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Kinetically Manipulating the Nucleus Attachment to Create Atypical Defective Rh-Pt Alloyed Nanostructures as Active
Kai Liu1, Zixi Lyu1, Xuejiao Chen1
1College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, China.
Chemistry, an Asian Journal
|August 25, 2020
Summary
Controlling reaction kinetics allows for the synthesis of defective metal nanocrystals like Rh-Pt wavy nanowires. These structures exhibit enhanced catalytic activity and durability for ethanol oxidation electrocatalysis.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Defective metal nanostructures show significant catalytic properties due to defect sites.
- Atypical nanocrystals with grain boundaries (GBs) and twin boundaries (TBs) are of interest.
- Understanding their growth mechanisms and synthetic control remains limited.
Purpose of the Study:
- To demonstrate control over metal nucleation and nucleus attachment through reaction kinetics.
- To synthesize atypical nanocrystals with tunable morphology and defect density.
- To investigate the catalytic performance of these engineered nanostructures.
Main Methods:
- Utilized Rh-Pt nanoalloy as a model system.
- Systematically controlled reaction kinetics to manipulate nucleation and attachment.
- Characterized resulting nanocrystal morphologies: nanoparticles (NPs), wavy nanowires (WNWs), and spliced nanocubes (SNCs).
Main Results:
- Achieved synthesis of diverse atypical nanocrystals by controlling reaction kinetics.
- Rh47Pt53 WNWs, rich in TBs and GBs, demonstrated superior mass activity (0.655 A·mg−1Pt) and durability.
- Performance of WNWs was 2.9 times higher than commercial Pt/C for ethanol oxidation.
Conclusions:
- Reaction kinetics are crucial for regulating nucleus attachment and nanocrystal morphology.
- Rational control over nanocrystal structure and defects is achievable.
- Engineered defective nanostructures offer enhanced electrocatalytic performance.
