Codoping-Induced, Rhombus-Shaped Co3O4 Nanosheets as an Active Electrode Material for Oxygen Evolution

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Cobalt oxide (Co3O4) nanostructures are promising electrocatalysts.
• Controlling doping elements and ratios is crucial for optimizing performance.
• Hydrothermal synthesis offers a scalable method for nanostructure fabrication.

Purpose of the Study:

• To synthesize and characterize Zn2+ and Ni2+ doped Co3O4 nanostructures.
• To investigate the effect of doping elements and ratios on electrocatalytic activity.
• To understand the synergistic effects of codoping on material properties and performance.

Main Methods:

• Direct growth of nanostructured Co3O4 on ITO substrates via hydrothermal method.
• Controlled doping with Zn2+ and Ni2+ at varying concentration ratios.
• Electrocatalytic performance evaluation, including current density measurements.

Main Results:

• Unique structural morphology evolution observed with doping.
• Codoped Co3O4 with Zn2+ and Ni2+ (1:2 ratio) showed optimal electrocatalytic performance.
• Achieved a current density of 165 mA cm(-2) at 1.75 V, significantly outperforming singly doped samples.
• Attributed superior performance to high active-site density, porosity, and roughness.

Conclusions:

• Synergistic effects of Zn2+ and Ni2+ codoping enhance Co3O4 electrocatalytic properties.
• Zn2+ promotes high oxidation state Co cations, while Ni2+ introduces low activation energy sites.
• Optimized nanostructured Co3O4 holds potential for advanced electrochemical applications.