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.
Published Version
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