Controllable Synthesis of Mesoporous Co3O4 Nanostructures with Tunable Morphology for Application in Supercapacitors
Controllable Synthesis of Mesoporous Co3O4 Nanostructures with Tunable Morphology for Application in Supercapacitors
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DOI：
10.1002/chem.200802671
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发表时间：
2009-01-01
影响因子：
4.3
通讯作者：
Qian, Yitai
中科院分区：
文献类型：
--
作者：
Xiong, Shenglin;Yuan, Changzhou;Qian, Yitai
新型和复杂的介孔二维和三维结构的氧化物半导体Co 3 O 4，包括纳米片，几乎单分散的微球，自组装的纳米片，和铜币样的纳米片，已经通过一个简单的二元溶液路线和顺序的热分解在大气压下合成。详细讨论了不同反应条件对产物形貌的影响。结果表明，水和乙醇胺（EA）的体积比对前驱体的形貌起着至关重要的作用。相应的前驱体的热分解导致介孔结构的形成。通过X射线衍射、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）和拉曼光谱对产物进行了表征。通过循环伏安法（CV）和恒流充放电测试研究了Co 3 O 4电极的电化学性能。电化学实验表明，在KOH电解质溶液（3 M）中，Co 3 O 4纳米片的比电容高于Co 3 O 4微球的比电容.此外，Co 3 O 4纳米片电极表现出良好的倍率性能，并在KOH（3 M）电解质溶液中在5 mA cm（-2）的电流密度下保持93%的初始容量。结果表明，Co 3 O 4纳米片可能作为超级电容器的电极材料具有潜在的应用前景。
Novel and complex mesoporous 2D and 3D architectures of the oxide semiconductor Co3O4, including nanosheets, nearly monodisperse microspheres that are self-assembled from nanosheets, and copper-coin-like nanosheets, have been synthesized through a facile binary-solution route and sequential thermal decomposition at atmospheric pressure. The influence of different reaction conditions on the morphology of the products has been discussed in detail. The results revealed that the volume ratio of H2O and ethanolamine (EA) play a crucial role in the morphology of the precursor. The thermal decomposition of the corresponding precursor leads to the formation of the mesoporous structure. The products have been characterized by X-ray diffraction techniques, field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and Raman spectroscopy. The electrochemical properties of the Co3O4 electrodes were investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge measurements. The electrochemical experiments revealed that the specific capacitance of the Co3O4 nanosheets was higher than that of the Co3O4 microspheres in a KOH electrolyte solution (3 M). Furthermore, the Co3O4, nanosheet electrodes exhibited good rate capabilities, and maintained 93% of the initial capacity at a current density of 5 mA cm(-2) in a KOH (3 M) electrolyte solution. The results show that Co3O4 nanosheets might have potential applications as electrode materials for supercapacitors.