Abstract
Herein, hollow porous CuO-CuCo(2)O(4) dodecahedrons are synthesized by using a simple self-sacrificial metal-organic framework (MOF) template, which resulted in dodecahedron morphology with hierarchically porous architecture. When evaluated as a cathodic electrocatalyst in lithium-oxygen batteries, the CuO-CuCo(2)O(4) composite exhibits a significantly enhanced electrochemical performance, delivering an initial capacity of 6844 mA h g(-1) with a remarkably decreased discharge/charge overpotential to 1.15 V (vs. Li/Li(+)) at a current density of 100 mA g(-1) and showing excellent cyclic stability up to 111 charge/discharge cycles under a cut-off capacity of 1000 mA h g(-1) at 400 mA g(-1). The outstanding electrochemical performance of CuO-CuCo(2)O(4) composite can be owing to the intrinsic catalytic activity, unique porous structure and the presence of substantial electrocatalytic sites. The ex situ XRD and SEM are also carried out to reveal the charge/discharge behavior and demonstrate the excellent reversibility of the CuO-CuCo(2)O(4) based electrode.