NiCo2S4 nanosheets grown on nitrogen-doped carbon foams as an advanced electrode for supercapacitors

Laifa Shen, Jie Wang, Guiyin Xu, Hongsen Li, Hui Dou, Xiaogang Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

To push the energy density limit of supercapacitors, a new class of electrode materials with favorable architectures is strongly needed. Binary metal sulfides hold great promise as an electrode material for high-performance energy storage devices because they offer higher electrochemical activity and higher capacity than mono-metal sulfides. Here, the rational design and fabrication of NiCo2S4 nanosheets supported on nitrogen-doped carbon foams (NCF) is presented as a novel flexible electrode for supercapacitors. A facile two-step method is developed for growth of NiCo2S4 nanosheets on NCF with robust adhesion, involving the growth of Ni-Co precursor and subsequent conversion into NiCo2S4 nanosheets through sulfidation process. Benefiting from the compositional features and 3D electrode architectures, the NiCo2S4/NCF electrode exhibits greatly improved electrochemical performance with ultrahigh capacitance (877 F g-1 at 20 A g-1) and excellent cycling stability. Moreover, a binder-free asymmetric supercapacitor device is also fabricated by using NiCo2S4/NCF as the positive electrode and ordered mesoporous carbon (OMC)/NCF as the negative electrode; this demonstrates high energy density (≈45.5 Wh kg-1 at 512 W kg-1). A general paradigm for fabricating 3D electrode and high-performance asymmetric supercapacitors is demonstrated via the use of a highly conductive 3D nitrogen-doped carbon foam (NCF) based composite electrode design. This provides efficient and rapid pathways for ion and electron transport, which achieve a simultaneous improvement in the form factor flexibility, light weight, excellent specific energy, and power performance.

Original languageEnglish
Article number1400977
JournalAdvanced Energy Materials
Volume5
Issue number3
DOIs
Publication statusPublished - 2015 Feb 1
Externally publishedYes

Keywords

  • 3D electrodes
  • asymmetric supercapacitors
  • carbon foams
  • NiCoS nanosheets

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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