The effect of calcium on the properties of SmBa_1−xCa_xCoCuO_5+δ as a cathode material for intermediate-temperature solid oxide fuel cells

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• 作者：Wenzhi Wang^a ; Shengli Pang^a ; ^{slpang@ujs.edu.cn} ; ^{bingkuai163@163.com} ; Yanjing Su^a ; Xiangqian Shen^a ; ^{shenxq@mail.ujs.edu.cn} ; Yonggang Wang^a ; Kaijie Xu^a ; Xiaoming Xi^b ; Jun Xiang^c
• 关键词：Solid oxide fuel cells ; Cathode ; Perovskites ; Electrochemical performance
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：37
• 期：4
• 页码：1557-1562
• 全文大小：2424 K
• 卷排序：37

文摘

The effect of calcium on the properties of SmBa1–xCaxCoCuO5+δ (x = 0.0–0.3) as a cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs) is evaluated systematically. Samples exhibit a highly crystalline double perovskite phase, and their cell volumes decrease as x is changed from 0.0 to 0.3. The oxygen content and average thermal expansion coefficient (TEC) of SmBa1–xCaxCoCuO5+δ decreases as the calcium content increased. An average TEC of as low as 15.3 × 10−6 °C−1 is obtained for SmBa0.7Ca0.3CoCuO5+δ. The area specific resistances at 700 °C decrease by approximately 50% when the calcium content is increased from x = 0.0 (0.173 Ω cm2) to x = 0.3 (0.086 Ω cm2). The maximum power densities of SmBa1−xCaxCoCuO5+δ-based single cells at 800 °C increase from 635 mW cm−2 (x = 0.0) to 939 mW cm−2 (x = 0.3).