A cobalt-free Pr6O11–BaCe0.2Fe0.8O3-δ composite cathode for protonic ceramic fuel cells with promising oxygen reduction activity and hydration ability
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Journal of Power Sources, Volume 599
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Oxygen reduction and proton conduction originated from hydration are two key steps in the cathode process of protonic ceramic fuel cells. In this work, Pr6O11 is impregnated into a cobalt-free BaCe0.2Fe0.8O3-δ cathode, resulting in an improved activity of lattice oxygen and a moderate enhancement of the electrical conductivity, both of which are beneficial for charge transfer, the rate-determining step of oxygen reduction process at the cathode. The polarization resistance of bare BaCe0.2Fe0.8O3-δ cathode for oxygen reduction is 0.115 Ω cm2 at 700 °C, which is reduced significantly to 0.039 Ω cm2 with the addition of 30 wt% Pr6O11. Besides, the hydration ability of the cathode is also improved with Pr6O11, and thus the combination of proton and oxygen is facilitated. A single cell with 30 wt% Pr6O11-70 wt% BaCe0.2Fe0.8O3-δ composite cathode exhibits the highest maximum power density of 1406 mW cm−2 at 700 °C. The composite cathode also shows a good stability.Description
Publisher Copyright: © 2024 Elsevier B.V.
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Lu, X, Yang, Z, Zhang, J, Zhao, X, Chen, J, Liu, W, Zhao, Y & Li, Y 2024, 'A cobalt-free Pr 6 O 11 –BaCe 0.2 Fe 0.8 O 3-δ composite cathode for protonic ceramic fuel cells with promising oxygen reduction activity and hydration ability', Journal of Power Sources, vol. 599, 234233. https://doi.org/10.1016/j.jpowsour.2024.234233