期刊
NANO RESEARCH
卷 9, 期 9, 页码 2747-2759出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1163-1
关键词
NiS; cotton wool; carbon fiber aerogels; N-doping; supercapacitors
类别
资金
- National Natural Science Foundation of China [51125011, 51433001]
NiS nanoparticles (NPs) with excellent electrochemical capacitance have attracted considerable attention as cost-effective energy-storage materials for supercapacitors in recent years. Preventing the aggregation and increasing the conductivity of NiS NPs are key to fully realizing their excellent electrochemical properties. In this work, NiS/N-doped carbon fiber aerogel (N-CFA) nanocomposites were obtained easily through the combination of polymerization, carbonization, and a one-step solvothermal reaction. N-CFA derived from polydopamine (PDA)-coated cotton wool was used as a template for the construction of hierarchical NiS/N-CFA nanocomposites, in which NiS NPs are uniformly immobilized on the surface of N-CFA. In this nanostructured system, N-CFA containing abundant nanofibers not only provides active regions for the growth of NiS NPs to prevent their aggregation, but also offers short pathways for the transport of electrons and ions. The electrochemical properties of the obtained NiS/N-CFA nanocomposites were investigated by cyclic voltammetry, galvanostatic charge-discharge, and alternating current impedance measurements. The optimized NiS/N-CFA nanocomposite exhibits a high specific capacitance of 1,612.5 F center dot g(aEuro'1) at a charge/discharge current density of 1 A center dot g(aEuro'1) and excellent rate capacitance retention of 66.7% at 20 A center dot g(aEuro'1). The excellent electrochemical properties of NiS/N-CFA nanocomposites make these materials promising electrode materials for supercapacitors.
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