Journal
JOURNAL OF POWER SOURCES
Volume 495, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.229776
Keywords
Cathode; Proton-conducting solid oxide fuel cell; Praseodymium doping; Barium ferrite; Oxygen surface exchange
Funding
- National Natural Science Foundation of China [22075205]
- Tianjin Municipal Science and Technology Commission [19JCYBJC21700]
- Program of Introducing Talents to the University Disciplines [B06006]
- Program for Changjiang Scholars and Innovative Research Teams in Universities [IRT 0641]
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Pr-doped BaCe0.2Fe0.8O3-8 shows improved oxygen surface exchange kinetics and activity as a cobalt-free cathode material, leading to lower polarization resistance in proton-conducting solid oxide fuel cells.
BaCe0.2Fe0.8-xPrxO3-8 (x = 0?0.3) is studied as a cobalt-free cathode material for proton-conducting solid oxide fuel cells. The cathode is composed of a cubic BaFeO3-8 phase and an orthorhombic BaCeO3-8 phase, and Pr is doped in both phases. The partial substitution of Pr for Fe decreases the content of the BaFeO3-8 phase, leading to a lower electrical conductivity. BaCe0.2Fe0.6Pr0.2O3-8 has the most adsorbed oxygen and Fe3+ on the surface, resulting in the fastest oxygen surface exchange kinetics and the highest activity. The partial pressure of H2O shows a negligible effect on the polarization resistance of the cathode. In contrast, the polarization resistance increases remarkably with the decrease of oxygen partial pressure, indicating that the rate of the cathode process is controlled by the surface exchange of oxygen. At 700 ?C, BaCe0.2Fe0.6Pr0.2O3-8 shows the lowest polarization resistance of 0.057 0 cm2, and a single cell with that cathode exhibits the highest maximum power density of 562 mW cm-2. The results demonstrate that Pr doped BaCe0.2Fe0.8O3-8 is a promising cobalt-free cathode material for proton-conducting solid oxide fuel cells.
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