In Situ Resonance Raman Spectroscopic Characterization of Electrogenerated Methyl Viologen Radical Cation on Carbon Electrode

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In situ Raman spectroscopic characterization of solution and surface species on a carbon electrode is reported. An optical flow-through cell has been designed for the characterization of electrode surfaces and electrogenerated solution species during an electrochemical reaction. The electrogeneration of the methyl viologen (1,1'-dimethyl-4,4'-bipyridine) radical cation (MV+) at a carbon electrode in aqueous chloride solution has been studied with the use of laser Raman spectroscopy. In the case of the radical ion, resonance enhancement of the order of 25-30 was observed with 514.5 nm excitation. The effect of concentration, potential, and flow rate on the observed spectrum is discussed. Time-dependent studies with optical multichannel analyzer detection suggest the formation of a multilayer film on the electrode.

Keywords: Raman spectroscopy

Document Type: Research Article


Affiliations: Corporate Research Laboratories, Monsanto Company, 800 N. Lindbergh Blvd., St. Louis, Missouri 63167

Publication date: February 1, 1986

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