Self-Etching Pd-Pb Nanoparticles with Controllable Tensile Strain for C₂ Alcohol Oxidation.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Palladium-based nanocatalysts are crucial for alkaline direct ethanol fuel cells (DEFCs).
• Conventional catalysts face challenges with low palladium atom utilization and sluggish reaction kinetics.
• Developing efficient and stable catalysts is essential for advancing fuel cell technology.

Purpose of the Study:

• To synthesize palladium-lead (Pd3Pb1) alloy nanoparticles using a self-etching strategy.
• To enhance the electrocatalytic performance of palladium-based catalysts for the ethanol oxidation reaction (EOR).
• To investigate the effect of tunable size and tensile strain on catalyst activity and stability.

Main Methods:

• A self-etching strategy was employed to synthesize Pd3Pb1 nanoparticles (NPs) with controlled size and tensile strain.
• Electrocatalytic performance for EOR was evaluated using current density measurements.
• Stability was assessed through prolonged cyclic voltammetry (CV) testing.

Main Results:

• The synthesized Pd3Pb1 NPs exhibited significantly enhanced electrocatalytic performance for EOR.
• Pd3Pb1 NPs-1 achieved a current density of 2565 mA mgPd−1.
• Smaller Pd3Pb1 NPs-2, obtained after self-etching, showed a higher current density of 2820 mA mgPd−1 and excellent stability.
• High mass activity was linked to an optimal balance of active intermediates and blocking species.

Conclusions:

• The self-etching strategy effectively produces Pd3Pb1 alloy nanocatalysts with tunable properties.
• These nanocatalysts demonstrate superior performance and stability for EOR in alkaline DEFCs.
• This approach offers a reliable method for preparing monodisperse nanocatalysts with controlled characteristics for fuel cell applications.