Perovskite Sr 0.9 Y 0.1 CoO 3-δ Nanorods Modified with CoO Nanoparticles as a Bifunctional Catalyst for Rechargeable Li-O 2 Batteries
Jie Wang (Chinese Academy of Sciences)
Xiaopeng Cheng (Beijing University of Technology)
Zhaolong Li (TU Delft - Applied Sciences)
Meng Xu (University of Science and Technology Beijing)
Yao Lu (Chinese Academy of Sciences)
Shengming Liu (University of Science and Technology Beijing, Chinese Academy of Sciences)
Yuefei Zhang (Beijing University of Technology)
Chunwen Sun (Guangxi University, Chinese Academy of Sciences)
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Abstract
For practical application of lithium-oxygen batteries, one of the challenges is the development of efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in cathode. In this work, perovskite Sr
0.9
Y
0.1
CoO
3-δ
nanorods are synthesized by an electrospinning method. The performance of the Li-O
2
cell with Sr
0.9
Y
0.1
CoO
3-δ
catalysts is better than that of the cell only with Super-P. Furthermore, modification of CoO nanoparticles on the cathode can provide an obviously improved electrochemical performance with a reduced voltage gap (∼80-140 mV), which is ascribed to the superior catalytic activity of CoO nanoparticles toward OER. All of these results demonstrate that the perovskite Sr
0.9
Y
0.1
CoO
3-δ
is an efficient bifunctional electrocatalyst for lithium-oxygen batteries, and the incorporation of CoO nanoparticles is an effective approach for improving the cathode performance as well.