Abstract: The present invention relates to a system for characterizing at least one of the oxidation stability and the thermal stability of a fuel sample. The system comprises at least a device (MSIE) for performing an electrochemical impedance spectroscopy measurement in the sample, and a device (MDM) for determining deposit mass forming in the fuel sample. The invention further relates to a method for characterizing at least one of the oxidation stability and the thermal stability of the fuel over time, from measurements performed by the system according to the invention.

Abstract: A method for preparing a catalytic material of an electrode for electrochemical reduction reactions, which comprises: a) a step of electrolysis of at least one aqueous and/or organic solution comprising at least one precursor of the active phase comprising at least one group VIB metal in order to obtain a solution comprising at least one precursor comprising at least one group VIB metal which has been partially reduced; b) a step of impregnation of said support with said solution obtained in step a) in order to obtain a catalytic material precursor; c) a step of drying said precursor obtained in step b) at a temperature below 250° C., without subsequent calcination; d) a step of sulfurization of the catalytic material precursor obtained in step c) at a temperature of between 100° C. and 600° C.

Abstract: A process for the preparation of a catalytic material of an electrode for electrochemical reduction reactions, said material comprising an active phase based on at least one metal from group VIb and an electroconductive support, which process is carried out according to at least the following stages: a stage of bringing said support into contact with at least one solution containing at least one precursor of at least one metal from group VIb; a drying stage at a temperature of less than 250° C., without a subsequent calcination stage; a stage of sulfurization at a temperature of between 100° C. and 600° C.