Time-resolved X-ray absorption spectroelectrochemistry of redox active species in solution
Khaled Cheaib1, Baptiste Maurice2, Tiphaine Mateo2
1Institut de Chimie Moléculaire et des Matériaux d'Orsay (UMR CNRS 8182), Université Paris-Sud, Batiment 420, Rue du Doyen G. Poitou, 91405 Orsay, France.
Abstract:
Electrochemistry and electrocatalysis have been receiving increased attention recently due to their crucial contribution to electrical-to-chemical conversion systems. We describe here the development and operation of a new spectroelectrochemical transmission cell for time-resolved X-ray absorption spectroscopy of solutions. X-ray absorption spectra were recorded on the ROCK beamline of SOLEIL under constant and scanning potentials. Spectra were recorded at a frequency of 2 Hz during a cyclic voltammetry experiment performed on a 20 mM solution of FeIIICl3·6H2O at 20 mV s-1 scanning speed. Spectra with good signal-to-noise ratios were obtained when averaging ten spectra over 5 s, corresponding to a 100 mV potential range. A 90% conversion rate from Fe(III) to Fe(II) was spectroscopically demonstrated in cyclic voltammetry mode.
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