Electrochemically activated 3D Mn doped NiCo hydroxide electrode materials toward high-performance supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Metal doping and electrochemical reconstruction are key for advanced supercapacitor electrode materials.
• Combining these methods for electrode material construction and supercapacitor application is unexplored.

Purpose of the Study:

• To design and synthesize a novel Mn-doped NiCo sulfide material with an open 2D nanosheet structure.
• To improve energy storage performance through electrochemical reconstruction.
• To investigate the structural and phase transformations during reconstruction for supercapacitor applications.

Main Methods:

• Synthesis of Mn-doped NiCo sulfide via a doping route.
• Electrochemical activation for material reconstruction.
• Structural and phase analysis of the reconstructed material.
• Electrochemical performance testing of supercapacitors using the material.

Main Results:

• A 3D channel structure and phase transformation from metal sulfide to metal hydroxide were achieved via reconstruction.
• The optimized electrode material delivered a specific capacitance of 1462 C g^-1 at 1 A g^-1.
• The asymmetric supercapacitor showed an energy density of 141.8 Wh kg^-1 and 96.6% capacitance retention after 5000 cycles.

Conclusions:

• The combined approach of Mn doping and electrochemical reconstruction is effective for creating high-performance supercapacitor electrode materials.
• The in-situ self-reconstructed 3D Mn-doped NiCo hydroxide exhibits excellent electrochemical properties.
• This strategy offers a viable pathway for developing advanced energy storage devices.