Shape-controlled synthesis of porous Co3O4 nanostructures for application in supercapacitors
Shape-controlled synthesis of porous Co3O4 nanostructures for application in supercapacitors
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DOI：
10.1039/c0jm00867b
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发表时间：
2010-01-01
影响因子：
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通讯作者：
Lou, Xiong Wen (David)
中科院分区：
文献类型：
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作者：
Zhu, Ting;Chen, Jun Song;Lou, Xiong Wen (David)
在这项工作中，我们报告了一种用于形状控制合成碳酸钴/氢氧化钴中间体的简便方法。通过改变前体（醋酸钴）浓度和聚乙二醇与水的体积比等实验参数，合成了三种不同的结构，即一维（1D）针状纳米棒、二维（2D）叶状纳米片和三维（3D）椭圆形微粒。通过对这些制备好的中间体进行退火，获得了相纯的四氧化三钴 (Co3O4)，形态没有明显改变。这些具有独特纳米结构的产品具有相对较高的比表面积（86.1-121.5 m(2) g(-1)），测试了其在超级电容器中的潜在应用。结果表明，这些多孔 Co3O4 结构表现出良好的电容特性，具有高电容和良好的保留能力。针状纳米棒的最高电容为111 F g(-1)，并且在1000次充放电循环后仍能保持88.2%的电容。
In this work, we report a facile approach for the shape-controlled synthesis of cobalt carbonate/hydroxide intermediates. Three different structures, viz., one-dimensional (1D) needle-like nanorods, two-dimensional (2D) leaf-like nanosheets, and three-dimensional (3D) oval-shaped microparticles, have been synthesized through varying experimental parameters such as precursor (cobalt acetate) concentrations and volume ratio of polyethylene glycol to water. Phase-pure tricobalt tetroxide (Co3O4) has been obtained by annealing these as-prepared intermediates without significant alterations in morphology. With relatively high specific surface areas of 86.1-121.5 m(2) g(-1), these products with distinct nanostructures were tested for their potential application in supercapacitors. The results show that these porous Co3O4 structures exhibit promising capacitive properties with high capacitance and good retention. The needle-like nanorods show the highest capacitance of 111 F g(-1), and 88.2% of which can still be maintained after 1000 charge-discharge cycles.