MoO2-CoO coupled with a macroporous carbon hybrid electrocatalyst for highly efficient oxygen evolution

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Cost-effective electrocatalysts are essential for efficient energy conversion and storage.
• Oxygen evolution reactions (OER) are critical in various energy applications.

Purpose of the Study:

• To develop a high-performance, cost-effective electrocatalyst for oxygen evolution reactions.
• To investigate the synergistic effects of a composite material for enhanced OER activity.

Main Methods:

• A template method was employed to synthesize a 3D ordered microporous carbon (3DOM) structure.
• The structure was modified with a MoO2 skeleton and cobalt oxide (CoO) nanoparticles, creating the MoO2-CoO-Carbon hybrid.
• Electrocatalytic performance was evaluated for OER.

Main Results:

• The MoO2-CoO-Carbon hybrid exhibited a unique 3DOM structure with a large surface area and stabilized anchoring sites.
• The catalyst demonstrated superior OER properties due to synergistic effects between MoO2 and CoO, and enhanced electron transport from the carbon skeleton.
• The M200-C-Carbon hybrid achieved an overpotential as low as 0.24 V, outperforming many Mo-based OER catalysts.
• Its turnover frequency at 0.35 V was six times higher than commercial RuO2.

Conclusions:

• The developed MoO2-CoO-Carbon electrocatalyst shows exceptional performance for oxygen evolution reactions.
• The 3DOM structure and synergistic composition contribute to its high efficiency and stability, making it a promising candidate for energy applications.