Facile synthesis of a Ni-based NiCo2O4-PANI composite for ultrahigh specific capacitance

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Yuankai Li
  • Zengxing Zhang
  • Yi Chen
  • Hongmei Chen
  • Yanyun Fan
  • Danfeng Cui
  • Chenyang Xue

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number144646
Journal / PublicationApplied Surface Science
Volume506
Online published14 Nov 2019
Publication statusPublished - 15 Mar 2020

Abstract

Composites of transition metal oxide and conductive polymer have shown great potential in optimizing the electrochemical performance of supercapacitors. Specifically, NiCo2O4/polyaniline (PANI) composites are especially promising, due to the synergetic effect of the two components. Here, we demonstrate the synthesis of a nickel foam-based NiCo2O4-PANI composite, where the PANI is polymerized in situ in aqueous acid, achieving co-doping of Ni2+ and Co2+ in the polymer. The synthesized composite was characterized using X-ray photoelectron spectroscopy, X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. Electrochemical studies indicate that the composite exhibits an ultrahigh specific capacitance of 15.5 F·cm−2 (3108 F·g−1) at a current density of 1 mA·cm−2. In addition, the capacitance retention rate is 96.1% after 1000 charge-discharge cycles at 20 mA·cm−2. Besides, such substrate-dependent design eliminates the electrode adhesion step in assembly compared to the substrate-free nanocomposite. A dual-electrode device made of NiCo2O4-PANI and activated charcoal exhibits a maximum energy density of 77.57 Wh·kg−1 at 800 W·kg−1. All these properties suggest that the materials and the synthesis route used for this NiCo2O4-PANI composite represent a promising strategy to make supercapacitor electrodes.

Research Area(s)

  • Energy density, NiCo2O4-PANI, Specific capacitance, Supercapacitor

Citation Format(s)

Facile synthesis of a Ni-based NiCo2O4-PANI composite for ultrahigh specific capacitance. / Li, Yuankai; Zhang, Zengxing; Chen, Yi; Chen, Hongmei; Fan, Yanyun; Li, Yanfang; Cui, Danfeng; Xue, Chenyang.

In: Applied Surface Science, Vol. 506, 144646, 15.03.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal