In situ Surface Fourier Transform Study of Complexes of Lithium, Magnesium Potassium, and Lanthanum Ferrocyanide at Platinum and Gold Electrodes

摘要

The working electrode was either a platinum or gold disk (1 cm diameter), which had been polished to a mirror finish using progressively smaller diameters of alumina down to 0.05 micro meters. The disk was mounted on the end of a glass syringe barrel designed to fit the infrared cell. The cell construction was of the thin layer type and has been described previously. A platinum wire quasi-reference electrode was used throughout these experiments. The spectrometer employed was a vacuum bench Brucker-IBM model IR/98 FTIR on which subtractively normalized interfacial Fourier transform infrared spectroscopy (SNIFTIRS9) could be performed. In SNIFTIRS difference spectra, the data are displayed so that bands extending to positive (upwards) values of relative reflectance are due to species at the base reference potential ('reactants' in the unperturbed system), while negative bands denote species formed when the potential is stepped to a new value (the 'products' of the electrochemical reaction). Electrodes. (jes)