Nanostructured RuO₂-Co₃O₄@RuCo-EO with low Ru loading as a high-efficiency electrochemical oxygen evolution catalyst

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Electrochemical water splitting is key for converting renewable energy into hydrogen.
• Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is critical.

Purpose of the Study:

• To design and synthesize a nanostructured RuO2/Co3O4-RuCo-EO electrode.
• To evaluate its electrocatalytic performance for the oxygen evolution reaction (OER) in an alkaline medium.

Main Methods:

• Magnetron sputtering combined with electrochemical oxidation.
• Electrocatalytic performance testing including overpotential and Tafel slope measurements.

Main Results:

• The optimized RuO2/Co3O4-RuCo-EO electrode showed a low overpotential of 220 mV at 10 mA cm-2 and a Tafel slope of 59.9 mV dec-1.
• Significant reductions in overpotential were observed compared to conventionally prepared RuO2 and RuO2/Ru core-shell structures.
• The electrode exhibited excellent OER activity.

Conclusions:

• The nanostructured RuO2/Co3O4-RuCo-EO electrode demonstrates high efficiency for the oxygen evolution reaction.
• The core-shell structure facilitates electron transport, and cobalt addition optimizes the electronic structure of ruthenium, leading to enhanced catalytic activity.