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Tailoring Amorphous PdCu Nanostructures for Efficient C-C Cleavage in Ethanol Electrooxidation.
Weicong Wang1,2, Xiatong Shi1,2, Tianou He1,2
1Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
Nano Letters
|July 20, 2022
Summary
Amorphous palladium-copper (a-PdCu) nanomaterials significantly boost ethanol oxidation reaction (EOR) electrocatalyst efficiency. This breakthrough facilitates C-C bond cleavage, enhancing fuel cell performance and durability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Direct ethanol fuel cells (DEFCs) face challenges due to slow ethanol oxidation reactions (EOR) at the anode.
- Current electrocatalyst designs, primarily crystalline, offer limited improvements in EOR efficiency.
Purpose of the Study:
- To develop superior electrocatalysts for the ethanol oxidation reaction (EOR) in direct ethanol fuel cells.
- To investigate the impact of amorphous structures on EOR catalytic activity and durability.
Main Methods:
- Fabrication of amorphous Palladium-Copper (a-PdCu) nanomaterials.
- Kinetic control for tailoring nanocatalyst size and shape.
- Electrochemical testing, including accelerated durability tests.
Main Results:
- Amorphous PdCu (a-PdCu) nanomaterials demonstrate significantly enhanced EOR catalytic activity.
- Facilitated C-C bond cleavage leads to a high C1 pathway faradaic efficiency (69.6%).
- Optimized a-PdCu nanocatalysts achieve a maximum mass activity of 15.25 A/mgPd, surpassing existing catalysts.
Conclusions:
- Amorphization of PdCu catalysts substantially improves EOR efficiency and durability.
- Isotropic structure and 1D shape of nanocatalysts enhance catalytic stability.
- This study offers a new strategy for designing advanced amorphous noble metal electrocatalysts for fuel cells.
