Nanotip-Induced Electric Field for Hydrogen Catalysis

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The lightning-rod effect, generating local electric fields, is crucial for regulating microenvironments and active site electronic properties.
• Current applications of local electric fields are primarily restricted to plasmonic metals like gold, silver, and copper.

Purpose of the Study:

• To fabricate and investigate Ruthenium-Copper (RuCu) snow-like nanosheets (SNSs) with high-curvature nanotips.
• To enhance the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) through the lightning-rod effect.

Main Methods:

• Fabrication of RuCu snow-like nanosheets (SNSs) with high-curvature nanotips.
• Utilizing theoretical simulations to analyze the local electric field distribution and its effect on active sites.
• Electrocatalytic performance testing for HOR and HER in alkaline media.

Main Results:

• RuCu SNSs induce a strong local electric field at sharp nanotips, promoting the accumulation of OH⁻ for HOR and H⁺ for HER.
• Copper incorporation tunes the binding strength of key intermediates (OH* and H*), optimizing catalytic activity.
• The mass activity for alkaline HOR over RuCu SNSs was 31.3 times higher than RuCu nanocrystals without sharp tips.
• The overpotential for achieving 10 mA cm⁻² during HER with RuCu SNSs was remarkably low at 14.0 mV.

Conclusions:

• RuCu SNSs effectively utilize the lightning-rod effect for enhanced electrocatalysis.
• The designed nanostructure and composition significantly improve HOR and HER performance in alkaline electrolytes.
• This work offers a promising strategy for developing advanced electrocatalysts by manipulating local electric fields.