Zhu Lin, Li Pengzhang, Li Yuanyuan, Fu Xiaonan, Qi Yuanyuan, Wang Juntao, Liu Zaixu, Yang Hongyan
School of Sciences, Henan University of Technology, Zhengzhou 450001, China.
Institute of New Energy Materials and Devices, School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China.
Molecules. 2024 Feb 29;29(5):1063. doi: 10.3390/molecules29051063.
The electrochemical activity and stability of the PBCO electrode are investigated under the annealing processes in an atmosphere containing CO/HO for solid oxide fuel cells (SOFCs). The electrochemical impedance spectrum results unequivocally confirm the significant deterioration in PBCO cathode performance upon annealing under ambient air conditions, particularly when exposed to CO/HO atmospheres. Microstructure and surface chemical state analyses reveal the segregation of BaO on the PBCO surface, and the formation of insulating BaCO degraded the electrochemical performance. CO and HO exhibit a significant induced effect on the segregation of Ba in PBCO to the surfaces, thereby causing a rapid decline in electrode performance. Additionally, the analysis of volume relaxation reveals that the presence of oxygen in the electrode environment can also influence the deposition process occurring on the surface of the electrode. However, this phenomenon is not observed in N. This study emphasizes the impact of various gases present in the working atmosphere on surface-separated BaO, which consequently plays a pivotal role in the activity and long-term stability of PBCO electrodes.
在用于固体氧化物燃料电池（SOFC）的含CO/H₂O气氛的退火过程中，研究了PBCO电极的电化学活性和稳定性。电化学阻抗谱结果明确证实，在环境空气条件下退火时，特别是暴露于CO/H₂O气氛中时，PBCO阴极性能会显著恶化。微观结构和表面化学状态分析表明，BaO在PBCO表面偏析，绝缘性BaCO₃的形成使电化学性能下降。CO和H₂O对PBCO中Ba向表面的偏析具有显著的诱导作用，从而导致电极性能迅速下降。此外，体积弛豫分析表明，电极环境中的氧的存在也会影响电极表面发生的沉积过程。然而，在N₂中未观察到这种现象。本研究强调了工作气氛中存在的各种气体对表面偏析的BaO的影响，这在PBCO电极的活性和长期稳定性中起着关键作用。
