Abstract
NiMoO4/g-C3N4 was fabricated by a hydrothermal method and used as an electrode material in a supercapacitor. The samples were characterized by XRD, FTIR, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to study the physical and structural properties of the as-prepared NiMoO4/g-C3N4 material. The electrochemical responses of pristine NiMoO4 and the NiMoO4/g-C3N4 nanocomposite material were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). From the CD studies, the NiMoO4/g-C3N4 nanocomposite revealed a higher maximum specific capacitance (510 Fg−1) in comparison to pristine NiMoO4 (203 Fg−1). In addition, the NiMoO4/g-C3N4 composite electrode material exhibited high stability, which maintained up to 91.8% capacity even after 2000 charge-discharge cycles. Finally, NiMoO4/g-C3N4 was found to exhibit an energy density value of 11.3 Whkg−1. These findings clearly suggested that NiMoO4/g-C3N4 could be a suitable electrode material for electrochemical capacitors.
Highlights
Owing to the environmental pollution caused by the emission of greenhouse gases from fossil fuels, researchers have been developing renewable energy sources for which new types of energy storage devices, such as fuel cells, batteries, conventional capacitors and electrochemical supercapacitors are required [1]
It was found that the optimized NiMoO4/g-C3N4 composite coated on a carbon paper delivered a high specific capacitance (SC) value with superior cyclic stability, which could serve as a potential candidate for pseudocapacitor applications
The electrochemical properties of NiMoO4 and NiMoO4/g-C3N4 samples were assessed by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS)
Summary
Owing to the environmental pollution caused by the emission of greenhouse gases from fossil fuels, researchers have been developing renewable energy sources for which new types of energy storage devices, such as fuel cells, batteries, conventional capacitors and electrochemical supercapacitors are required [1]. Carbon-based composite materials, namely graphene, activated carbon, carbon aerogel, carbon nanotubes and carbon cloth, are the most used electrode materials in EDLCs [3,6], whereas transition metal oxides/hydroxides are used as electrode materials in pseudocapacitors These metal oxides have attracted the attention of researchers owing to their significant characteristics such as high SC values, high power density and energy density, as well as rapid and reversible redox reactions at the electrode/electrolyte surfaces [7,8]. Ren et al [23] synthesized NiMoO4@Co(OH) core-shell structured nanowire arrays by means of a hydrothermal process and an electrodeposition method route that led to a maximal SC value of 2122 Fg−1 at 4.5 Ag−1 In this present study, we chose NiMoO4 as one of the electrode components. It was found that the optimized NiMoO4/g-C3N4 composite coated on a carbon paper delivered a high SC value with superior cyclic stability, which could serve as a potential candidate for pseudocapacitor applications
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