Preparation and performance of tubular nanoflaky (Ni, Co, Mn) oxides with hierarchical mesoporous structure

作者：Wang, Hao; Fu, Yanqing; Wang, Xianyou^*; Gao, Jiao; Zhang, Youwei; Zhao, Qinglan

来源：Journal of Alloys and Compounds, 2015, 639: 352-358.

DOI：10.1016/j.jallcom.2015.03.178

• Supercapacitor
• Transition metal oxide
• Carbon nanotube
• Pseudocapacitance
• Hierarchical architecture

The nickel cobalt manganese oxide (NCMO/CNT) with hierarchical tubular nanoflaky structure is intentionally designed and synthesized via a facile method by using carbon nanotube (CNT) as a backbone template, then the nickel cobalt manganese oxide with nanosheet-like nanotube structure (NCMONST) is synthesized after removed successfully the CNT templates. The morphology, structure and physico-chemical properties of the NCMONST samples are characterized by field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and nitrogen adsorption-desorption isotherms. The results reveal that the NCMO shell with a thickness of 0.2 lm grows uniformly on the surface of the CNT with a diameter of 0.1 mu m. After calcined NCMO/CNT in air, the mesoporous NCMONST is successfully obtained. The as-prepared NCMONST maintains the tubular and sheets-like structure of NCMO/CNT, and possesses a high specific surface area of 134.1 m(2) g(-1), large pore volume of 0.609 cm(3) g(-1) and broad pore-size distribution. The electrochemical results show that the NCMONST exhibits a high specific capacitance of 680 F g(-1) at 1 A g(-1), excellent rate capability of 38% at 20 A g(-1) and good capacity retention of 88% after 1000 cycles. Therefore, the transition metal oxide with porous structure is a promising electrode candidate for the application of supercapacitors.

• 出版日期2015-8-5
• 单位湘潭大学