Hollow Hydrangea-Like CoRu/Co Architecture as an Excellent Electrocatalyst for Oxygen Evolution

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Efficient electrocatalysts are vital for hydrogen production via water splitting.
• The oxygen evolution reaction (OER) kinetics are sluggish, necessitating improved catalysts.
• Low-cost, high-performance materials are sought to replace expensive noble metals.

Purpose of the Study:

• To develop a cost-effective and highly efficient electrocatalyst for the oxygen evolution reaction (OER).
• To investigate a novel hierarchical hollow hydrangea-like CoRu/Co superstructure.
• To understand the structure-activity relationship for enhanced OER performance.

Main Methods:

• A self-templating method involving morphology-controlled pyrolysis of Ru-doped Co-based layered double hydroxides (LDH).
• Synthesis of a hierarchical hollow hydrangea-like CoRu/Co superstructure.
• Electrocatalytic testing in alkaline media to evaluate OER performance and stability.

Main Results:

• The optimized CoRu/Co-M-350 catalyst (3.0 wt% Ru) showed excellent OER activity with a low overpotential (192 mV at 10 mA cm⁻²).
• Exceptional stability was demonstrated, maintaining performance for 100 hours at 100 mA cm⁻².
• The catalyst outperformed benchmark RuO₂ and other reported electrocatalysts.

Conclusions:

• The hierarchical hollow hydrangea-like CoRu/Co superstructure offers abundant active sites and efficient mass/electron transfer.
• This provides a promising new synthetic route for highly active and stable OER electrocatalysts.
• The findings contribute to advancing efficient hydrogen production technologies.