Metal–organic framework derived hollow porous CuO–CuCo2O4 dodecahedrons as a cathode catalyst for Li–O2 batteries |
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Authors: | Shu-ying Zhen Hai-tao Wu Yan Wang Na Li Hao-sen Chen Wei-li Song Zhen-hua Wang Wang Sun Ke-ning Sun |
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Institution: | Institute of Advanced Structure Technology, Beijing Institute of Technology, 100081 Beijing China, Fax: +86-010-68918696, +86-010-68918696 ; Beijing Key Laboratory for Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081 China, |
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Abstract: | Herein, hollow porous CuO–CuCo2O4 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–CuCo2O4 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–CuCo2O4 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–CuCo2O4 based electrode.Metal–organic framework derived porous CuO–CuCo2O4 dodecahedrons as a cathode catalyst for Li–O2 batteries with significantly enhanced rate and cyclic performance. |
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