Exsolution of Cu nanoparticles in (LaSr)0.9Fe0.9Cu0.1O4 Ruddlesden-Popper oxide as symmetrical electrode for solid oxide cells
Exsolution of Cu nanoparticles in (LaSr)0.9Fe0.9Cu0.1O4 Ruddlesden-Popper oxide as symmetrical electrode for solid oxide cells
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Cu 纳米粒子在 (LaSr)0.9Fe0.9Cu0.1O4 Ruddlesden-Popper 氧化物中的溶出作为固体氧化物电池的对称电极
DOI：
10.1016/j.apsusc.2020.145525
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发表时间：
2020-05-01
影响因子：
6.7
通讯作者：
Wu, Kai
中科院分区：
文献类型：
--
作者：
Fu, Lei;Zhou, Jun;Wu, Kai
在这项工作中，我们报告了一个高活性的Ruddlesden-Popper氧化物作为对称电极的固体氧化物电池通过原位出溶策略。Cu纳米颗粒修饰的（LaSr）（0.9）Fe0.9Cu0.1O4（LSFCu）氧化物可以通过简单的还原过程制备。采用密度泛函理论（DFT）方法研究了Cu纳米粒子的出溶机理.计算结果表明，盐岩层中氧释放的能量更大，导致出溶动力学加速。（100）面由于表面能最低，是发生出溶的优先面。LSFCu同时作为燃料电极和氧电极，对氧还原反应（ORR）和燃料氧化反应（FOR）具有很高的电催化活性。在燃料电池（FC）模式下，使用加湿的H-2和CH 4作为燃料，在800 ℃下的峰值功率密度分别为573 mW cm（-2）和396 mW cm（-2）。此外，在电解池（EC）模式中，在1.2V的电压下也可以实现1.02A cm（-2）的非常高的电流密度，这意味着这种由Cu纳米颗粒修饰的Ruddlesden-Popper氧化物作为对称固体氧化物电池中的蒸汽电解的催化剂是高度活性的。
In this work, we report a highly active Ruddlesden-Popper oxide as a symmetrical electrode for solid oxide cells through in-situ exsolution strategy. The Cu nanoparticles-decorated (LaSr)(0.9)Fe0.9Cu0.1O4 (LSFCu) oxide can be simply fabricated by a reducing procedure. The exsolved mechanism of Cu nanoparticle is investigated by the density functional theory (DFT) method. The calculation demonstrates that oxygen releasing is present more energetic in the rocksalt layers, causing the accelerated kinetics of exsolution. The (1 0 0) surface could be the preferential surface for exsolution where take place because of the lowest surface energy. The LSFCu shows a highly electrocatalytic activity as fuel electrode and oxygen electrode simultaneously toward oxygen reduction reaction (ORR) and fuel oxidation reaction (FOR) respectively. In fuel cell (FC) mode, the peak power densities are 573 mW cm(-2) and 396 mW cm(-2) at 800 degrees C using humidified H-2 and CH4 as fuels, respectively. Moreover, a very high current density of 1.02 A cm(-2) can also be accomplished at a voltage of 1.2 V in electrolysis cell (EC) mode, implying that this Ruddlesden-Popper oxide decorated by Cu nanoparticles is highly active as the catalyst for the steam electrolysis in symmetrical solid oxide cells.