期刊
CHEMICAL ENGINEERING JOURNAL
卷 426, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131706
关键词
Pulsed laser ablation; Platinum nanostructures; Multi-walled carbon nanotubes; Oxygen reduction reaction; Alkaline medium; Gas diffusion electrode
资金
- Faculty of Engineering through the McGill Engineering Doctoral Award (MEDA)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Gerald Hatch Faculty Fellowship
- Fonds de recherche du Quebec - Nature et technologies (FRQNT)
Different platinum nanostructures were synthesized through pulsed laser ablation under varying background gas pressures and laser pulse energies, leading to binder-free Pt/MWCNT/SS structures with high electrocatalytic performance. The Pt nanoparticles exhibited different sizes and morphologies depending on the processing conditions, resulting in enhanced oxygen reduction reaction activity compared to commercial Pt/C thin films.
Different platinum nanostructures were synthesized by pulsed laser ablation (PLA) of a pure Pt target, a byproduct-free and solvent-free synthesis technique. The Pt nanostructures were directly deposited on multiwalled carbon nanotubes (MWCNT) pre-grown on a stainless steel (SS) mesh by chemical vapor deposition. Performing PLA at different background gas pressures (10-5 to 10 Torr, argon) and laser pulse energies (20 to 66 mJ pulse-1) led to a range of coating morphologies containing very low Pt loadings (14 to 35 mu g cm-2), from the uniform and dense nanoparticle thin coatings at low pressure to highly porous granular coatings at higher pressure. Increasing the background gas pressure led to an increase in primary Pt nanoparticle size from 2.0 +/- 0.2 nm to 2.8 +/- 0.8 nm. XPS results showed a positive shift in the Pt 4f7/2 binding energies with lowering the PLA pressure and laser energy, which was linked to the formation of smaller Pt nanoparticles. The presence of Pt (111), (200), (220), and (311) was confirmed by SAED patterns in the Pt nanostructures. The electrocatalytic performance of these binder-free Pt/MWCNT/SS structures was evaluated in the oxygen reduction reaction (ORR) in an alkaline medium, in both the rotating disk electrode (RDE) and gas diffusion electrode (GDE) configurations. In the RDE setup, all Pt/MWCNT/SS electrocatalysts were found to yield a higher specific ORR activity than the commercial Pt/C thin film, while in the GDE setup the Pt/MWCNT/SS electrode with the lowest Pt loading and highest surface area yielded the highest ORR specific activity.
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