Infrared photothermal deflection spectroscopy: A new probe for the investigation of electrochemical interfaces

Infrared photothermal deflection spectroscopy: A new probe for the investigation of electrochemical interfaces

TitleInfrared photothermal deflection spectroscopy: A new probe for the investigation of electrochemical interfaces
Publication TypeJournal Article
Year of Publication1996
AuthorsZhongyi Deng, Jonathan D Spear, James D Rudnicki, Frank R McLarnon, Elton J Cairns
JournalJournal of the Electrochemical Society
Volume143
1514
Issue5
Pagination1514-1521
Date Published05/1996
Keywordselectrochemical electrodes, electrolytes, foils, infrared spectroscopy, interface phenomena, lithium, photothermal spectroscopy, probes
Abstract

An infrared photothermal deflection spectroscopy system has been developed using infrared tunable diode lasers in the wavelength region from 8 to 16 μm. This system allows the collection of in situ optical absorption spectra of species at electrode/electrolyte interfaces in an electrochemical cell. The infrared spectra of LiOH and Li2CO3 formed on the surface of a lithium foil were recorded. The infrared photothermal deflection spectroscopy technique has been used to monitor the lithium electrode surface in an operating cell, Li/P(EO)8LiN(CF3SO2)2/Ni. The in situ spectra (in the 800-1000cm-1 region) show that the film formation at Li/polymer electrolyte interfaces is dominated by LiOH, although there also appears to be organic species in the surface film.

DOI10.1149/1.1836672