Co₃ O₄ Supported on β-Mo₂ C with Different Interfaces for Electrocatalytic Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Interface engineering is a key strategy to enhance catalyst activity for the electrocatalytic oxygen evolution reaction (OER).
• Developing efficient electrocatalysts is crucial for energy conversion technologies.
• Cobalt oxide (Co3O4) and molybdenum carbide (β-Mo2C) are promising materials for OER.

Purpose of the Study:

• To investigate the effect of interface engineering on the electrocatalytic OER performance of Co3O4 supported on β-Mo2C.
• To explore the relationship between interfacial properties and catalytic activity.
• To demonstrate a strategy for optimizing OER catalysts through interface design.

Main Methods:

• Synthesis of Co3O4 supported on β-Mo2C with varying interfaces.
• Characterization of composite materials using various techniques (e.g., microscopy, spectroscopy) to analyze composition and microstructure.
• Electrocatalytic testing for oxygen evolution reaction (OER) performance evaluation.

Main Results:

• Diverse β-Mo2C morphologies led to varied Co3O4-Mo2C interactions.
• A compact interface formed between Co3O4 nanoparticles and β-Mo2C nanobelts due to opposing surface potentials.
• The engineered interface enhanced conductivity, regulated interfacial electron redistribution, and promoted charge transfer, improving OER activity and surface hydrophilicity.

Conclusions:

• The compact interface between Co3O4 and β-Mo2C significantly boosts electrocatalytic OER performance.
• Interface engineering is an effective approach to optimize catalyst conductivity, charge transfer, and hydrophilicity for improved OER.
• This study provides a successful example of interface engineering for advanced electrocatalytic oxygen evolution.