Skip to Main content Skip to Navigation
Journal articles

Unraveling the link between catalytic activity and agglomeration state with SECM and AFM

Alice Boudet 1 Olivier Henrotte 1 Ndrina Limani 1 Fatima El Orf 1 Frédéric Oswald 1 Bruno Jousselme 1 Renaud Cornut 1 
1 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : Scanning electrochemical microscopy (SECM) is at the forefront of a new generation of tools enabling to investigate the local properties of catalysts [1]. Thanks to its ability to study a very low amount of material with almost no additives such as a polymeric binder (Nafion), the intrinsic activity of catalysts gets accessible and characterizations can be performed at agglomerate scale. Herein, we propose to combine for the first time SECM with atomic force microscopy (AFM) characterizations to study the link between the catalytic activity and the agglomeration state of non-PGM (platinum group metal) ORR catalysts. SECM is performed with the redox competition mode in acidic media, following the protocol developed recently in our group [2]. AFM images are then used to determine the agglomeration state in the deposits of catalysts. Two PGM-free ORR catalysts were investigated at different loadings [3]. Differences in term of dispersion, stability of the inks and adherence on the substrate were observed, which highlights the importance of measuring the exact amount and agglomeration state of the material deposited. The agglomeration states of the deposits measured by AFM enabled to explain the differences in activity measured by SECM. The performances of the catalysts were compared and the contributions of the intrinsic activity and the agglomeration state were separated. These results illustrate that our approach is suitable for the characterization of catalysts at agglomerate scale, with various applications from the benchmarking of new catalysts to the optimization of an ink formulation.
Document type :
Journal articles
Complete list of metadata

https://hal-cea.archives-ouvertes.fr/cea-03530305
Contributor : Serge Palacin Connect in order to contact the contributor
Submitted on : Monday, January 17, 2022 - 7:06:55 PM
Last modification on : Tuesday, September 27, 2022 - 4:38:56 AM

Identifiers

Citation

Alice Boudet, Olivier Henrotte, Ndrina Limani, Fatima El Orf, Frédéric Oswald, et al.. Unraveling the link between catalytic activity and agglomeration state with SECM and AFM. ECS Meeting Abstracts, IOP Publishing, 2021, MA2021-02 (49), pp.1421-1421. ⟨10.1149/ma2021-02491421mtgabs⟩. ⟨cea-03530305⟩

Share

Metrics

Record views

17