Enhanced electrochemical performance of Ca-doped NdBa1-xCaxCoCuO5+δ as cathode material for intermediate-temperature solid oxide fuel cells. Issue 17 (1st December 2018)

• Record Type: Journal Article
• Authors: Pang, Shengli; Su, Yanjing; Yang, Gongmei; Shen, Xiangqian; Zhu, Meng; Wu, Xiao; Li, Songwei; Yang, Xiaofen; Xi, Xiaoming
• Is Part Of: Ceramics international. Volume 44:Issue 17(2018)
• Page Start: 21902
• Page End: 21907
• Publication Date: 2018-12-01
• Subjects: Solid oxide fuel cells -- Double perovskites -- Electrochemical performance -- Thermal expansion; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.08.301
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Exploring advanced cathode materials that have high electrochemical activity and superior thermal compatibility with other components is of great importance for the application of intermediate-temperature solid oxide fuel cells. In the present study, influences of Ca doping on electrochemical and physicochemical properties of NdBa1-x Cax CoCuO5+δ were studied systematically. A relatively low thermal expansion coefficient (16.8 × 10 −6 °C −1 ) was obtained for the Ca-doped sample over the temperature range of 25–800 °C. Moreover, Ca doping significantly enhanced the electrochemical performance of NdBa1-x Cax CoCuO5+δ . The highest densities of power for NdBa1-x Cax CoCuO5+δ -based single cells at the temperatures of 800 °C increased from 1.42 W cm −2 for x = 0.0 to 1.84 W cm −2 for x = 0.3. This increase in electrochemical performance of NdBa1-x Cax CoCuO5+δ cathode with Ca doping can be ascribed to enhanced concentrations of oxygen vacancies and higher electrical conductivity.