"Carbon quantum dots-glue” enabled high-capacitance and highly stable nickel sulphide nanosheet electrode for supercapacitors

Fangya Qi, Lianyi Shao, Xiaoyan Shi, Fangdan Wu, Haitao Huang, Zhipeng Sun, Alex Trukhanov

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

A facile “carbon quantum dots glue” strategy for the fabrication of honeycomb-like carbon quantum dots/nickel sulphide network arrays on Ni foam surface is successfully demonstrated. This design realizes the immobilization of nanosheet arrays and maintains a strong adhesion to the collector, forming a three-dimensional (3D) honeycomb-like architecture. Thanks to the unique structural advantages, the resulting bind-free electrode with high active mass loading of 6.16 mg cm−2 still exhibits a superior specific capacitance of 1130F g−1 at 2 A g−1, and maintains 80% of the initial capacitance even at 10 A g−1 after 3000 cycles. Furthermore, the assembled asymmetrical supercapacitor delivers an energy density of 18.8 Wh kg−1 at a power density of 134 W kg−1, and outstanding cycling stability (100% of initial capacitance retention after 5000 cycles at 5 mA cm−2). These impressive results indicate a new perspective to design various binder-free electrodes for electrochemical energy storage devices.

Original languageEnglish
Pages (from-to)669-677
Number of pages9
JournalJournal of Colloid and Interface Science
Volume601
DOIs
Publication statusPublished - Nov 2021

Keywords

  • Binder-free electrode
  • Carbon quantum dots
  • Honeycomb-like network arrays
  • Nickel sulphide
  • Supercapacitors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Fingerprint

Dive into the research topics of '"Carbon quantum dots-glue” enabled high-capacitance and highly stable nickel sulphide nanosheet electrode for supercapacitors'. Together they form a unique fingerprint.

Cite this