Synthesis and Pseudocapacitive Behavior of Nickel Molybdate/Mutiwalled Carbon Nanotubes Composite

doi:10.15541/jim20170442

Abstract

Abstract:

A novel nickel molybdate/mutiwalled carbon nanotubes (NiMoO₄/MWCNTs) composite was synthesized by hydrothermal method using nickel nitrate, sodium molybdate and MWCNTs as raw materials, and the product was characterized by scanning electronic microscopy, energy dispersive spectra, and X-ray diffraction spectra. The scanning electron microscopy results showed that pseudo-spherical NiMoO₄ was wrapped with MWCNTs and all elements were uniformly distributed in the material. Cyclic voltammetry and electrochemical impedance spectra revealed that the presence of MWCNTs greatly improved the redox signal and electron transfer kinetics of NiMoO₄. The capacitance tests further indicated that the composite presented better specific capacitance, rate capability, and cycling stability than the single-component of NiMoO₄, and with a MWCNTs content of 40 mg the composite (NiMoO₄/MWCNTs-40) displayed the best electrochemical performance. At the current density of 2 A/g, the NiMoO₄/MWCNTs-40 composite demonstrated a remarkable specific capacitance of 1071 F/g; while current density was increased to 10 A/g and the capacitance still remained 66.10%. Cyclic stability experiment revealed that the NiMoO₄/MWCNTs-40 composite retained 95.85% of its initial specific capacitance after 2500 charge-discharge cycles at a current density of 10 A/g, exhibiting prominent electrochemical stability.

Key words: nickel molybdate, mutiwalled carbon nanotubes, composite, supercapacitor

CLC Number:

TM535

LIU Tian-Tian, WANG Qing-Hua, LIU Xi-Li, GAO Feng, WANG Qing-Xiang. Synthesis and Pseudocapacitive Behavior of Nickel Molybdate/Mutiwalled Carbon Nanotubes Composite[J]. Journal of Inorganic Materials, 2018, 33(7): 735-740.

Figures/Tables 5

Fig. 1 SEM images of (a, b) NiMoO4 and (c, d) NiMoO4/MWCNTs-40 at different resolution

Fig. 2 (a-e) EDS mapping images of NiMoO4/MWCNTs-40; (f) XRD patterns of NiMoO4/MWCNTs with different amounts of MWCNTs

Fig. 3 EIS spectra of NiMoO4 and NiMoO4/MWCNTs-40 with the inset showing (a) amplified portion of the high frequency region and (b) simulated model for nyquist plots

Fig. 4 (a) CV curves (40 mV/s) and (b) GCD curves (2 A/g) of NiMoO4 and NiMoO4/MWCNTs composites with different contents of MWCNTs with inset showing the relationship between capacitance and MWCNTs contents

Fig. 5 (a) CV curves and (b) GCD curves of NiMoO4/MWCNTs-40, (c) GCD specific capacitances of NiMoO4 and NiMoO4/MWCNTs-40 at different current densities and (d) cycling stability of NiMoO4 and NiMoO4/MWCNTs-40 at the current density of 10 A/g

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