Infrared Reflection Absorption Spectroscopy of the Sulfuric Acid Anion on Low and High Index Planes of Palladium

Autor:	Yoshio Hori, Makiko Kuroda, and Osamu Koga, Nagahiro Hoshi
Rok vydání:	2002
Předmět:	Absorption spectroscopy Infrared Analytical chemistry chemistry.chemical_element Sulfuric acid Surfaces Coatings and Films Ion chemistry.chemical_compound Adsorption Reflection (mathematics) chemistry Electrode Materials Chemistry Physical and Theoretical Chemistry Palladium
Zdroj:	The Journal of Physical Chemistry B. 106:9107-9113
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp020898+
Popis:	The sulfuric acid anion (HSO4- or SO42-) adsorbed on Pd single-crystal electrodes was studied using infrared reflection absorption spectroscopy (IRAS) in 0.05 M H2SO4 solution. Surfaces examined are flat ones (Pd(111) and Pd(100)) and stepped ones (Pd(110) (= 2(111)−(111)) and Pd(311) (= 2(111)−(100))). All of the surfaces give a single IRAS band around 1200 cm-1 that is assigned to S−O stretching vibration. The integrated band intensity depends on the crystal orientation significantly, i.e., Pd(311) ∼ Pd(110) ≪ Pd(100) < Pd(111), showing that the flat surfaces adsorb more sulfuric acid anion than the stepped ones. Magnitude of the band shift (dν/dE) on the flat surfaces is nearly twice as high as that on the stepped ones.
Databáze:	OpenAIRE
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