Surface-enhanced infrared absorption spectroscopic studies of adsorbed nitrate, nitric oxide, and related compounds 2: Nitrate ion adsorption at a platinum electrode

Kou Nakata, Yota Kayama, Katsuaki Shimazu, Akira Yamakata, Shen Ye, Masatoshi Osawa

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The adsorbed species formed from the nitrate ion were examined using surface-enhanced infrared absorption spectroscopy (SEIRAS). The main band was observed at 1547-1568 cm-1 at 0.2 V in 0.01 M NaNO3 + 0.1 M HClO4. Although this band is close to that assigned to the adsorbed NO in the literature, it is assigned to the N=O stretching vibration of the chelating bidentate form of nitrate for the following reasons, (i) Nitrate gives a single band, while NO has three bands independent of the coverage, (ii) The band intensity remained constant in the potential range from 0.1 to 0.6 V, while that of the bridged NO at around 1600 cm-1 decreased in this range, (iii) The rate constants for the reduction and/or desorption at negative potentials are about 3 times higher than those of the bridged NO. (iv) The adsorbed species from nitrate is replaced with CO more easily than the bridged NO.

Original languageEnglish
Pages (from-to)4358-4363
Number of pages6
JournalLangmuir
Volume24
Issue number8
DOIs
Publication statusPublished - 2008 Apr 15
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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