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Méthode pour l’analyse de l’activité de la réduction de l’oxygène de catalyseurs sans métaux nobles par microscopie électrochimique.

Abstract : The decrease of fuel cells cost is necessary to provide a worldwide access to the technology. Synthesis of noble metal-free catalysts is a promising way to achieve this goal. The electrochemical analysis of these materials is however not easy either to compare the electrocatalytic properties or to understand the performances of these catalysts. The scientific community generally studies catalysts at a macroscale, where the recorded response is averaged on a very large number of catalytic objects. The works presented here shows the setup of a method to analyze the electrocatalytic activity of noble metal-free catalyst for the oxygen reduction reaction in acidic media by scanning electrochemical microscopy. This method brings several advantages such as the possibility to study and compare multiple catalysts on the same sample at a macro- or a microscale. The comparison of several catalysts with this setup is then. A catalyst has been studied under various conditions of: loading, surface area, weight of catalyst and quantity of additives such as Nafion. The investigation of the material stability is also illustrated. These results suggest large range of application of the technique and many possibilities in the future are now open to investigated noble metal-free electrocatalytic materials.
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Submitted on : Wednesday, December 16, 2020 - 1:02:41 AM
Last modification on : Thursday, July 1, 2021 - 4:45:03 PM
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  • HAL Id : tel-03070793, version 1

Citation

Olivier Henrotte. Méthode pour l’analyse de l’activité de la réduction de l’oxygène de catalyseurs sans métaux nobles par microscopie électrochimique.. Chimie analytique. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLS473⟩. ⟨tel-03070793⟩

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