CoFe-Layered Double Hydroxide Coupled with Pd Particles for Electrocatalytic Ethanol Oxidation

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Ethanol oxidation reaction (EOR) is crucial for direct ethanol fuel cells.
• Electrocatalytic efficiency and stability are key challenges for EOR.
• Developing advanced electrocatalysts is essential for improving fuel cell performance.

Purpose of the Study:

• To synthesize and characterize a novel electrocatalyst, Pd/Co1Fe3-LDH/NF, for the ethanol oxidation reaction (EOR).
• To investigate the structural and electronic properties of the electrocatalyst and their influence on EOR performance.
• To compare the electrocatalytic activity and stability of the new catalyst with commercial alternatives.

Main Methods:

• A two-step synthetic strategy was employed to prepare the Pd/Co1Fe3-LDH/NF electrocatalyst.
• Electrochemical techniques were used to evaluate the catalytic performance for EOR.
• Structural and electronic properties were analyzed to understand the mechanism.

Main Results:

• The Pd/Co1Fe3-LDH/NF electrocatalyst exhibited significantly higher specific activity (17.46 mA cm-2) compared to commercial Pd/C and Pt/C.
• The catalyst demonstrated enhanced structural stability due to metal-oxygen bonds and improved active site exposure.
• The electronic structure modulation via Pd-O-Co(Fe) bridge facilitated OH- absorption and COads oxidation, improving resistance to catalyst poisoning (jf/jr ratio of 1.92).

Conclusions:

• The Pd/Co1Fe3-LDH/NF electrocatalyst offers superior performance for EOR due to synergistic interfacial interactions and optimized electronic structure.
• This work provides valuable insights into designing high-performance electrocatalysts by tuning metal-support electronic interactions for fuel cell applications.
• The developed catalyst shows great promise for advancing direct ethanol fuel cell technology.