New strategy for boosting cathodic performance of low temperature solid oxide fuel cells via chlorine doping
ShaoHua Xu, Hao Qiu, Shanshan Jiang, Jingjing Jiang, Wei Wang, Xiaomin Xu, Wei Kong, Tanaka Dennis Chivurugwi, Arkadіі Proskurin, Daifen Chen, Chao Su
Abstract
To enhance the performance and widespread use of solid oxide fuel cells (SOFCs), addressing the low-temperature (< 650 °C) electrochemical performance and operational stability issues of cathode materials is crucial. Here, we propose an innovative approach to enhance oxygen ion mobility and electrochemical performance of perovskite oxide by substituting some oxygen sites with chlorine anions. The designed SrTa 0.1 Fe 0.9 O 3-δ- x Cl x ( x = 0.05 and 0.10) exhibits improved performance compared to SrTa 0.1 Fe 0.9 O 3-δ (STF). SrTa 0.1 Fe 0.9 O 2.95-δ Cl 0.05 (STFCl0.05) shows the lowest area-specific resistance (ASR) value on Sm 0.2 Ce 0.8 O 1.9 (SDC) electrolyte. At 600 °C, STFCl0.05 achieves an ASR value of 0.084 Ω·cm 2 , and a single cell with STFCl0.05 reaches a higher peak power density (PPD) value (1143 mW·cm -2 ) than that with STF (672 mW·cm -2 ). Additionally, besides exhibiting excellent oxygen reduction reaction (ORR) activity at lower temperatures, the STFCl0.05 cathode demonstrates good CO 2 tolerance and operational stability. Symmetrical cell operation lasts for 150 h, and single cell operation endures for 720 h without significant performance decline. The chlorine doping approach effectively enhances ORR activity and stability, making STFCl0.05 a promising cathode material for low-temperature SOFCs.