Cobalt-Free Perovskite Oxide La0.6Sr0.4Fe0.8Ni0.2O3-delta as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells
Cobalt-Free Perovskite Oxide La0.6Sr0.4Fe0.8Ni0.2O3-delta as Active and Robust Oxygen Electrode for Reversible Solid Oxide Cells
复制标题
无钴钙钛矿氧化物 La0.6Sr0.4Fe0.8Ni0.2O3-delta 作为可逆固体氧化物电池的活性且坚固的氧电极
DOI：
10.1021/acsaem.9b00115
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发表时间：
2019
影响因子：
6.4
通讯作者：
Li Jian
中科院分区：
文献类型：
--
作者：
Tian Yunfeng;Wang Wenjie;Liu Yun;Zhang Lingling;Jia Lichao;Yang Jun;Chi Bo;Pu Jian;Li Jian
可逆固体氧化物电池因其高效率而受到越来越多的关注。无钴钙钛矿电极具有与电解质相匹配的热膨胀系数和抑制sr偏析的可逆操作。本文研制了一种新型无钴钙钛矿La0.6Sr0.4Fe0.8Ni0.2O3−δ钙钛矿作为可逆固体氧化物电池的氧电极。详细研究了La0.6Sr0.4Fe0.8Ni0.2O3−δ氧电极在燃料电池模式和电解模式下的电化学性能。在燃料电池模式下，在800℃时可实现961 mW cm - 2的最大功率密度和0.142 Ω cm - 2的极化电阻。当电池在电解模式下工作时，电流密度范围为0.53 A cm - 2（750℃）至1.09 A cm - 2（850℃），绝对湿度为50 vol % (1.3 V)，绝对湿度为90 vol %（800℃），产氢率可达1348.5 mL (cm2h)−1。在中期可逆运行144 h期间，固态氧化物电池表现出良好的可逆性和稳定性。结果表明，La0.6Sr0.4Fe0.8Ni0.2O3−δ作为可逆固体氧化物电池的氧电极材料具有广阔的应用前景。
Reversible solid oxide cells have received increasing attention due to high efficiency. Cobalt-free perovskite electrode has compatible thermal expansion coefficient matching with the electrolyte and the reversible operation to inhibit the segregation of Sr. Herein a novel cobalt-free La0.6Sr0.4Fe0.8Ni0.2O3−δperovskite is developed and investigated as oxygen electrode for reversible solid oxide cells. The electrochemical performance of La0.6Sr0.4Fe0.8Ni0.2O3−δoxygen electrode in fuel cell mode and electrolysis mode is investigated in detail. The maximum power density of 961 mW cm–2and polarization resistance of 0.142 Ω cm2at 800 °C can be achieved in fuel cell mode. While the cell is operated in electrolysis mode, the current density ranges from 0.53 A cm–2at 750 °C to 1.09 A cm–2at 850 °C with 50 vol % absolute humidity at 1.3 V, and the hydrogen generation rate can reach up to 1348.5 mL (cm2h)−1with 90 vol % absolute humidity at 800 °C. The reversible solid oxide cells show excellent reversibility and stability during 144 h medium-term reversible operation. The results indicate that La0.6Sr0.4Fe0.8Ni0.2O3−δhas a bright prospect as the oxygen electrode material for reversible solid oxide cells.