Journal
NANO ENERGY
Volume 60, Issue -, Pages 111-118Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2019.03.033
Keywords
Platinum; Molecular layer deposition; X-ray adsorption spectrum; Fuel cells; Oxygen reduction reaction
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chair (CRC) Program
- Canada Foundation for Innovation (CFI)
- University of Western Ontario
Ask authors/readers for more resources
Pt-based catalysts are widely applied in fuel cells as key components of both anode and cathode. However, commercial Pt/C catalysts with Pt nanoparticles dispersed on carbon support exhibit poor durability due to the Ostwald ripening effect, detachment and agglomeration of Pt nanoparticles during fuel cell operation. Herein, we demonstrate for the first time the application of molecular layer deposition (MLD) to stabilize Pt catalysts. By atomic layer deposition (ALD) of Pt particles on MLD-derived interlayer, the Pt catalysts show significantly enhanced oxygen reduction reaction (ORR) activity and durability compared to that without the MLD interlayer. The MLD-derived surfaces with enriched pores are helpful for anchoring the Pt nanoparticles and to avoid agglomeration or detachment from the surface sites. In addition, X-ray adsorption spectroscopy (XAS) results show that the deposition of Pt on the MLD-derived interlayer caused the electron transfer from Pt to substrates, which results in a decrease in the number of electrons in the d orbital of Pt. In addition, the extended X-ray absorption fine structure (EXAFS) result indicates that Pt-Pt bond distance is shortened by the deposition on the MLD-derived NCNT, which leads to the enhanced activity of Pt catalysts. This work provided a novel route for stabilizing Pt catalysts through MLD technique.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available