Multifunctional nanostructured electrocatalysts for energy conversion and storage: current status and perspectives

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Electrocatalytic oxygen reduction (ORR), oxygen evolution (OER), and hydrogen evolution (HER) reactions are vital for energy devices like fuel cells and batteries.
• Current limitations include sluggish reaction kinetics and reliance on expensive noble metal catalysts, hindering commercialization.
• There is a significant need for efficient, robust, and cost-effective bifunctional or trifunctional electrocatalysts.

Purpose of the Study:

• To review recent developments in nanostructured bifunctional and trifunctional electrocatalysts.
• To highlight catalysts with improved performance for rechargeable metal-air batteries and fuel cells.
• To summarize reaction mechanisms and the role of electronic structure in alkaline media.

Main Methods:

• Review of recent literature on nanostructured electrocatalysts for ORR, OER, and HER.
• Analysis of catalyst performance in rechargeable metal-air batteries and fuel cells.
• Discussion of electronic structure and surface redox chemistry influencing catalytic activity.

Main Results:

• Recent advances in bifunctional and trifunctional nanostructured catalysts show promise for enhanced ORR, OER, and HER performance.
• Nanocatalyst electronic structure and surface redox chemistry are key factors in improving catalytic efficiency in alkaline media.
• Improved catalyst designs are emerging for applications in fuel cells and metal-air batteries.

Conclusions:

• Nanostructured bifunctional/trifunctional electrocatalysts offer a viable path to overcome the limitations of noble metal catalysts.
• Understanding catalyst electronic structure and redox chemistry is essential for designing next-generation electrocatalysts.
• Continued research in this area is critical for the commercialization of advanced renewable energy technologies.