A precursor-derived morphology-controlled synthesis method for mesoporous Co3O4 nanostructures towards supercapacitor application
A precursor-derived morphology-controlled synthesis method for mesoporous Co3O4 nanostructures towards supercapacitor application
复制标题
一种用于超级电容器应用的介孔 Co3O4 纳米结构的形貌控制合成方法
DOI：
10.1039/c6ce01921h
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发表时间：
2016-01-01
期刊：
影响因子：
3.1
通讯作者：
Cheng, Xin
中科院分区：
文献类型：
--
作者：
Ding, Kun;Zhang, Xiao;Cheng, Xin
控制合成各种各样的纳米结构对于理解与表面结构相关的性质和探索潜在的应用是有价值的。在此，不同形态的Co3O4前驱体水热合成制备介孔Co3O4纳米结构。重要的是，通过控制溶液中的组分（例如阴离子、阳离子和水解剂）来独立地调节前体的形态、尺寸和结晶相。通过改变溶液中的阴离子，Co3O4前驱体的微观结构明显地由多孔的六边形转变为纳米针状。煅烧后，所制备的前驱体转化为介孔Co3O4纳米结构，其形貌和尺寸得到很好的保留。探讨了实验条件对Co3O4前驱体生长的影响，并提出了相应的生长机理。此外，还测试了不同形貌Co3O4的电化学性能。结果表明，由六方纳米片组装的三维层次花状Co3O4在10 000次循环后表现出较高的比电容（0.5 A g− 1时为327.3 F g− 1）和优异的保持率（5 A g−1时为96.07%）。 这种阴离子辅助的合成方法可以推广到其他过渡金属氧化物的制备。
The controlled synthesis of multifarious nanostructures is valuable for understanding the properties associated with the surface structure and for exploring potential applications. Herein, various morphological Co3O4 precursors were synthesized hydrothermally for fabricating mesoporous Co3O4 nanostructures. Importantly, the morphology, size, and crystalline phase of precursors were independently tuned by controlling the components in solution (e.g. anions, cations, and hydrolysis agents). The microstructure of Co3O4 precursors has obviously changed from porous hexagons to nanoneedles by changing the anions in solution. After calcination, as-prepared precursors were converted into mesoporous Co3O4 nanostructures, and their morphology and size were well preserved. The effect of experimental conditions on the growth of Co3O4 precursors was explored, and the corresponding growth mechanism was proposed. Moreover, the electrochemical properties of Co3O4 with different morphologies were tested. The results showed that the 3D hierarchical flower-like Co3O4 assembled by hexagonal nanosheets exhibited higher specific capacitance (327.3 F g−1 at 0.5 A g−1) with excellent retention (96.07% at 5 A g−1) after 10 000 cycles. It is believed that this anion-assisted synthetic approach can be extended to the preparation of other transition metal oxides.