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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 Y 3+ adversely affects the high-temperature membrane sintering of the benchmark protonic electrolyte BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3−δ , reducing its conductivity and stability. By introducing a molten salt approach, pre-doping of Y 3+ 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.
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Ze Liu
Yufei Song
Xiaolu Xiong
Nature Communications
Chinese Academy of Sciences
University of Chinese Academy of Sciences
Hong Kong University of Science and Technology
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Liu et al. (Sat,) studied this question.
www.synapsesocial.com/papers/6a11e5bac031bb6829a58552 — DOI: https://doi.org/10.1038/s41467-023-43725-x