Interface-driven Pd-Ag-Cu/C nanocomposites with increased oxygen reduction reaction kinetics

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing efficient and stable electrocatalysts is crucial for advancing fuel cell technology.
• Platinum-based catalysts are effective but expensive and scarce.
• Alternative non-precious metal catalysts are needed for widespread adoption.

Purpose of the Study:

• To synthesize and characterize highly dispersed Pd₃Ag₀.₅Cu₀.₅/C nanocomposites.
• To evaluate the electrocatalytic performance of the synthesized nanocomposites for the oxygen reduction reaction (ORR).
• To assess the catalyst's stability and methanol tolerance for fuel cell applications.

Main Methods:

• Solvothermal synthesis method for creating multimetallic nanocomposites.
• Structural characterization using techniques like X-ray diffraction and electron microscopy.
• Electrochemical testing including cyclic voltammetry (CV) and linear sweep voltammetry (LSV).

Main Results:

• Successfully synthesized Pd₃Ag₀.₅Cu₀.₅/C nanocomposites with well-distributed metal domains on a carbon support.
• Demonstrated enhanced ORR kinetics due to interface-driven electronic modulation between Pd, Ag, and Cu.
• Achieved high current density (-5.84 mA cm⁻²), early onset potential (0.94 V vs. RHE), and favorable half-wave potential (0.80 V vs. RHE).

Conclusions:

• The Pd₃Ag₀.₅Cu₀.₅/C nanocomposite exhibits superior ORR performance compared to other catalysts.
• Enhanced activity is attributed to structural integrity, uniform active site dispersion, and strong carbon support interaction.
• The catalyst shows excellent methanol tolerance and durability, indicating its potential as a Pt-free alternative for fuel cells.