Nanofiber NiMoO4/g-C3N4 Composite Electrode Materials for Redox Supercapacitor Applications

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.

Synthesis of Hierarchical Porous Ni1.5Co1.5S4/g-C3N4 Composite for Supercapacitor with Excellent Cycle Stability

“…Two peaks S 2p ( Figure 3d) located at binding energy of 161.4 and 162.5 eV are typical of metal-sulfur bonds [32,33]. The C 1s spectrum (Figure 3e) is fitted into three peaks which could be attributed to sp 2 C-C (284.8 eV), C-O (286.5 eV) and N-C=N or C-(N) 3 (288.5 eV) bonds, respectively [22]. Figure 3f shows the three different kinds of chemical states of nitrogen species in the g-C 3 N 4 .…”

“…The presence of high content nitrogen in g-C 3 N 4 can enhance the electron-donor property of the carbon matrix, resulting in an improvement the electron transport between the active materials [20,21]. Therefore, g-C 3 N 4 is considered a promising candidate material for electrochemical applications because of its rapid charge separation and relatively slow charge recombination property in the electron transfer process [22]. Some recent research has revealed that the combination of pseudocapacitive materials and g-C 3 N 4 can effectively enhance the electrochemical performance of electrode materials for supercapacitor applications.…”

Synergistic effects of nanoarchitecture and oxygen vacancy in nickel molybdate hollow sphere towards a high‐performance hybrid supercapacitor

“…33 The series of peaks noticed at 960, 885, 805, 709, 615, and 486 cm À1 are assigned to the vibrational modes of distorted MoO 6 octahedra, Mo-O-Mo, Mo-O, Ni-O, and Mo-O-Ni, respectively. [34][35][36] The electrochemical performance of the Ov-NiMoO 4 and b-NiMoO 4 electrodes was further investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in a three-electrode setup into 6 M KOH as aqueous electrolyte, as presented in Figure 4 and Figure S2. The comparative CVs of the Ov-NiMoO 4 and b-NiMoO 4 electrodes at a constant scan rate of 25 mV s À1 are exhibited in Figure 4A.…”

Superior supercapacitive performance of Cu2MnSnS4 asymmetric devices

“…Based on their electrochemical charge storage, generally pseudocapacitors exhibit higher specific capacitance values than EDLC capacitors [11,12]. The reason is that in EDLCs, the charges between electrode and electrolyte interfaces are stored by process such as the diffusion/charge accumulation process, whereas in pseudocapacitors, the charge is stored by redox reactions in the active substance (mass) known as the faradaic process [13,14]. Carbon-aero gel, carbon nanotubes, carbon cloth, graphene and activated carbon are used in EDLCs, whereas metal oxides/hydroxides/sulfides are used as an extensive electrode materials in pseudocapacitors [15,16].…”