Abstract
Developing mixed ionic and electronic conduction materials with high electrochemical performance and strong structural stability is paramount importance to the success of SOFCs. In this work, Ba0.9Co0.7Fe0.2Nb0.1O3-δ-xCe0.85Sm0.15O1.925 (B0.9CFN-xSDC, x = 0–40 wt%) materials are synthesized and evaluated properties. The research results indicate that the materials possess a good high-temperature chemical compatibility and interface stability with the Ce0.85Sm0.15O1.925 electrolyte. The B0.9CFN-30SDC has sufficient porosity and suitable particle size. A continuous B0.9CFN conductive phase is formed inside the cathode, and a continuous ion diffusion pathway is also formed similarly. The B0.9CFN-30SDC cathode shows the lowest polarization resistance and the maximum power density. Oxygen partial pressure test results show the impedance spectrum of B0.9CFN-0SDC consists of three parts, but the B0.9CFN-30SDC cathode consists of two parts. The addition of SDC phase accelerates the charge transfer process and the dissociative adsorption and diffusion process, and further promotes oxygen reduction reaction processes.
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