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3D Hierarchical Porous Co3O4 Nanotube Network as Efficient Cathode for Rechargeable Lithium-Oxygen Batteries

Abstract

Three-dimensional (3D) hierarchical porous Co3O4 nanotube (Co3O4HPNT) network is prepared by using polypyrrole nanofiber (PPyNF) as a sacrificial template. When employed as cathode for lithium oxygen batteries, the 3D Co3O4 HPNT network demonstrated superior bi-functional electrocatalytic activities towards both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), with a rather low charge overpotential of 99 mV and high discharge/charge capacity of 4164/4299 mAh g-1. High resolution scanning electron microscope, X-ray diffraction, and X-ray photoelectron spectroscopy measurements on Co3O4 HPNT based cathode after discharge/recharge showed reversible formation and decomposition of Li2O2. This superior performance is ascribed to the 3D web-like porous tubular structure, which facilitates rapid oxygen flow, provides enough void volume for insoluble Li2O2 deposition, and increases the catalytic utilization of Co3O4. Meanwhile, the hierarchical porous structure with meso/nanopores on the walls of the Co3O4 nanotubes facilitates O2 diffusion, electrolyte penetration, and mass transport of all the reactants.

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Publication details

The article was received on 25 Apr 2017, accepted on 15 Jun 2017 and first published on 16 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03553E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    3D Hierarchical Porous Co3O4 Nanotube Network as Efficient Cathode for Rechargeable Lithium-Oxygen Batteries

    L. Liu, H. Guo, Y. Hou, J. Wang, L. Fu, J. Chen, H. Liu, J. Wang and Y. Wu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03553E

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