Interface-Engineered MoSe₂-Co₉S₈ Nanoheterostructures with Enhanced Charge Storage Performance for Supercapacitor...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Cobalt-based chalcogenides show promise for supercapacitors due to their electrochemical properties.
• Limited stability and cyclic performance of these materials hinder practical applications.

Purpose of the Study:

• To design and synthesize MoSe2-Co9S8 nanoheterostructures (NHSs) for enhanced supercapacitor performance.
• To investigate the impact of interfacial engineering on the electrochemical properties of MoSe2-Co9S8 NHSs.

Main Methods:

• A facile hot injection colloidal route was employed to create MoSe2-Co9S8 NHSs.
• Co9S8 nanoparticles (NPs) were epitaxially grown on ultrathin MoSe2 nanosheets (NSs).
• Electrochemical performance was evaluated using specific capacitance, cyclic stability, and coulombic efficiency tests.

Main Results:

• The MoSe2-Co9S8 NHSs electrode exhibited a high specific capacitance of 910.5 F g-1 at 1 A g-1.
• The material demonstrated remarkable stability, retaining ~90% capacitance after 10,000 cycles at 15 A g-1.
• Fabricated coin cells showed 93% Coulomb efficiency and 86% capacitance retention.

Conclusions:

• MoSe2-Co9S8 NHSs offer superior capacitive properties compared to individual components.
• Interfacial engineering significantly enhances the electronic properties, conductivity, and surface area.
• This work provides a pathway for developing transition metal dichalcogenides (TMDs)-derived NHSs for advanced energy storage.