Optimizing Anode Performance of (La,Sr)1-αTi1-βNiβO3-δ in Solid Oxide Fuel Cells via Synergistic A-site Deficiency and B-site Doping Regulation Strategy

Abstract

This study introduces an innovative approach to enhance the electrochemical performance of La-substituted SrTiO₃ anode materials in solid oxide fuel cells (SOFCs) through the strategic combination of A-site deficiency and B-site doping. The effective method leverages the synergistic effects of A-site deficiency and B-site doping on Ni in situ exsolution and the electrochemical behavior of the SOFCs. The tailored (La,Sr)_1-αTi_1-βNi_βO_3-δ (α=0.2, β=0.15, (LS)_0.8TN_0.15) anode, modified with Ni nanoparticles, significantly boosts the power output of YSZ-supported single cells, achieving peak power densities of 720.5, 535.8, and 376.3 mW cm^-2 at 800, 700, and 600°C, respectively, under a humidified hydrogen atmosphere (3% H₂O-97% H₂). The findings underscore the pivotal role of optimized A-site deficiency and B-site doping in fine-tuning the morphology and dispersion of Ni nanoparticles, thereby markedly enhancing the catalytic activity and the overall electrochemical efficiency of the electrodes. These results indicate the promising candidacy of (La,Sr)_1-αTi_1-βNi_βO_3-δ as an anode material for SOFCs, opening new avenues for the design of high-performance fuel cell components.