Metal Atoms and Quantum Dots Coexist for Water Electrolysis.

Area of Science:

• Materials Science
• Catalysis
• Electrochemistry

Background:

• Controlling metal atom synthesis on supports is crucial for advanced catalysis.
• Precisely synthesizing well-defined metal atom systems with controlled valence states remains challenging.
• Graphene quantum dots (GDY) offer unique electronic properties for catalyst design.

Purpose of the Study:

• To develop a new catalytic system with coexisting metal atoms and quantum dots.
• To investigate the long-range electronic control of catalytic activity.
• To achieve high efficiency in the alkaline hydrogen evolution reaction (HER).

Main Methods:

• Theoretical predictions guided the synthesis of the catalyst.
• Precise structural studies characterized the distribution of Ni atoms and RuNix quantum dots on GDY.
• Electrochemical measurements evaluated the catalyst's performance in HER.

Main Results:

• A novel Ni-RuNix/GDY catalyst was successfully synthesized with Ni atoms and RuNix quantum dots on GDY.
• GDY facilitated long-range electronic control, enhancing the interaction between Ni atoms and the sp-C support.
• The catalyst demonstrated exceptional HER performance with low overpotentials (17 mV at 10 mA cm⁻², 116 mV at 1000 mA cm⁻²).

Conclusions:

• This work presents a new strategy for creating highly efficient multi-component atom catalysts.
• A novel concept of long-range electronic control in catalysis was demonstrated.
• The findings open new avenues for designing advanced catalytic systems for energy applications.