Electro-assisted Molecular Assembly Giving Atomic-Scale Catalytic Active-Site Detection.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Designing nonmetal electrocatalysts with precisely controlled active sites is challenging due to difficulties in synthesizing pure active species.
• Complex catalyst structures with multiple configurations hinder the identification of active sites and understanding of reaction mechanisms.

Purpose of the Study:

• To develop a novel strategy for the controlled synthesis of nonmetal electrocatalyst active sites.
• To identify the specific active atom and elucidate the reaction mechanism in carbon-defect electrocatalysis.

Main Methods:

• An electro-assisted molecular assembly strategy was employed to create a pure pentagon ring structure on graphene.
• A subtle passivation process was utilized to confirm the active atom.

Main Results:

• A pure pentagon ring structure on graphene was successfully synthesized, avoiding other reconstructed structures.
• The topmost carbon atom on the graphene was identified as the active site for electrocatalysis.
• The carbon-defect electrocatalysis reaction mechanism was elucidated at the single-atom scale.

Conclusions:

• The developed electro-assisted molecular assembly strategy enables precise control over nonmetal electrocatalyst active sites.
• This method facilitates the identification of the exact active atom and understanding of reaction mechanisms.
• The strategy holds potential for broad applications in synthesizing structure-controlled nonmetal electrocatalysts.