A core-shell structured design for enhanced supercapacitor performance: coating Ni(OH)₂/Fe(OH)₃ over NiMoO₄...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Supercapacitors are crucial for energy storage.
• Developing high-performance electrode materials is essential for advancing supercapacitor technology.
• Hydroxide-based materials offer potential but face challenges in stability and conductivity.

Purpose of the Study:

• To develop a high-performance supercapacitor electrode material.
• To investigate the synergistic effects of combining NiMoO4 nanofibers with Ni(OH)2/Fe(OH)3 nanostructures.
• To evaluate the electrochemical performance of the novel composite electrode in an asymmetric supercapacitor device.

Main Methods:

• Synthesis of a composite electrode material integrating NiMoO4 nanofibers with Ni(OH)2/Fe(OH)3 nanostructures.
• Characterization of the material's structure and morphology.
• Electrochemical testing of the electrode material, including specific capacitance, rate capability, and cyclic stability.
• Assembly and testing of an asymmetric supercapacitor (ASC) device using the composite electrode.

Main Results:

• The NiMoO4@Ni(OH)2/Fe(OH)3 composite electrode exhibited a high specific capacitance of 1753 F g-1 at 1 A g-1.
• The material demonstrated exceptional rate capability and structural stability due to synergistic effects.
• The ASC device achieved a high energy density of 324 Wh kg-1 at a power density of 33.33 W kg-1.

Conclusions:

• The developed NiMoO4@Ni(OH)2/Fe(OH)3 composite electrode shows great potential for practical energy storage applications.
• Synergistic integration of NiMoO4 nanofibers and Ni(OH)2/Fe(OH)3 nanostructures enhances electrochemical performance.
• This research provides valuable insights for designing advanced supercapacitor materials with improved energy density, power density, and cycle life.