In Situ Growth of Core–Shell Heterostructure CoMoO₄@CuCo₂S₄ Meshes as Advanced Electrodes for High-Performance Supercapacitors

Abstract

The in situ growth strategy provided a multistep method to design and synthesize core−shell heterostructure CoMoO 4 @CuCo 2 S 4 nanomeshes grown on carbon cloth. Owing to the synergistic effect between CoMoO 4 nanosheets and CuCo 2 S 4 nanoneedles in the meshes, such electrodes realize a rapid electron/ion transfer and superior electrical conductivity. Meanwhile, a mechanism for this specific structural material is proposed based on the time factors. The obtained core−shell structured CoMoO 4 @CuCo 2 S 4 electrode displays an outstanding performance with an initial specific capacitance of 1414 F•g −1 at 1 A•g −1 capacitance and 9.8% capacitance decay after 9500 cycles. More notably, the configuration of an asymmetric supercapacitor using optimized active materials and active carbon reveals a preceding energy density of 60.4 Wh•kg −1 . Furthermore, the capacitance retention of the device can reach more than 83.3% when it runs for 4000 cycles.

Modish Designation of Hollow-Tubular rGO–NiMoO4@Ni–Co–S Hybrid Core–shell Electrodes with Multichannel Superconductive Pathways for High-Performance Asymmetric Supercapacitors

“…Here, there is no obvious appearance of NMO nanorods, manifesting the full coverage of NMO nanorods (core) by Ni–Co–LDH nanosheets (shell) before the sulfidation process. By the sulfurization process, the Ni–Co–LDH (shell layer) converted into Ni–Co–sulfide, which might be attributed to the high reactivity and ion-exchange phenomena of S 2– with Ni and Co ions of the shell materials. , Figure c,d outlines the rough and porous nanosheets and decorated images of pure Ni–Co–S nanosheets, which are assumed to possess large surface area and uplift the electrochemical performance of electrode materials. Figure e,f represents the FESEM results of the hybrid rGO–NiMoO 4 @NiCoS hybrid core–shell structure (magnified images are shown in Figure S3).…”

In Situ Growth of Core–Shell Heterostructure CePO4@CuCo2S4 As Advanced Electrodes for High-Performance Supercapacitor

“…The possible redox reactions responsible for CePO 4 @CuCo 2 S 4 /NF are as follows (eqs –): ,, The GCD curves of CeO 2 /NF, CePO 4 /NF, and CuCo 2 S 4 /NF electrodes at different densities are exhibited (Figure S6a–c). In order to further highlight the advantages of CePO 4 @CuCo 2 S 4 active material and reduce the water decomposition reaction during the low current density measurement, 6 M KOH electrolyte is used for testing, thus the voltage window of GCD measured in CePO 4 @CuCo 2 S 4 electrode materials is the most appropriate voltage window at 0∼0.3 V. All GCD curves of CeO 2 /NF, CePO 4 /NF, and CuCo 2 S 4 /NF electrodes reveal approximately symmetrical charge–discharge times at different current densities, which means that they have good reversibility of charging and discharging process.…”

“…With dwindling fossil fuels, research on more efficient, lighter, and more sustainable energy storage devices including various batteries, fuel cells, and supercapacitors is imminent . Among the above energy storage devices, the advantages of high power density, fast charge and discharge rate, admirable cycle stability, low cost, and environmental friendliness make supercapacitors (SCs) stand out and be considered as a promising energy storage device. − However, SCs have obvious shortcomings, mainly relating to the low energy density of SCs in practical applications (∼10 Wh kg –1 in carbon-based double-layer SCs) .…”

Harnessing the Defects at Hetero‐Interface of Transition Metal Compounds for Advanced Charge Storage: A Review

“…Electrostatic selfassembly and manual transfer assembly are two mechanical assembly strategies. [180][181][182][183][184] This synthetic strategy introduces defects by constructing vdWHs through vdW forces between two building blocks. For in situ growth, lattice mismatches are created with chemical bonds between two building blocks in the heterostructure.…”