Real-Time Kinetic Control in the Electrosynthesis of Au₁₀Ag₄ Nanoclusters Via Electrical Signal Modulation

Area of Science:

• Nanomaterials Science
• Electrochemistry
• Chemical Engineering

Background:

• Conventional nanocluster (NC) synthesis relies on thermodynamic equilibrium, limiting kinetic control.
• On-demand manipulation of NC formation kinetics is challenging with current bulk solution methods.

Purpose of the Study:

• To report the first electrosynthesis of a bimetallic nanocluster with atomic precision.
• To demonstrate real-time kinetic control in NC synthesis using electrical signal modulations.

Main Methods:

• Electrosynthesis using pulsed potential.
• Modulation of electrical signals (potential, pulse duration, off-time) to control reaction kinetics.
• Characterization of bimetallic nanoclusters synthesized with atomic precision.

Main Results:

• Pulsed potential offers superior suppression of cathodic deposition compared to constant potential.
• Reaction kinetics show a volcano-shaped dependency on pulse duration, peaking at approximately 10 seconds.
• Synthesis reactions can be switched on/off instantaneously and reaction rates precisely tuned via electrical signal adjustments.

Conclusions:

• Electrical signal modulation provides a viable strategy for real-time reaction control in nanocluster synthesis.
• This approach enables programmable and controllable synthesis of metal nanoclusters with atomic precision.
• Electrosynthesis opens new avenues for kinetically controlled nanomaterial fabrication.