Detection of short-lived intermediates in electrochemical reactions using time-resolved surface-enhanced Raman spectroscopy
- The City College of The City Univ. of New York, NY (USA)
p-Nitrobenzoic acid (PNBA) is studied by real-time detection of SERS spectra during time-resolved optical multichannel recording following the application of a double potential step to a Ag electrode. The spectral bands of three stable intermediate products, p-nitrosobenzoate, hydroxylamine, and azoxy compounds are observed. In addition, the transient bands of an unstable intermediate are seen at 996, 1233, and 1580 cm{sup {minus}1} with a lifetime of about 70 ms during the oxidation process of the hydroxylamine compound which itself is generated electrochemically by a 200-ms potential pulse. We suggest these bands represent the p-nitrosobenzoate free-radical anion intermediate formed during the oxidation of the hydroxylamine compound.
- OSTI ID:
- 6329682
- Journal Information:
- Journal of Physical Chemistry; (USA), Vol. 94:12; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
Similar Records
Determination of Technetium and its Speciation by Surface Enhanced Raman Spectroscopy
Mechanistic differences between electrochemical and gas-phase thermal oxidation of platinum-group transition metals as discerned by surface-enhanced Raman spectroscopy