Self-Template Synthesis of Hybrid Porous Co3 O4 -CeO2 Hollow Polyhedrons for High-Performance Supercapacitors.
Self-Template Synthesis of Hybrid Porous Co3 O4 -CeO2 Hollow Polyhedrons for High-Performance Supercapacitors.
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DOI：
10.1002/asia.201701582
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
Chengzhen Wei;Kangfei Liu;J. Tao;Xiaoting Kang;Haiyan Hou;Cheng Cheng-Cheng;Daojun Zhang
中科院分区：
文献类型：
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作者：
Chengzhen Wei;Kangfei Liu;J. Tao;Xiaoting Kang;Haiyan Hou;Cheng Cheng-Cheng;Daojun Zhang
在这项工作中，混合多孔Co 3 O 4-CeO 2空心多面体已成功地获得通过一个简单的阳离子交换路线，然后热处理。在合成过程中，首先制备ZIF-67多面体骨架，其不仅作为交换的Ce 3+离子的主体，而且作为合成混合多孔Co 3 O 4-CeO 2中空多面体的模板。当用作超级电容器的电极材料时，混合多孔Co 3 O 4-CeO 2中空多面体在2.5 A g-1下提供1288.3 F g-1的大比电容和显著的长寿命循环稳定性（在6000次循环后损失<3.3%）。此外，组装了基于混合多孔Co 3 O 4-CeO 2中空多面体的非对称超级电容器（ASC）器件。ASC装置的能量密度为54.9 W·h·kg-1，即使在5100 W·kg-1的功率密度下，其能量密度仍能保持在44.2 W·h·kg-1，这表明其在电化学储能方面有着广阔的应用前景。更重要的是，我们相信，本路线是一个简单和通用的策略，用于制备具有所需结构，化学组成和应用的其他混合金属氧化物。
In this work, hybrid porous Co3 O4 -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 Co3 O4 -CeO2 hollow polyhedrons. When utilized as electrode materials for supercapacitors, the hybrid porous Co3 O4 -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 Co3 O4 -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.