In Situ Stability Studies of Platinum Nanoparticles Supported on Ruthenium-Titanium Mixed Oxide (RTO) for Fuel Cell Cathodes

Journal article


Publication Details

Author(s): Hornberger E, Bergmann A, Schmies H, Kuehl S, Wang G, Drnec J, Sandbeck DJS, Ramani V, Cherevko S, Mayrhofer K, Strasser P
Journal: ACS Catalysis
Publisher: AMER CHEMICAL SOC
Publication year: 2018
Volume: 8
Journal issue: 10
Pages range: 9675-9683
ISSN: 2155-5435


Abstract

Using a variety of in situ techniques, we tracked the structural stability and concomitantly the electrocatalytic oxygen reduction reaction (ORR) of platinum nanoparticles on ruthenium-titanium mixed oxide (RTO) supports during electrochemical accelerated stress tests, mimicking fuel cell operating conditions. High-energy X-ray diffraction (HE-XRD) offered insights in the evolution of the morphology and structure of RTO-supported Pt nanoparticles during potential cycling. The changes of the atomic composition were tracked in situ using scanning flow cell measurements coupled to inductively coupled plasma mass spectrometry (SFC-ICP-MS). We excluded Pt agglomeration, particle growth, dissolution, or detachment as cause for the observed losses in catalytic ORR. activity. Instead, we argue that Pt surface poisoning is the most likely cause of the observed catalytic rate decrease. Data suggest that the gradual growth of a thin oxide layer on the Pt nanoparticles due to strong metal-support interaction (SMSI) is the most plausible reason for the suppressed catalytic activity. We discuss the implications of the identified catalyst degradation pathway, which appear to be specific for oxide supports. Our conclusions offer previously unaddressed aspects related to oxide-supported metal particle electrocatalysts frequently deployed in fuel cells, electrolyzers, or metal-air batteries.


FAU Authors / FAU Editors

Mayrhofer, Karl Prof. Dr.
Lehrstuhl für Elektrokatalyse (HIERN)


External institutions with authors

European Synchrotron Radiation Facility (ESRF)
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Fritz-Haber-Institut der Max-Planck-Gesellschaft (FHI)
Technische Universität Berlin
Washington University


How to cite

APA:
Hornberger, E., Bergmann, A., Schmies, H., Kuehl, S., Wang, G., Drnec, J.,... Strasser, P. (2018). In Situ Stability Studies of Platinum Nanoparticles Supported on Ruthenium-Titanium Mixed Oxide (RTO) for Fuel Cell Cathodes. ACS Catalysis, 8(10), 9675-9683. https://dx.doi.org/10.1021/acscatal.8b02498

MLA:
Hornberger, Elisabeth, et al. "In Situ Stability Studies of Platinum Nanoparticles Supported on Ruthenium-Titanium Mixed Oxide (RTO) for Fuel Cell Cathodes." ACS Catalysis 8.10 (2018): 9675-9683.

BibTeX: 

Last updated on 2019-13-08 at 12:53