SnO₂@PdAg Core-Shell Nanoarchitecture Promotes Active and Stable Alcohol Electrooxidations

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Efficient electrocatalysts are crucial for direct alcohol fuel cells (DAFCs).
• Palladium (Pd)-based nanomaterials are promising but require performance enhancement.
• Core-shell architectures offer a strategy to improve catalyst kinetics and stability.

Purpose of the Study:

• To develop an efficient Pd-based electrocatalyst with a core-shell structure.
• To investigate the catalytic activity and stability of PdAg alloy shells on non-noble metal oxide cores.
• To understand the role of the heterointerface in enhancing electrocatalytic performance.

Main Methods:

• Synthesis of PdAg alloy nanoparticles on a SnO2 core.
• Fabrication of SnO2@PdAg core-shell nanostructures.
• Electrochemical characterization of methanol and ethylene glycol oxidation reactions.

Main Results:

• The optimized SnO2@PdAg core-shell nanospheres exhibited superior catalytic performance compared to other materials and commercial Pd/C.
• The PdAg/SnO2 heterointerface effectively modulated the electronic structure of Pd, enhancing activity.
• Strong interaction between the PdAg shell and SnO2 core improved catalyst stability by suppressing dissolution.

Conclusions:

• Rational design of core-shell nanoarchitectures using non-noble metal oxides as cores is an effective strategy for DAFCs.
• SnO2@PdAg core-shell nanostructures show great potential as highly active and stable electrocatalysts.
• This approach offers a pathway to suppress catalyst dissolution and improve durability.