Hierarchical mesoporous perovskite La0.5Sr0.5CoO2.91 nanowires with ultrahigh capacity for Li-air batteries

被引：309

作者：

Zhao, Yunlong ^{[1
]}

Xu, Lin ^{[1
]}

Mai, Liqiang ^{[1
]}

Han, Chunhua ^{[1
]}

An, Qinyou ^{[1
]}

Xu, Xu ^{[1
]}

Liu, Xue ^{[1
]}

Zhang, Qingjie ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2012年 / 109卷 / 48期

基金：

中国国家自然科学基金;

关键词：

electrocatalysis; energy storage; OXYGEN REDUCTION REACTION; HIGH-PERFORMANCE; OXIDE CATALYSTS; ENERGY-STORAGE; GRAPHENE; CATHODES; DESIGN; CO;

D O I：

10.1073/pnas.1210315109

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 La0.5Sr0.5CoO2.91 (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.

引用

页码：19569 / 19574

页数：6

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