Comparison of the Electrochemical Performance of NiMoO₄Nanorods and Hierarchical Nanospheres for Supercapacitor Applications

Abstract

Much attention has been paid to exploring electrode materials with enhanced supercapacitor performance as well as relatively low cost and environmental friendliness. In this work, NiMoO4 nanospheres and nanorods were synthesized by facile hydrothermal methods. The hierarchical NiMoO4 nanospheres were about 2.5 μm in diameter and assembled from thin mesoporous nanosheets with a thickness of about 10-20 nm. The NiMoO4 nanorods were about 80 nm in diameter and about 300 nm to 1 μm in length. Their electrochemical properties were investigated for use as electrode materials for supercapacitors (SCs). The NiMoO4 nanospheres exhibited a higher specific capacitance and better cycling stability and rate capability, which were attributed to their large surface area and high electrical conductivity. The specific capacitances were 974.4, 920.8, 875.5, 859.1, and 821.4 F/g at current densities of 1, 2, 4, 6, and 10 A/g, respectively. Remarkably, the energy density was able to reach 20.1 Wh/kg at a power density of 2100 W/kg. After 2000 cycles, the NiMoO4 nanospheres still displayed a high specific capacitance of about 631.8 F/g at a current density of 5 A/g. These results implied that the hierarchical NiMoO4 nanospheres could be a promising candidate for use as high-performance SCs.

Facile synthesis of Cu2O microstructures and their morphology dependent electrochemical supercapacitor properties

“…This shi in peak position is related to internal resistance of the electrode, which conrms the pseudocapacitive characteristics. 35,48 Indeed, this shi was attributed to an increase in the charge diffusion polarization with the pseudocapacitive electrode. 49 The increase in the current response with the scan rate also suggests that the kinetics of interfacial faradic redox reactions and the rates of electronic and ionic transport are signicantly fast even when the scan rate is as high as 100 mV s À1 .…”

New insight into high-temperature driven morphology reliant CoMoO4 flexible supercapacitors

“…The electrochemical properties of nanorods and hierarchical nanospheres of NiMoO 4 have been well studied and compared with respect to their morphology. 31 The nanospheres of NiMoO 4 showed a higher specific capacitance and better cycling stability due to their large surface area and high electrical conductivity. Xia et al 32 used a facile hydrothermal method to synthesize CoMoO 4 -graphene for supercapacitor applications.…”

Facile synthesis of reduced graphene oxide/peroxomolybdate(VI)–citrate composite and its potential energy storage application

“…Their high catalytic activity, good electrochemical properties and environmental friendliness have driven them to energy storage applications [7]. The specific capacity reported for various molybdate-based supercapacitors for single electrode obtained using three electrode system was as high as 65 F/g for Ag 6 Mo 10 O 33 nanostructures [8], 170 F/g for CoMoO 4 nanospheres [9], 187 F/g for MnMoO 4 /CoMoO 4 nanowires [10], 200 F/g for α-MnMoO 4 [11], 212 F/g for carbon sphere@NiMoO 4 [12], and 974F/g for NiMoO 4 nanorods and nanospheres [13]. While using two-electrode system in a symmetric configuration, 81F/g was obtained for a-MnMoO 4 [11] and 53 F/g for MoS 2 /RGO nanocomposite [14].…”