Mechanistic Insights into Proximity Effect-Mediated Oxygen Reduction Reaction Performance Regulation by Platinum...

Area of Science:

• Electrochemistry
• Materials Science

Background:

• Fuel cells offer promising energy conversion but face challenges in catalyst activity, selectivity, and stability for the oxygen reduction reaction (ORR).
• Platinum (Pt)-based catalysts are efficient for ORR but are limited by Pt's high cost and scarcity.
• The impact of platinum nanoparticle proximity on ORR performance is underexplored, despite known effects of morphology and size.

Purpose of the Study:

• To provide a comprehensive insight into how the proximity effect of platinum nanoparticles influences ORR activity, selectivity, and stability.
• To offer theoretical guidance for designing more efficient ORR catalysts.
• To explore challenges and solutions related to the proximity effect in supported catalysts.

Main Methods:

• Review and synthesis of experimental and theoretical results concerning the ORR mechanism on Pt-based catalysts.
• Analysis of how platinum nanoparticle proximity affects oxygen reduction reaction pathways.
• Investigation of platinum nanoparticle degradation mechanisms in relation to proximity.

Main Results:

• The proximity of platinum nanoparticles significantly impacts ORR pathways and catalyst degradation.
• Understanding and controlling nanoparticle proximity is crucial for optimizing ORR performance.
• Specific mechanisms linking proximity to activity, selectivity, and stability were revisited.

Conclusions:

• Regulating the proximity effect of platinum nanoparticles is pivotal for enhancing the electrocatalytic performance of supported catalysts.
• This understanding can guide the development of cost-effective and high-performance fuel cell catalysts.
• Further research into proximity effects can accelerate the commercialization of fuel cell technology.