A novel method for rapidly functionalizing perovskite oxides

Area of Science:

• Materials Science
• Catalysis
• Electrochemistry

Background:

• Perovskite oxides are crucial for catalysis and energy conversion.
• Exsolution of metallic nanoparticles from perovskite hosts creates advanced metal/oxide heterogeneous catalysts.
• Tuning perovskite catalytic activity is key for improved performance.

Purpose of the Study:

• To develop a rapid method for triggering nanoparticle exsolution in perovskites.
• To tune the electrochemical performance of perovskite catalysts.
• To understand the relationship between exsolution parameters and catalyst properties.

Main Methods:

• Applying pulsed thermal shock (∼50 ms pulse width) and voltage shock (∼40 s).
• Utilizing multiple pulse cycles to control exsolution.
• Analyzing the effect of pulse number on nanoparticle density and distribution.

Main Results:

• Exsolution-based products were prepared on a timescale of seconds.
• Increased pulse numbers initially enhanced particle density by increasing oxygen vacancies.
• Particle density reached a threshold determined by exsolvable metal content.
• Enhanced active sites and conducting paths significantly improved perovskite activity.

Conclusions:

• Rapid exsolution is achievable using pulsed thermal and voltage shocks.
• This method offers precise control over nanoparticle formation and catalyst properties.
• The enhanced perovskite catalysts show significantly improved electrochemical performance.