Design of three dimensional hybrid Co3O4@NiMoO4 core/shell arrays grown on carbon cloth as high-performance supercapacitors
Design of three dimensional hybrid Co3O4@NiMoO4 core/shell arrays grown on carbon cloth as high-performance supercapacitors
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碳布上生长的三维混合Co3O4@NiMoO4核/壳阵列作为高性能超级电容器的设计
DOI：
10.1039/c5ra28077j
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发表时间：
2016-02
期刊：
影响因子：
3.9
通讯作者：
Sun Ming
中科院分区：
文献类型：
--
作者：
Li Yongfeng;Wang Hui;Jian Jianming;Fan Yun;Yu Lin;Cheng Gao;Zhou Junli;Sun Ming
采用合理设计的杂化纳米结构复合材料作为超级电容器电极，其电化学性能优于单一结构材料。本文采用两步水热法设计并合成了直接生长在碳布上的均匀三维（3D）混合纳米线/纳米片阵列Co3O4@NiMoO4。通过SEM、XRD、XPS、TEM和N2吸附/解吸等温线等一系列表征，验证了制备的层叠型核壳杂化纳米结构结合了Co3O4纳米线良好的速率性能和NiMoO4纳米片的高比表面积的优点。作为无粘结剂电极，制备的三维杂化纳米复合材料在电流密度为3 mA cm−2时获得了3.61 F cm−2的高面电容，当电流密度从3 mA cm−2增加到15 mA cm−2时，电容保持率为82%。此外，与单一结构的Co3O4材料相比，杂化产物具有更低的体积电阻和更低的电荷转移电阻。优异的电化学性能和简单的制造工艺表明，这种混合纳米结构材料在高性能超级电容器中具有潜在的应用前景。
Electrodes with rationally designed hybrid nanostructure composites can have superior electrochemical performance for supercapacitors to single structured materials. In this work, the uniform three dimensional (3D) hybrid Co3O4@NiMoO4 nanowire/nanosheet arrays directly grown on carbon cloth were designed and synthesized via a two-step hydrothermal method. A series of characterizations of SEM, XRD, XPS, TEM and N2 adsorption/desorption isotherms were used to verify the hierarchical core/shell hybrid nanostructure of as-prepared products, which combines the advantages of the good rate capability of Co3O4 nanowires and the high surface area of NiMoO4 nanosheets. As a binder-free electrode, the fabricated 3D hybrid nanocomposite achieves a high areal capacitance of 3.61 F cm−2 at a current density of 3 mA cm−2 and a capacitance retention of 82% with the increase of current density from 3 to 15 mA cm−2. Besides, the hybrid nanostructured product also exhibits lower bulk resistance and lower charge transfer resistance than single structured Co3O4 material. The outstanding electrochemical behaviour and the facile fabrication process suggest that this hybrid nanoarchitecture material has potential application in high-performance supercapacitors.
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