Synthesis and Supercapacitor Property of Ni-doped Co3O4 Nanowire Array

doi:10.15541/jim20170287

Abstract

Abstract:

The novel Ni-doped Co₃O₄ nanowire array was synthesized successfully by electrochemical deposition with the aid of anodic aluminum oxide (AAO) template, followed by oxidation at high temperature. The phase composition and morphology were characterized by X-ray diffraction, scanning electron microscope and high resolution transmission electron microscope. The results show that as-prepared Ni-doped Co₃O₄ nanowire array perpendicular to the substrate displays highly uniform shape and size, with an average diameter of 80 nm and length of 1.4 μm. The nanowire with coarse surface is composed of small crystalline nanoparticles. Average atom ratio of Co to Ni in the nanowire is 20 : 1. Electrochemical characterization was performed using cyclic voltammetry and galvanostatic charge-discharge in a 2 mol/L KOH aqueous solution electrolyte. The test results indicate that the Ni-doped Co₃O₄ nanowire array exhibits a specific capacitance of 173 mF/cm² at current density of 10 mA/cm², and a good cycling stability with 98% capacity retention over 1000 cycles. Excellent electrochemical performance can be attributed to the large specific surface area and the enhanced conductivity achieved by incorporating of Ni.

Key words: nanowires, Co₃O₄, doping, template method, supercapacitor

CLC Number:

O646

WANG Jun-Xia, ZHAO Jian-Wei, QIN Li-Rong, ZHAO Bing-Ling, JIANG Zheng-Yan. Synthesis and Supercapacitor Property of Ni-doped Co₃O₄ Nanowire Array[J]. Journal of Inorganic Materials, 2018, 33(5): 501-506.

Figures/Tables 8

Fig. 1 Fabrication process of the electrode based on nanowire array

Fig. 2 SEM images of the nanowire array before oxidation with different magnification

Fig. 3 SEM images of the nanowire array after oxidation with different magnifications

Fig. 4 HRTEM image of the Ni-doped Co3O4 nanowire array and corresponding SAED pattern (inset)

Fig. 5 XRD pattern (a) and EDS pattern (b) of the Ni-doped Co3O4 nanowire array

Fig. 6 (a) CV curves at different scan rate and (b) Galvanostatic charge-discharge curves at different current densities for the electrode

Table 1 Comparison of the capacitances between product in this study and other similar materials in literature

Electrode materials	Current density	Specific capacitance	Ref.
Ni-doped Co₃O₄ nanowire array	10.0 mA·cm^-2	173.00 mF·cm^-2	This work
ZrO₂-WO₃ nanotubular arrays	10.0 mV·s^-1	40.03 mF·cm^-2	[20]
NiO nanoflake/glass electrodes	10.0 mV·s^-1	74.80 mF·cm^-2	[21]
MnO₂-TiO₂/C nano arrays	0.1 mA·cm^-2	26.10 mF·cm^-2	[22]
MnO₂/TiO₂ nanotube arrays	64.0 mA·cm^-2	40.40 mF·cm^-2	[23]
Aligned carbon nanotubes	800.0 mV·s^-1	2.61 mF·cm^-2	[24]

Fig. 7 Change of specific capacitance and columbic efficiency of the electrode with cycle number

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Synthesis and Supercapacitor Property of Ni-doped Co₃O₄ Nanowire Array

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