Cage-Type Highly Graphitic Porous Carbon-Co3O4 Polyhedron as the Cathode of Lithium-Oxygen Batteries

ACS Applied Materials & Interfaces
Jing TangYusuke Yamauchi

Abstract

A novel cage-type highly graphitic porous carbon-Co3O4 (GPC-Co3O4) polyhedron was designed and successfully prepared for the first time by executing a two-step annealing of core-shell structured metal-organic frameworks (MOFs). The low graphitic carbon cores were selectively removed during the secondary annealing in air atmospheres, leaving the interior voids due to their lower thermal stability compared with the graphitic carbon shells. Inspired by the unique properties of the cage-type GPC-Co3O4 polyhedron, GPC-Co3O4 was assembled as an oxygen electrode for a rechargeable Li-O2 battery without the additional conductive agent. The efficient generation of Li2O2 during discharging and the reversible decomposition of Li2O2 during charging were clearly observed by XRD patterns and SEM images. The GPC-Co3O4 polyhedron integrates the beneficial properties, including high electronic conductivity, the rigid cage-type structure consisting of the mesoporous walls and interior void space, as well as the uniformly embedded catalytically active Co3O4 nanoparticles. As a result, the GPC-Co3O4 cathode displays a low charge overpotential of 0.58 V, a good rate capability, and a long cycle life in a Li-O2 battery.

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Citations

Mar 22, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Barun Kumar Barman, Karuna Kar Nanda
Apr 1, 2016·ACS Applied Materials & Interfaces·Jie JiangHaoshen Zhou
Dec 28, 2016·Advanced Materials·Yusuf Valentino KanetiYusuke Yamauchi
Jun 25, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Jun ZhuXiaoyang Yue
Jan 9, 2017·Environmental Science and Pollution Research International·Caroline SaucierIrineu A S de Brum
Nov 20, 2016·Advanced Materials·Muhammad UsmanKuang-Lieh Lu
Apr 28, 2020·Chemical Science·Liyu ChenQiang Xu
Dec 22, 2016·ACS Applied Materials & Interfaces·Kun LiuMinhua Shao
Oct 7, 2021·Nano-micro Letters·Zhengqing YeRenjie Chen

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