Grain boundary-engineered porous CuO/Co₃O₄ heterostructure as a pre-catalyst for enhanced oxygen evolution

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Oxygen evolution reaction (OER) is crucial for energy conversion.
• Developing efficient and stable electrocatalysts for OER remains a challenge.
• Heterostructures offer unique properties for catalytic applications.

Purpose of the Study:

• To fabricate a grain-boundary-engineered porous CuO/Co3O4 heterostructure.
• To investigate its performance as a dynamic pre-catalyst for oxygen evolution.
• To understand the role of grain boundaries and nanopores in catalytic activity.

Main Methods:

• Synthesis of CuO/Co3O4 heterostructure with controlled grain boundaries and nanopores.
• Electrochemical characterization of the material for oxygen evolution reaction.
• In-situ/operando techniques to study pre-oxidation and high-valence species activation.

Main Results:

• The engineered heterostructure demonstrated robust oxygen evolution activity.
• Tailored grain boundaries and nanopores were found to facilitate pre-oxidation.
• Activation of high-valence species was confirmed, leading to enhanced catalytic performance.

Conclusions:

• Grain-boundary engineering and pore structure are effective strategies to create dynamic pre-catalysts.
• The CuO/Co3O4 heterostructure shows significant potential for efficient oxygen evolution.
• This work provides insights into catalyst design for advanced energy applications.