Sintering-induced cation displacement in protonic ceramics and way for its suppression

Ze Liu, Yufei Song, Xiaolu Xiong, Yuxuan Zhang, Jingzeng Cui, Jianqiu Zhu, Lili Li, Jing Zhou, Chuan Zhou, Zhiwei Hu, Guntae Kim, Francesco Ciucci, Zongping Shao (), Jian-Qiang Wang () and Linjuan Zhang ()
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Ze Liu: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Yufei Song: The Hong Kong University of Science and Technology
Xiaolu Xiong: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Yuxuan Zhang: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Jingzeng Cui: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Jianqiu Zhu: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Lili Li: Shandong University
Jing Zhou: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Chuan Zhou: College of Chemical Engineering, Nanjing Tech University
Zhiwei Hu: Max Planck Institute for Chemical Physics of Solids
Guntae Kim: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Francesco Ciucci: University of Bayreuth
Zongping Shao: Curtin University
Jian-Qiang Wang: Shanghai Institute of Applied Physics, Chinese Academy of Sciences
Linjuan Zhang: Shanghai Institute of Applied Physics, Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-43725-x

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