In Situ X-ray Absorption Spectroscopy : a Complementary Tool for Molecular Electrochemistry
Daniela Mendoza a b, Si-Thanh Dong a, Baptiste Maurice a, Elodie Anxolabéhère-Mallart b, Marc Robert b, benedikt Lassalle a
a Synchrotron SOLEIL, L'Orme des Merisiers, 91190 Saint-Aubin, France
b Laboratoire d'Electrochimie Moléculaire, Université Paris Cité, 75013 Paris, France
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
In situ/operando characterization of electrochemical energy materials with synchrotron X-ray techniques - #Operax
Sevilla, Spain, 2025 March 3rd - 7th
Organizers: Carlos Escudero and Juan Jesús Velasco Vélez
Invited Speaker, benedikt Lassalle, presentation 395
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.395
Publication date: 16th December 2024

Molecular electrochemistry has been complemented for several decades by spectroscopic measurements performed under in situ conditions, a method known as spectroelectrochemistry. Several spectroscopic techniques have been used in this configuration to provide structural insight in the understanding of molecular reactions mechanisms. In this talk, we will present how X-ray absorption spectroscopy, a synchrotron-based technique, can be instrumental in determining the local and electronic structure of electrochemically generated molecular species.

We will focus on the particular case of iron porphyrins, which are very efficient catalysts for the electrochemical reduction of CO2 into CO.1 We will first present a spectroelectrochemical cell specifically designed for the study of homogeneous molecular species generated electrochemically, together with a dedicated chamber for X-ray spectroscopic experiments. We will then present and analyze the X-ray absorption spectra collected on the starting Fe(III) species and its counterparts reduced by one, two or three electrons. Comparing the data collected under argon or CO2 will provide clues on the interactions between this substrate and the metal center, as well as on the CO2 reduction mechanism.2 Finally, we will discuss the possibility to perform similar experiments with time-resolution on electrochemically generated molecular species.

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