Synthesis, characterization and electrochemical performance of graphene decorated with 1D NiMoO4·nH2O nanorods

Abstract

One-dimensional NiMoO4 · nH2O nanorods and their graphene based hybrid composite with good electrochemical properties have been synthesized by a cost effective hydrothermal procedure. The formation of the mixed metal oxide and the composite was confirmed by XRD, XPS and Raman analyses. The morphological characterizations were carried out using FESEM and TEM analyses. The materials were subjected to electrochemical characterization through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) studies with 6 M KOH as the supporting electrolyte. For NiMoO4 · nH2O, a maximum specific capacitance of 161 F g(-1) was obtained at 5 A g(-1) current density, accompanied with an energy density of 4.53 W h kg(-1) at a steady power delivery rate of 1125 W kg(-1). The high utility of the pseudocapacitive NiMoO4 · nH2O was achieved in its graphene based composite, which exhibited a high specific capacitance of 367 F g(-1) at 5 A g(-1) current density and a high energy density of 10.32 W h kg(-1) at a power density of 1125 W kg(-1) accompanied with long term cyclic stability.

Rapid microwave-assisted synthesis of mesoporous NiMoO4 nanorod/reduced graphene oxide composites for high-performance supercapacitors

“…Similarly, the Mo 3d emission spectrum (Fig. 6c) showed two remarkable peaks with binding energies at 232.4 and 235.5 eV, corresponding to Mo 3d5/2 and Mo 3d3/2 [43], respectively. The Mo 3d5/2-Mo 3d3/2 energy separation was around 3.1 eV, corresponding to the Mo 6+ oxidation state in the molybdate ion.…”

“…The selected-area electron diffraction (inset of Fig. 7d) of NiMoO4 demonstrated its single-crystal nature [43]. The composition of the NiMoO4-rGO was also determined by energydispersive X-ray spectroscopy (Fig.…”

Simple Synthesis and Supercapacitive Performances of NiMoS4 Particles

“…Moreover, the capacitances of NiMoS4 are higher than those for the component sulfides like MoS2 (122 F/g at 0.5 A/g [8]; 142 F/g at 0.59 A/g [9], 70 F/g at 1 A/g [10]) and NiS (250 F/g at 1 A/g [11]). In addition, they are also superior to those for the reported NiMoO4 (161 F/g at 5 A/g) [12]. The high capacitance of NiMoS4 may be on account of the multiple valences, high conductivity of sulfides, as well as the synergistic effect of Ni and Mo [13].…”

Three‐Dimensional NiMoO4 Nanosheets Supported on a Carbon Fibers@Pre‐Treated Ni Foam (CF@PNF) Substrate as Advanced Electrodes for Asymmetric Supercapacitors

“…The bindingenergy peak and the satellite peak of Ni 2p 3/2 could be examined at 855.9 and 861.7 eV,r espectively;w hereas the Ni 2p 1/2 level was confirmed by the binding-energy peak at 873.2 eV and the satellite peak at 880 eV.M oreover,i ti sasignature of the Ni 2 + oxidation state that the main binding-energy peaks of Ni 2p 3/2 and Ni 2p 1/2 are separated by 17.3 eV. [14,15] The Mo 3d XPS spectrum of NiMoO 4 displays two peaks at 235 and 232 eV corresponding to Mo 3d 3/2 and Mo 3d 5/2 ,w hich were assigned to Mo 6 + in NiMoO 4 ( Figure 2e). [16] The O1 sX PS spectrum (Figure 2f)s hows as trong peak around5 30.5 eV,w hich agrees well with the characteristicp eak of O1 si nN iMoO 4 .T herefore, the nanoflakes growno nt he CF@PNF substrate are mainly Figure 2.…”