Constructing AgO/Ag₂O Electrocatalysts with Highly Exposed and Tightly Contacted Active Facets for Efficient Oxygen...

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Efficient electrocatalysts are vital for sustainable hydrogen production via water electrolysis.
• Understanding the oxygen evolution reaction (OER) mechanism is key to improving efficiency.

Purpose of the Study:

• To synthesize and characterize silver-based electrocatalysts for OER.
• To investigate the relationship between catalyst structure and OER performance.
• To elucidate the mechanism behind the enhanced catalytic activity.

Main Methods:

• Electrochemical anodic oxidation using metallic silver wire under varying DC voltages (Ag-x).
• Characterization of the resulting AgO/Ag2O composite surfaces.
• Evaluation of OER performance, including overpotential and stability.
• Analysis of electrochemical active surface area (ECSA) and surface species.

Main Results:

• AgO/Ag2O composite layers formed on silver electrodes.
• The Ag-10 electrode exhibited the lowest overpotential (399 mV at 50 mA cm⁻²).
• Superior OER performance linked to AgO (-111) and Ag2O (111) crystal phase interface, Ag-O-O-Ag species, and larger ECSA.

Conclusions:

• The Ag-10 electrode shows promising potential as an efficient OER electrocatalyst.
• The study provides insights into synthesizing metal oxide electrocatalysts and understanding their mechanisms.
• Optimized silver oxide composites can significantly enhance water electrolysis efficiency.