Affiliation:
1. School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
Abstract
We investigated the effects of Co doping on Pr0.7Ca0.3MnO3−d in the perspective of an oxygen-bonding state change. In all compositions, Pr0.7Ca0.3Mn1−xCoxO3−d (PCMCx, x = 0, 0.1, 0.2, 0.3) showed an orthorhombic structure, and the lattice gradually contracted with increasing Co content. The doped Co was mostly present as 2+ and 3+, which decreased the average oxidation value of the B site and created oxygen vacancies for charge compensation. However, as the Co content increased, the proportion of Co3+ increased, and the content of oxygen vacancies gradually decreased. In addition, the ratio of adsorbed oxygen in PCMC0.1 was the highest, and the B-O covalency was enhanced. Accordingly, the electrochemical reaction of oxygen with the cathode material in PCMC0.1 could occur most easily, showing the smallest polarization resistance among the Co-doped Pr0.7Ca0.3MnO3−d. We can confirm the formation of oxygen vacancies via Co doping and the effect of B-O covalency on the oxygen-reduction reaction of Pr0.7Ca0.3MnO3−d.
Funder
Korea Institute for Advancement of Technology
Subject
Materials Science (miscellaneous),Ceramics and Composites
Reference26 articles.
1. Solid oxide fuel cell: Decade of progress, future perspectives and challenges;Singh;Int. J. Hydrogen Energy,2021
2. Thermal and electrochemical properties of PrBa0.5Sr0.5Co2−xFexO5+δ (x = 0.5, 1.0, 1.5) cathode materials for solid-oxide fuel cells;Jiang;J. Power Sources,2013
3. Electrochemical performance of PrBaCo2O5+δ layered perovskite as an intermediate-temperature solid oxide fuel cell cathode;Zhu;J. Power Sources,2008
4. An SOFC anode model using TPB-based kinetics;Tabish;Int. J. Hydrogen Energy,2020
5. Yang, G., Jung, W., Ahn, S.-J., and Lee, D. (2019). Controlling the Oxygen Electrocatalysis on Perovskite and Layered Oxide Thin Films for Solid Oxide Fuel Cell Cathodes. Appl. Sci., 9.