Constructing heterogeneous interface between Co₃O₄ and RuO₂ with enhanced electronic regulation for efficient oxygen...

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Effective catalysts are crucial for advancing hydrogen energy technology.
• Water splitting requires efficient oxygen evolution reaction (OER) catalysts.
• Developing catalysts for large current densities remains a challenge.

Purpose of the Study:

• To construct a Co3O4/RuO2 heterojunction catalyst.
• To investigate its performance in the oxygen evolution reaction (OER).
• To understand the mechanism behind its enhanced catalytic activity.

Main Methods:

• Ion exchange reaction and pyrolysis were used to synthesize the catalyst.
• Electrochemical testing was performed to evaluate OER activity and stability.
• Experimental results were complemented by theoretical calculations.

Main Results:

• The Co3O4/RuO2-4 catalyst demonstrated outstanding OER activity at 100 mA cm-2 with a low overpotential of 276 mV.
• The catalyst exhibited remarkable stability, maintaining activity for 60 hours at 100 mA cm-2.
• Electron transfer from RuO2 to Co3O4 at the interface optimized energy barriers for OER intermediates.

Conclusions:

• The Co3O4/RuO2 heterojunction is a highly efficient electrocatalyst for the oxygen evolution reaction.
• Electron redistribution at the interface enhances catalytic performance.
• This composite catalyst design offers a promising strategy for efficient electrocatalysts at high current densities.