Facile Green Route to Ni/Co Oxide Nanoparticle Embedded 3D Graphitic Carbon Nanosheets for High Performance Hybrid Supercapacitor Devices

Cuili Xiang, Yin Liu, Ying Yin, Pengru Huang, Yongjin Zou, Marcus Fehse, Zhe She, Fen Xu, Bing Wu, More Authors

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

The demand for energy storage systems with superior performance has led to the creation of hybrid supercapacitor device. With proper designs, the hybrid supercapacitive materials can achieve high performance while reducing the overall cost. Herein, a novel method is developed for preparing three-dimensional hierarchical graphitic carbon nanocomposites with highly dispersed mixed Co-Ni oxide nanoparticles (Co-Ni-O/3DG) by a facile one-pot process involving carbonization and subsequent oxidation of metal ion doped biopolymer precursors. The mixed metal nanoparticles produced during carbonization enabled a top-down preparation of 3D graphitic carbon nanosheets. The nanocomposites were fully characterized and showed excellent electrochemical performance supported by the DFT calculation. Specific capacitance of 1586 F·g -1 was achieved (current density 1.0 A·g -1 ), with capacitance retention of 94.5% after 10 000 cycles demonstrating exceptional cycling stability. In an asymmetric full-cell system using a Co-Ni-O/3DG positive electrode, high energy densities of 32.8-54.7 Wh kg -1 associated with very high power densities of 11358-748.6 W kg -1 were obtained, comparable to the most advanced contemporary supercapacitive materials, while they also possesses an improved cyclability as well as using biosourced staring materials, underlining the electrode's potential application in hybrid supercapacitor devices.

Original languageEnglish
Pages (from-to)3389-3399
JournalACS Applied Energy Materials
Volume2
Issue number5
DOIs
Publication statusPublished - 2019

Keywords

  • cobalt oxide
  • graphitic carbon nanosheets
  • hybrid supercapacitor
  • nickel oxide
  • pseudocapacitance

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