1. Spectroelectrochemistry by Confocal Raman Microspectrometry
- Author
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Laurent Servant, Laurence Vignau, Jean-Claude Lassègues, Joseph Grondin, Jean-Luc Bruneel, and Isabelle Rey
- Subjects
chemistry.chemical_classification ,Supercapacitor ,Chemistry ,Diffusion ,Analytical chemistry ,Polymer ,Electrolyte ,Condensed Matter Physics ,Electrochemistry ,symbols.namesake ,Specific surface area ,symbols ,Raman spectroscopy ,Current density - Abstract
Confocal Raman Microspectrometry is shown to be a powerful technique to study electrochemical devices under working conditions with a spatial resolution of about l μm3. This is first illustrated on a Li/P(EO)20, LiTFSI/Li symmetrical cell where salt concentration gradients in the polymer electrolyte are measured as a function of current density and time. These data give access to transport properties of the polymer electrolyte, namely transport numbers and diffusion coefficients. A second example is provided by electrostatic supercapacitors using activated carbon fabrics of high specific surface area and proton conducting liquid electrolytes. A mapping of a carbon fiber and of the surrounding electrolyte is recorded for ± IV polarizations. The relative intensity and the frequencies of the D and G Raman lines of carbon are found to be very sensitive to the carbon charge.
- Published
- 1998