Support Engineering Strategy to Tackle the Trade-Off Between Catalytic Reactivity and H₂O₂ Selectivity in...

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Direct electrochemical reduction of oxygen to hydrogen peroxide is a promising alternative to traditional methods.
• Existing noble metal electrocatalysts (e.g., Pd, Pt) often exhibit limited reactivity and selectivity for hydrogen peroxide production.

Purpose of the Study:

• To develop a highly reactive and selective electrocatalyst for oxygen reduction to hydrogen peroxide.
• To investigate the effect of a nitrogen- and sulfur- co-functionalized carbon support on catalyst performance.

Main Methods:

• Synthesis of ultrafine (approx. 1 nm) palladium nanoparticles stabilized on a nitrogen- and sulfur- co-functionalized carbon support (Pd/NSC).
• Electrochemical evaluation of the Pd/NSC catalyst for oxygen reduction reactions.

Main Results:

• The Pd/NSC catalyst demonstrated excellent reactivity for the electro-oxygen reduction reaction.
• High selectivity towards hydrogen peroxide production was achieved with the Pd/NSC catalyst.
• The N and S co-functionalization of the carbon support was crucial for enhancing performance.

Conclusions:

• Ultrafine Pd nanoparticles on a N and S co-functionalized carbon support offer a promising strategy for efficient electro-hydrogen peroxide synthesis.
• This support engineering approach can simultaneously improve reactivity and selectivity in electro-oxygen reduction.