Hierarchical mesoporous perovskite La <sub>0</sub> <sub>.5</sub> Sr <sub>0.5</sub> CoO <sub>2.91</sub> nanowires with ultrahigh capacity for Li-air batteries

Yunlong Zhao(Wuhan University of Technology), Lin Xu(Wuhan University of Technology), Liqiang Mai(Wuhan University of Technology), Chunhua Han(Wuhan University of Technology), Qinyou An(Wuhan University of Technology), Xu Xu(Wuhan University of Technology), Xue Liu(Wuhan University of Technology), Qingjie Zhang(Wuhan University of Technology)
Proceedings of the National Academy of Sciences
November 12, 2012
10.1073/pnas.1210315109
Cited by 329Open Access
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Abstract

Lithium-air batteries have captured worldwide attention due to their highest energy density among the chemical batteries. To provide continuous oxygen channels, here, we synthesized hierarchical mesoporous perovskite La(0.5)Sr(0.5)CoO(2.91) (LSCO) nanowires. We tested the intrinsic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity in both aqueous electrolytes and nonaqueous electrolytes via rotating disk electrode (RDE) measurements and demonstrated that the hierarchical mesoporous LSCO nanowires are high-performance catalysts for the ORR with low peak-up potential and high limiting diffusion current. Furthermore, we fabricated Li-air batteries on the basis of hierarchical mesoporous LSCO nanowires and nonaqueous electrolytes, which exhibited ultrahigh capacity, ca. over 11,000 mAh⋅g(-1), one order of magnitude higher than that of LSCO nanoparticles. Besides, the possible reaction mechanism is proposed to explain the catalytic activity of the LSCO mesoporous nanowire.

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