Electrospun carbon nanofiberic coated with ambutan-like NiCo 2 O 4 microspheres as electrode materials
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Research Letter
Electrospun carbon nanofiberic coated with ambutan-like NiCo2O4 microspheres as electrode materials Hua Chen, Department of Polymer Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, People’s Republic of China Guohua Jiang, Department of Polymer Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, People’s Republic of China; National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang), Hangzhou 310018, People’s Republic of China; Key Laboratory of Advanced Textile Materials and Manufacturing Technology (ATMT), Ministry of Education, Hangzhou 310018, People’s Republic of China Weijiang Yu, Depeng Liu, Yongkun Liu, Lei Li, and Qin Huang, Department of Polymer Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, People’s Republic of China Address all correspondence to Guohua Jiang at [email protected] (Received 24 October 2016; accepted 21 February 2017)
Abstract The novel Three-dimensional rambutan-like NiCo2O4 microspheres have been successfully coated onto surface of carbon nanofibers (CNFs) to form NiCo2O4–CNFs hybrids. The composition and microstructure of NiCo2O4–CNFs were characterized by the field-emission scanning electronmicroscopy, x-ray photoelectron spectroscopy, transmission electron microscopy, and x-ray diffractometer. The obtained NiCo2O4–CNFs exhibited a specific capacity of 160 mAh/g at 1 mA/cm2 in 2 M potassium hydroxide aqueous solution. The specific capacity gradually increases with the increasing of cycles; and after 3000 cycles, the specific capacity still can be remained over 90%.
Introduction With the depletion of fossil fuel energy and deterioration of ecological environment, clean and high-efficiency energy storage systems, such as lithium ion batteries, electrochemical supercapacitors, Ni–O batteries, have attracted much more attentions.[1] Among them, electrochemical supercapacitors are regarded as the most promising candidates because of their low-cost, high-power density, faster charge–discharge properties, and long durability.[2] Three-dimensional (3D) microstructures assemble from one-dimensional (1D) (nanowires or nanorods) or two-dimensional (such as nanosheet) have gained much attention owing to their higher specific area and unique characteristics compared with solid structures.[3,4] Such hierarchical microstructures are expected to satisfy the practical needs for the energy-storage devices,[5] sensors,[6] catalysis,[7] and so on. Carbon materials in different dimensions have been widely used in energy storage systems. Among them, 1D carbon nanofibers (CNFs) and carbon nanotubes have several advantages over other forms of carbon materials. Firstly, carbon materials have high aspect ratio which makes it easy to form conductive network at an extremely low percolation.[8] Secondly, carbon materials with large surface area are in favor of deposition and encapsulation of metals and metal oxides even in high concentrations when employed as substrates or supports.[9–11] Thirdly, their particular interconnected porou
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