Self-Inhibition Phenomena in Cu₃Pt Oxidation by CO₂

Area of Science:

• Surface Science
• Catalysis
• Materials Science

Background:

• Copper-platinum alloys are promising catalysts for CO2 utilization.
• Understanding CO2 interaction with alloy surfaces is crucial for catalyst design.

Purpose of the Study:

• To investigate the oxidation behavior of Cu3Pt(100) in CO2 atmosphere.
• To elucidate the reaction mechanisms of CO2 dissociation and surface redox reactions.

Main Methods:

• In situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS)
• Mass spectroscopy
• Density functional theory (DFT) modeling

Main Results:

• Observed simultaneous oxidation and reduction of Cu2O due to CO2 dissociation.
• Identified a dynamic equilibrium state driven by atomic oxygen and CO.
• DFT revealed inhibitory effects of subsurface Pt and counteracting roles of CO2/CO.

Conclusions:

• CO2 dissociative pathway and dynamic surface evolution are key to Cu-based catalyst performance.
• Surface composition and gas reactant manipulation can tune catalytic activity.
• Mechanistic insights advance the design of catalysts for CO2 conversion.