A Unique 3D Structured NiMoO₄/MoO₃ Heterojunction for Enhanced Supercapacitor Performance

Abstract

The novel 3D nanoporous nickel molybdate-molybdenum trioxide (NiMoO4/MoO3) was fabricated by a facile template free method to exploit the synergistic effect for charge storage performance. The physicoelectrochemical properties of the composite and pristine materials such as NiO, MoO3, and NiMoO4 electrodes were studied and compared together by using XRD, SEM, BET, HRTEM, XPS, CV, EIS, etc. The analysis showed that the NiMoO4 structure prepared a good substrate for MoO3 particles and resulted in an increase in the optical absorption of the composite electrode. According to electrochemical results, the NiMoO4/MoO3 nanostructure has higher electrical conductivity than other materials with the specific capacitance calculated about 720 F·g–1. The results indicated that, by NiMoO4/MoO3 heterojunction formation, the charge transfer and electrochemical performance were strongly increased. Continuous charge/discharge experiment proved the stability of the NiMoO4/MoO3 electrode during 1000 cycles. However, other electrodes lost their stability sharply; the composite one kept its electrochemical performance during continuous cycles. 3D NiMoO4/MoO3 is a good candidate for using as active material in the structure of supercapacitor devices.

Hierarchical MoO3‐MnNi LDH@Cu(OH)2 Core‐Shell Nanorod Arrays Constructed through In‐Situ Oxidation Combined with a Hydrothermal Strategy for High‐Performance Energy Storage

“…The two characteristic peaks at 531.2 eV (Mo−O) and 532.6 eV (−O−H) are ascribed to lattice O, confirming transition metal element Mo exists in the form of oxides, respectively (Figure 3b). The Mo 3d spectrum which is shown in Figure 3c reveals the peaks at 235.5 and 232.3 eV pertain to Mo 3d 3/2 and Mo 3d 5/2 , evidencing the presence of the molybdenum atoms in MoO 3 [36,37] . The high‐resolution spectrum for Cu 2p shown in Figure 3d can be deconvoluted into characteristic peaks located at 954.1 eV and 934.5 eV for Cu 2p 1/2 and Cu 2p 3/2 , along with four satellite peaks (962.18, 943.3, 940.6 and 932.2 eV).…”

“…The Mo 3d spectrum which is shown in Figure 3c reveals the peaks at 235.5 and 232.3 eV pertain to Mo 3d 3/2 and Mo 3d 5/2 , evidencing the presence of the molybdenum atoms in MoO 3 . [36,37] The high-resolution spectrum for Cu 2p shown in Figure 3d can be deconvoluted into characteristic peaks located at 954.1 eV and 934.5 eV for Cu 2p 1/2 and Cu 2p 3/2 , along with four satellite peaks (962.18, 943.3, 940.6 and 932.2 eV). Two characteristic peaks (77.4 eV and 84.7 eV) and satellite peaks (79.9 eV and 90.4 eV) could be discovered in the Mn 3 s spectrum shown in Figure 3e, which confirmed the presence of Mn 2 + .…”

Electrochemical synthesis of MnO 2 / NiO / ZnO trijunction coated stainless steel substrate as a supercapacitor electrode and cyclic voltammetry behavior modeling using artificial neural network

“…Compared with simple thin films, metal oxide heterojunctions are widely used to fabricate supercapacitor electrodes to improve their performance: higher capacitance and higher energy density. [15][16][17][18] Thus, to enhance the efficiency of SCs, the combination of another metals oxide with MnO 2 electrodes are now being used. Synergistic and complementary properties of the combination of both metal oxides concerning their potential application in photocatalysis, SCs, watter splitting and photodetection have attracted considerable attention.…”

“…To further increase their capacitance, one of the proposed solutions is to combine MnO 2 with another materials into a single electrode. Compared with simple thin films, metal oxide heterojunctions are widely used to fabricate supercapacitor electrodes to improve their performance: higher capacitance and higher energy density 15‐18 . Thus, to enhance the efficiency of SCs, the combination of another metals oxide with MnO 2 electrodes are now being used.…”

Self-Assembly Vertical Graphene-Based MoO3 Nanosheets for High Performance Supercapacitors

“…Nowadays, environmental pollution has garnered increasing attention [1,2]. Green renewable energy storage systems have been fast developed instead of traditional nonrenewable resources [3][4][5].…”