Strong Activity Changes Observable during the First Pretreatment Cycles of Trimetallic PtNiMo/C Catalysts

Danisman B, Zhang GR, Baumunk AF, Yang J, Brummel O, Darge P, Mayrhoferhttps KJ, Libuda J, Ledendecker M, Etzold BJ (2023)

Publication Type: Journal article

Publication year: 2023

Journal

DOI: 10.1002/celc.202300109

Abstract

Pt-based alloy catalysts supported on carbon are commonly characterized for oxygen reduction reaction (ORR) activity using the rotating disk electrode technique (RDE). Within this study, we show exemplarily for PtNiMo/C catalysts that the applied pretreatment influences strongly the determined activity. The classically employed descriptor of unchanged cyclic voltammetry response is insufficient to portrait completed surface restructuring, and gives an incorrect impression that stable activity can be determined. This might be one of the reasons for the strongly deviating activities reported in literature. Following the changes in activity during pretreatment also with in-situ FTIR and online dissolution measurements gives insights to an up to now largely overseen high activity of the trimetallic catalysts. A maximum activity of 0.57 mA cmPt⁻² at 0.95 VRHE is reached quickly during the first six cycles and decreases slowly subsequently. The maximum activity and change of activity over the cycle number is affected by the scan rate and electrolyte refreshing, while the gas atmosphere plays only a minor role. This exemplary study might be important for Pt alloy catalysts in general.

Authors with CRIS profile

Involved external institutions

Technische Universität Darmstadt Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) Germany (DE)

How to cite

APA:

Danisman, B., Zhang, G.R., Baumunk, A.F., Yang, J., Brummel, O., Darge, P.,... Etzold, B.J. (2023). Strong Activity Changes Observable during the First Pretreatment Cycles of Trimetallic PtNiMo/C Catalysts. ChemElectroChem. https://doi.org/10.1002/celc.202300109

MLA:

Danisman, Bilal, et al. "Strong Activity Changes Observable during the First Pretreatment Cycles of Trimetallic PtNiMo/C Catalysts." ChemElectroChem (2023).

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