Heterostructured Ni(OH)2-Co(OH)2 composites on 3D ordered Ni-Co nanoparticles fabricated on microchannel plates for advanced miniature supercapacitor

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

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Author(s)

  • Mai Li
  • Shaohui Xu
  • Yiping Zhu
  • Pingxiong Yang
  • Lianwei Wang

Detail(s)

Original languageEnglish
Pages (from-to)364-371
Journal / PublicationJournal of Alloys and Compounds
Volume589
Online published7 Dec 2013
Publication statusPublished - 15 Mar 2014

Abstract

Silicon microchannel plates (Si-MCPs) coated with a layer of nickel cobalt alloy (NCA) constitute an excellent substrate for miniature supercapacitors. Nanoscale Ni(OH)2-Co(OH)2 composite particles serving as the active materials are electrodeposited on ordered three-dimensional (3D) NCA/Ni/Si-MCPs and the Ni(OH)2-Co(OH)2 composites have different structures depending on the amount of Co(OH)2 in Ni(OH)2. The nickel hydroxide synthesized from a water-acetone 0.1 M Ni(NO3)2×6H2O solvent has a compact structure, but that from a 0.1 M Ni(NO3)2×6H 2O solvent containing 5% Co(NO3)2×6H 2O is loosely packed with nanoparticles and that from a 0.1 M Ni(NO3)2×6H2O solvent containing 10% Co(NO3)2×6H2O contains many nanoparticles. Addition of Co(NO3)2×6H2O results in a smooth morphology. The smooth structure is also observed from active materials produced in 20% and 30% Co(NO3)2× 6H2O solvents. Five types of electrode materials are investigated from the perspective of electrochemical capacitors by conducting cyclic voltammogram, galvanostatic charge-discharge measurements, and electrochemical impedance spectroscopy. In this experiment, the highest specific capacitance of 7.8 F cm-2 is achieved in the samples prepared in 10% Co(NO 3)2×6H2O at a discharge current density of 20 mA cm-2. It is much better than 1.46 F cm-2 observed from previous attempts and the materials have excellent capacity retention. © 2013 Elsevier B.V. All rights reserved.

Research Area(s)

  • Electrochemical capacitors, Electrodeposition, Nanoparticles, Ni-Co alloys, Ordered three-dimensional microchannel plates

Citation Format(s)

Heterostructured Ni(OH)2-Co(OH)2 composites on 3D ordered Ni-Co nanoparticles fabricated on microchannel plates for advanced miniature supercapacitor. / Li, Mai; Xu, Shaohui; Zhu, Yiping; Yang, Pingxiong; Wang, Lianwei; Chu, Paul K.

In: Journal of Alloys and Compounds, Vol. 589, 15.03.2014, p. 364-371.

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