Self‐Template Synthesis of Hybrid Porous Co3O4–CeO2 Hollow Polyhedrons for High‐Performance Supercapacitors |
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Authors: | Prof. Chengzhen Wei Kangfei Liu Jing Tao Xiaoting Kang Haiyan Hou Cheng Cheng Prof. Daojun Zhang |
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Affiliation: | Henan Province Key Laboratory of New Opto-Electronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan, P. R. China |
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Abstract: | In this work, hybrid porous Co3O4–CeO2 hollow polyhedrons have been successfully obtained via a simple cation‐exchange route followed by heat treatment. In the synthesis process, ZIF‐67 polyhedron frameworks are firstly prepared, which not only serve as a host for the exchanged Ce3+ ions but also act as the template for the synthesis of hybrid porous Co3O4–CeO2 hollow polyhedrons. When utilized as electrode materials for supercapacitors, the hybrid porous Co3O4–CeO2 hollow polyhedrons delivered a large specific capacitance of 1288.3 F g?1 at 2.5 A g?1 and a remarkable long lifespan cycling stability (<3.3 % loss after 6000 cycles). Furthermore, an asymmetric supercapacitor (ASC) device based on hybrid porous Co3O4–CeO2 hollow polyhedrons was assembled. The ASC device possesses an energy density of 54.9 W h kg?1, which can be retained to 44.2 W h kg?1 even at a power density of 5100 W kg?1, indicating its promising application in electrochemical energy storage. More importantly, we believe that the present route is a simple and versatile strategy for the preparation of other hybrid metal oxides with desired structures, chemical compositions and applications. |
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Keywords: | electrode materials hollow polyhedrons mesoporous materials self-template synthesis supercapacitors |
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