Affiliation:
1. School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China
Abstract
Mixed oxygen ion and electron-conducting materials are viable cathodes for solid oxide fuel cells due to their excellent oxygen transport kinetics and mixed electrical conductivity, which ensure highly efficient operation at low and medium temperatures. However, iron-based double perovskite oxides usually exhibit poor electrocatalytic activity due to low electron and oxygen ion conductivity. In this paper, Ca is doped in PrBaFe2O5+δ A-site to improve the electrochemical performance of PrBaFe2O5+δ. Results show that replacing Pr with Ca does not change the crystal structure, and the Ca doping effectively increases the adsorbed oxygen content and accelerates the migration and diffusion rate of O2− to the electrolyte|cathode interface. The polarization resistance of the symmetric cell PC0.15BF|CGO|PC0.15BF is 0.033 Ω·cm2 at 800 °C, which is about 56% lower than that of PBF, confirming the enhancement of the mixed conduction of oxygen ions and electrons. In addition, the anode-supported single cell has a peak power density of 512 mW·cm−2 at 800 °C.
Funder
National Natural Science Foundation of China
Scientific research program of Inner Mongolia higher education institutions
Inner Mongolia Autonomous Region Universities basic scientific research project
Baotou Science and Technology Bureau project
Integrated Research Platform of Novel and Important Energy Comprehensive Utilization Technology in Inner Mongolia Autonomous Region