiang; Zhang, Linjuan
- Abstract
Protonic ceramic fuel cells with high efficiency and low emissions exhibit high potential as next-generation sustainable energy systems. However, the practical proton conductivity of protonic ceramic electrolytes is still not satisfied due to poor membrane sintering. Here, we show that the dynamic displacement of Y3+ adversely affects the high-temperature membrane sintering of the benchmark protonic electrolyte BaZr0.1Ce0.7Y0.1Yb0.1O3−δ, reducing its conductivity and stability. By introducing a molten salt approach, pre-doping of Y3+ into A-site is realized at reduced synthesis temperature, thus suppressing its further displacement during high-temperature sintering, consequently enhancing the membrane densification and improving the conductivity and stability. The anode-supported single cell exhibits a power density of 663 mW cm−2 at 600 °C and long-term stability for over 2000 h with negligible performance degradation. This study sheds light on protonic membrane sintering while offering an alternative strategy for protonic ceramic fuel cells development.The conductivity of protonic ceramic electrolytes for fuel cells is unsatisfactory due to poor sintering. Here, the authors report the adverse effects of dynamic Y3+ displacement on high-temperature membrane sintering and propose a new strategy for pre-doping Y into A-site to inhibit its further displacement.
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-43725-x