Cobalt Oxide-Supported Pt Electrocatalysts: Intimate Correlation between Particle Size, Electronic Metal-Support Interaction and Stability

Bertram M, Prössl C, Ronovský M, Knöppel J, Matvija P, Fusek L, Skála T, Tsud N, Kastenmeier M, Matolín V, Mayrhofer KJ, Johánek V, Mysliveček J, Cherevko S, Lykhach Y, Brummel O, Libuda J (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 11

Pages Range: 8365-8371

Journal Issue: 19

DOI: 10.1021/acs.jpclett.0c02233

Abstract

Oxide supports can modify and stabilize platinum nanoparticles (NPs) in electrocatalytic materials. We studied related phenomena on model systems consisting of Pt NPs on atomically defined Co3O4(111) thin films. Chemical states and dissolution behavior of model catalysts were investigated as a function of the particle size and the electrochemical potential by ex situ emersion synchrotron radiation photoelectron spectroscopy and by online inductively coupled plasma mass spectrometry. Electronic metal-support interaction (EMSI) yields partially oxidized Ptδ+ species at the metal/support interface of metallic nanometer-sized Pt NPs. In contrast, subnanometer particles form Ptδ+ aggregates that are exclusively accompanied by subsurface Pt4+ species. Dissolution of Cox+ ions is strongly coupled to the presence of Ptδ+ and the reduction of subsurface Pt4+ species. Our findings suggest that EMSI directly affects the integrity of oxide-based electrocatalysts and may be employed to stabilize Pt NPs against sintering and dissolution.

Authors with CRIS profile

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) Germany (DE) Univerzita Karlova v Praze / Charles University in Prague Czech Republic (CZ)

How to cite

APA:

Bertram, M., Prössl, C., Ronovský, M., Knöppel, J., Matvija, P., Fusek, L.,... Libuda, J. (2020). Cobalt Oxide-Supported Pt Electrocatalysts: Intimate Correlation between Particle Size, Electronic Metal-Support Interaction and Stability. Journal of Physical Chemistry Letters, 11(19), 8365-8371. https://doi.org/10.1021/acs.jpclett.0c02233

MLA:

Bertram, Manon, et al. "Cobalt Oxide-Supported Pt Electrocatalysts: Intimate Correlation between Particle Size, Electronic Metal-Support Interaction and Stability." Journal of Physical Chemistry Letters 11.19 (2020): 8365-8371.

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