Sn-doped PdCu alloy nanosheet assemblies as an efficient electrocatalyst for formic acid oxidation

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Direct formic acid fuel cells (DFAFCs) require efficient anode catalysts.
• Palladium (Pd)-based catalysts are effective but costly.
• Ternary alloys can improve Pd's electronic structure and reduce precious metal usage.

Purpose of the Study:

• To synthesize and characterize a novel ternary alloy catalyst, PdCuSn Ns/C, with a unique 3D structure.
• To evaluate the electrocatalytic performance of PdCuSn Ns/C for the formic acid oxidation reaction (FAOR).
• To investigate the role of Cu and Sn incorporation and the 3D nanosheet structure in enhancing catalytic activity and stability.

Main Methods:

• A simple two-step wet chemical method was employed for catalyst synthesis.
• Electrochemical techniques were used to assess catalytic activity and stability for FAOR.
• Characterization focused on the unique 3D nanosheet structure and elemental composition.

Main Results:

• The synthesized PdCuSn Ns/C catalyst demonstrated excellent activity and stability for FAOR.
• Mass activity was 2420.1 mA mg^-1_Pd, which is 3.94 times higher than that of Pd/C.
• The improved performance is attributed to altered Pd electronic structure, increased active sites, and enhanced mass transfer due to Cu, Sn, and the 3D structure.

Conclusions:

• The PdCuSn Ns/C catalyst offers a promising, cost-effective alternative for DFAFC anode catalysis.
• The unique 3D nanosheet structure and ternary alloy composition significantly boost electrocatalytic performance.
• This catalyst shows potential for reducing precious metal content while enhancing fuel cell efficiency.