| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 184885 | Electrochimica Acta | 2014 | 7 Pages |
•Compared with Pd-on-Au catalyst, Pt-on-Au catalyst exhibits higher activity for methanol oxidation in alkaline media but lower stability.•After modifying Pd surface with low amount of Pt, the activity for methanol oxidation get improved greatly.•The Pt deposited on Pd shows improved stability in comparison with the Pt deposited on Au substrate.•The total mass activity of Pt-on-Pd/CNTs for methanol oxidation is on a similar level to that of Pt/CNTs.
For optimizing both the activity and stability of Pt-based catalysts for methanol oxidation reaction (MOR), several carbon nanotubes(CNTs)-supported catalysts such as Pt-on-Au/CNTs, Pd-on-Au/CNTs, Pt-on-Pd-on-Au/CNTs, Pt-on-Pd/CNTs, and Pd-on-Pt/CNTs catalysts are synthesized mainly through electrodeposition method. The activity and stability comparisons show that Pt-on-Au/CNTs has a higher MOR activity but a lower stability than Pd-on-Au/CNTs. To utilize the merits of the Pt and Pd components, Pt-on-Pd-on-Au/CNTs and Pt-on-Pd/CNTs catalysts are synthesized. The Pt-on-Pd-on-Au/CNTs and Pt-on-Pd/CNTs catalysts shows higher MOR activity than Pd-on-Au/CNTs and Pd/CNTs catalysts and higher stability than Pt-on-Au/CNTs, suggesting a synergistic interaction between Pt and Pd in catalyzing methanol oxidation reaction. Calculation shows that the total mass activity of Pt-on-Pd/CNTs with quite low Pt amount is on a similar level as that of Pt/CNTs for MOR oxidation, indicating the Pt-on-Pd catalyst could have promising potential as a low-Pt catalyst for MOR in alkaline media.
Graphical abstractBy modifying Pd surface with Pt moieties, both the methanol oxidation activity and cycling stability get evidently improved.Figure optionsDownload full-size imageDownload as PowerPoint slide
