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Nano Research

Article Title

Immobilization of NiS nanoparticles on N-doped carbon fiber aerogels as advanced electrode materials for supercapacitors

Keywords

NiS, cotton wool, carbon fiber aerogels, N-doping, supercapacitors

Abstract

NiS nanoparticles (NPs) with excellent electrochemical capacitance have attractedconsiderable attention as cost-effective energy-storage materials for supercapacitorsin recent years. Preventing the aggregation and increasing the conductivity ofNiS NPs are key to fully realizing their excellent electrochemical properties. Inthis work, NiS/N-doped carbon fiber aerogel (N-CFA) nanocomposites wereobtained easily through the combination of polymerization, carbonization, anda one-step solvothermal reaction. N-CFA derived from polydopamine (PDA)-coated cotton wool was used as a template for the construction of hierarchicalNiS/N-CFA nanocomposites, in which NiS NPs are uniformly immobilized onthe surface of N-CFA. In this nanostructured system, N-CFA containing abundantnanofibers not only provides active regions for the growth of NiS NPs to preventtheir aggregation, but also offers short pathways for the transport of electrons andions. The electrochemical properties of the obtained NiS/N-CFA nanocompositeswere investigated by cyclic voltammetry, galvanostatic charge–discharge, andalternating current impedance measurements. The optimized NiS/N-CFA nanocompositeexhibits a high specific capacitance of 1,612.5 F·g‒1 at a charge/dischargecurrent density of 1 A·g‒1 and excellent rate capacitance retention of 66.7% at20 A·g‒1. The excellent electrochemical properties of NiS/N-CFA nanocompositesmake these materials promising electrode materials for supercapacitors.1 IntroductionSupercapacitors with unique properties such as fastcharge/discharge rates, high power densities, and longcycle lives have been considered to be promisingcandidates for future energy-storage devices [1, 2]. BasedNano ResearchDOI 10.1007/s12274-016-1163-1Address correspondence to Wei Fan, weifan@dhu.edu.cn; Tianxi Liu, txliu@fudan.edu.cn, txliu@dhu.edu.cn

Graphical Abstract

Publisher

Tsinghua University Press

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