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PtPdCu nanodendrites enable complete ethanol oxidation by enhancing CC bond cleavage
Fei Wang1, Kaili Wang1, Chao An1
1Tianjin Key Laboratory of Advanced Functional Porous Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China.
Journal of Colloid and Interface Science
|March 21, 2020
Summary
Ternary platinum-palladium-copper (PtPdCu) nanodendrites significantly boost ethanol oxidation in direct ethanol fuel cells (DEFCs). These nanodendrites offer enhanced activity and CO anti-poisoning, improving fuel cell performance.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Complete ethanol oxidation is crucial for direct ethanol fuel cells (DEFCs) due to high energy conversion efficiency.
- Challenges include slow carbon-carbon bond cleavage kinetics and susceptibility to carbon monoxide (CO) poisoning.
- Developing efficient electrocatalysts is essential for advancing DEFC technology.
Purpose of the Study:
- To synthesize and investigate ternary platinum-palladium-copper (PtPdCu) nanocrystals for complete ethanol oxidation.
- To evaluate the electrocatalytic performance of these ternary nanocrystals for the ethanol oxidation reaction (EOR).
- To understand the role of structural and synergistic effects in enhancing catalytic activity and durability.
Main Methods:
- Synthesis of ternary PtPdCu nanodendrites (NDs) with stepped surfaces.
- Electrochemical characterization including cyclic voltammetry and chronoamperometry.
- Evaluation of mass activity, specific activity, and CO anti-poisoning capabilities.
- Analysis of carbon-carbon bond cleavage and C1 pathway selectivity.
Main Results:
- Ternary PtPdCu NDs possess abundant active sites due to their stepped surface structure.
- Achieved mass activity (5.59 A mgPtPd-1) and specific activity (15.82 mA cm-2) are significantly higher than commercial Pt/C.
- Demonstrated superior CO anti-poisoning resistance and enhanced C-C bond cleavage.
- Improved selectivity towards the C1 pathway for ethanol oxidation.
Conclusions:
- Ternary PtPdCu NDs are highly effective electrocatalysts for complete ethanol oxidation in DEFCs.
- The nanostructure and synergistic effects of Pt, Pd, and Cu contribute to enhanced activity and durability.
- These findings pave the way for developing advanced catalysts for efficient and stable fuel cell operation.
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