Publication Details

Liu, L., Guo, H., Hou, Y., Wang, J., Fu, L., Chen, J., Liu, H., Wang, J. & Wu, Y. (2017). A 3D hierarchical porous Co3O4 nanotube network as an efficient cathode for rechargeable lithium-oxygen batteries. Journal of Materials Chemistry A, 5 (28), 14673-14681.


Herein, a three-dimensional (3D) hierarchical porous Co 3 O 4 nanotube (Co 3 O 4 HPNT) network was prepared using a polypyrrole nanofiber (PPyNF) as a sacrificial template. When employed as a cathode for lithium-oxygen batteries, the 3D Co 3 O 4 HPNT network demonstrated superior bifunctional electrocatalytic activities towards both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), with a relatively low charge overpotential of 99 mV and a high discharge/charge capacity of 4164/4299 mA h g -1 . High-resolution scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy measurements on Co 3 O 4 HPNT-based cathode after discharge/recharge showed reversible formation and decomposition of Li 2 O 2 . This superior performance is ascribed to the 3D web-like porous tubular structure, which facilitates rapid oxygen flow, provides enough void volume for insoluble Li 2 O 2 deposition, and increases the catalytic utilization of Co 3 O 4 . Moreover, the hierarchical porous structure with meso-/nanopores on the walls of the Co 3 O 4 nanotubes facilitates O 2 diffusion, electrolyte penetration, and mass transport of all the reactants.

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