Promoting Surface Reconstruction with a Tip-Enhanced Local Field and Electronic Interaction for Efficient Oxygen...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Optimizing transition-metal electrocatalysts for the oxygen evolution reaction (OER) requires precise control over surface reconstruction.
• Developing effective strategies for tuning surface reconstruction remains a significant challenge in catalysis research.

Purpose of the Study:

• To develop a synergistic strategy using electronic interactions and tip-enhanced local fields to tune surface reconstruction in electrocatalysts.
• To demonstrate this strategy through the construction of a novel heterostructure catalyst for the oxygen evolution reaction.

Main Methods:

• Fabrication of a heterostructure catalyst: FeCo2S4 hollow nanoneedle decorated with MoO3 nanoparticles (MoO3@FeCo2S4).
• Utilized theoretical calculations and in situ X-ray absorption spectroscopy to investigate surface reconstruction mechanisms.
• Evaluated the electrocatalytic performance for the oxygen evolution reaction in alkaline media.

Main Results:

• The MoO3@FeCo2S4 catalyst exhibited synergistic effects from electronic interactions and local field enhancement.
• Surface reconstruction led to the formation of active Co(Fe)OOH-MoO3 species, facilitated by Co-O-Mo motifs.
• Achieved a low overpotential of 277 mV at 100 mA cm-2 and stable operation at 200 mA cm-2 for 100 hours.

Conclusions:

• The study presents an effective method for rational regulation of surface reconstruction in transition-metal electrocatalysts.
• Integration of electronic effects and local environmental control is crucial for designing advanced OER catalysts.
• The developed MoO3@FeCo2S4 catalyst shows promising potential for efficient and stable oxygen evolution.