Scrutinizing Intrinsic Oxygen Reduction Reaction Activity of a Fe−N−C Catalyst via Scanning Electrochemical Cell Microscopy

Author:

Limani Ndrina12ORCID,Batsa Tetteh Emmanuel2ORCID,Kim Moonjoo23,Quast Thomas2ORCID,Scorsone Emmanuel4,Jousselme Bruno1ORCID,Schuhmann Wolfgang2ORCID,Cornut Renaud1ORCID

Affiliation:

1. Universite Paris-Saclay CEA, CNRS, NIMBE, LICSEN Gif-sur-Yvette 91191 France

2. Analytical Chemistry-Center for Electrochemical Sciences (CES) Faculty of Chemistry and Biochemistry Ruhr University Bochum Universitätsstraße 150 Bochum Germany

3. Department of Chemistry Seoul National University Seoul 08826 Republic of Korea

4. Université Paris-Saclay CEA, List 91120 Palaiseau France

Abstract

AbstractCarbon‐based nanomaterials are renowned for their exceptional properties, making them propitious candidates for oxygen reduction reaction (ORR) electrocatalysis. However, their intrinsic activity is often challenging to investigate unambiguously with conventional methodologies due to the inherent complexities of such systems and the material itself. Zooming into the material and gaining electrochemical information with high resolution is a way to get rid of many experimental factors that influence the catalytic activity in macro‐scale measurements. Herein, we employ nano‐scale scanning electrochemical cell microscopy (SECCM) to investigate individual catalyst agglomerates with and without Nafion content. The intrinsic ORR activity of the catalyst was unravelled by using a unique approach of normalizing the data of all measured points by their distinctive electrochemical surface area (ECSA). When coupling with scanning electron microscopy (SEM), the structure and morphology of the catalytically active agglomerates were visualized.

Publisher

Wiley

Subject

Electrochemistry,Catalysis

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