Synergistic Effect of A-Site Cation Ordered-Disordered Perovskite as a Cathode Material for Intermediate Temperature Solid Oxide Fuel Cells. Issue 7 (1st January 2017)

• Record Type: Journal Article
• Authors: Pang, Shengli; Wang, Wenzhi; Su, Yanjing; Shen, Xiangqian; Wang, Yonggang; Xu, Kaijie; Chen, Chonglin
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 7(2017)
• Page Start: F775
• Page End: F780
• Publication Date: 2017-01-01
• Subjects: Cathode -- Electrochemical performance -- Oxygen reduction -- Perovskites -- Solid oxide fuel cells -- Synergistic effect; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0701707jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The effects of Ca on the properties of PrBa1-x Cax Co2 O5+δ (x = 0.0, 0.3, and 0.5) as a cathode material for intermediate temperature solid oxide fuel cells were studied. Higher Ca content in PrBa1-x Cax Co2 O5+δ led to a gradual change in phase symmetry from A-site cation ordered double perovskite (x = 0.0) to mixed A-site cation ordered-disordered perovskite (x = 0.3) to A-site cation disordered simple perovskite (x = 0.5). It also led to a decreased oxygen content. Comparing the electrochemical performance of the samples with x = 0.0 and x = 0.5, PrBa0.7 Ca0.3 Co2 O5+δ exhibited the best catalytic activity for the oxygen reduction reaction and maximum power density. This was ascribed to the synergistic effect of the A-site cation ordered-disordered structure, which combined the advantages of a fast oxygen diffusion rate and a relatively short oxygen diffusion distance from the oxygen reduction site to the cathode/electrolyte interface. The maximum power density, which was as high as 2.16 W cm −2, was achieved for the PrBa0.7 Ca0.3 Co2 O5+δ -based single cell with a commercial anode-supported half cell at 800°C. PrBa0.7 Ca0.3 Co2 O5+δ was shown to be a potential cathode material for IT-SOFCs.