PdAg Nanoparticles with Different Sizes: Facile One-Step Synthesis and High Electrocatalytic Activity for Formic Acid...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Direct formic acid fuel cells (DFAFCs) offer advantages like low operating temperature and high energy density.
• Formic acid oxidation (FAO) is crucial for DFAFC performance.
• Controlling nanoparticle size is key to optimizing electrocatalytic activity.

Purpose of the Study:

• To synthesize bimetallic Palladium-Silver nanoparticles (PdAg NPs) with controlled sizes.
• To investigate the electrocatalytic performance of these PdAg NPs for formic acid oxidation.
• To evaluate the effect of particle size and carbon support on catalytic activity and stability.

Main Methods:

• One-pot solvothermal co-reduction synthesis of PdAg NPs.
• Size control of PdAg NPs by adjusting precursor concentration.
• Incorporation of PdAg NPs onto carbon support (PdAg/C).
• Electrochemical characterization of catalytic performance for FAO.

Main Results:

• Successfully synthesized PdAg NPs with controllable sizes (3.7 nm PdAg-S and 9.5 nm PdAg-L).
• PdAg-S/C exhibited significantly higher mass activity (1.6x PdAg-L/C, 2x commercial Pd/C).
• Enhanced activity attributed to larger electrochemical surface area (ECSA) and optimized intermediate adsorption for smaller nanoparticles.

Conclusions:

• Bimetallic PdAg NPs synthesized via solvothermal co-reduction offer tunable sizes for enhanced electrocatalysis.
• Smaller PdAg NPs supported on carbon show superior performance in DFAFCs due to synergistic effects.
• This study highlights the potential of size-controlled PdAg NPs for efficient formic acid oxidation.