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Joo, Sang Hoon
Nanomaterials & Catalysis Lab
Research Interests
  • Catalyst, energy conversion, fuel cells, electrolyzer, ORR, HER, OER

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Spectroscopic Study of the Thermal Degradation of PVP-Capped Rh and Pt Nanoparticles in H-2 and O-2 Environments

Cited 22 times inthomson ciCited 22 times inthomson ci
Title
Spectroscopic Study of the Thermal Degradation of PVP-Capped Rh and Pt Nanoparticles in H-2 and O-2 Environments
Author
Borodko, YuriLee, Hyun SookJoo, Sang HoonZhang, YawenSomorjai, Gabor
Keywords
Absorption band; Accessible surface areas; Amide groups; Coordination compounds; DRIFT spectroscopy; FTIR; In-situ FT-IR; N vinylpyrrolidone; Pt atoms; Pt nanoparticles; Pyrrolidones; Rhodium nanoparticles; Spectroscopic studies; Thermal decays; Thermal degradations; Thin layers
Issue Date
201001
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.114, no.2, pp.1117 - 1126
Abstract
Poly(N-vinylpyrrolidone (PVP)-capped platinum and rhodium nanoparticles (7-12 nm) have been Studied with UV-vis, FTIR, and Raman spectroscopy. The absorption bands in the region of 190-900 nm are shown to be sensitive to the electronic structure of surface Rh and Pt atoms as well as to the aggregation of the nanoparticles. In-situ FTIR-DRIFT spectroscopy of the thermal decay of PVP-stabilized Rh and Pt nanoparticles in H-2 and O-2 atmospheres in temperatures ranging from 30 to 350 degrees C reveals the decomposition of PVP above 200 degrees C; PVP transforms into a "polyamide-polyene"-like material that is, in turn, converted into a thin layer of amorphous carbon above 300 degrees C. Adsorbed carbon monoxide was used as a probing molecule to monitor changes of the electronic structure of surface Rh and Pt atoms and accessible surface area. The behavior of surface Rh and Pt atoms with ligated CO and amide groups of pyrrolidones resembles that of surface coordination compounds.
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DOI
http://dx.doi.org/10.1021/jp909008z
ISSN
1932-7447
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