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Ferreira Gomes Lobo, Bruna ; Loukrakpam, Rameshwori ; Lobo, Carlos M. S. ; Bystron, Tomas ; Prokop, Martin ; Albuquerque, Rodrigo Q. ; Xia, Lu ; Jiang, Wulyu ; García de Arquer, F. Pelayo ; Bouzek, Karel ; Roth, Christina:
Real-time probing of adsorption dynamics on Pt nanoparticles : Competitive interactions and site blocking in electrocatalysis.
In: Surfaces and Interfaces.
Bd. 98
(2026)
.
- 110279.
ISSN 2468-0230
DOI: https://doi.org/10.1016/j.surfin.2026.110279
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Angaben zu Projekten
| Projekttitel: |
Offizieller Projekttitel Projekt-ID SFB 1585: Strukturierte Funktionsmaterialien für multiplen Transport in nanoskaligen räumlichen Einschränkungen 492723217 Live-XAS 05K22WC1 HighHy - Development of highly active anodes for anion exchange membrane electrolysers to enable low-cost green hydrogen 03SF0689B The Energy Conversion and Storage CZ.02.01.01/00/22_008/0004617 |
|---|---|
| Projektfinanzierung: |
Deutsche Forschungsgemeinschaft Bundesministerium für Forschung, Technologie und Raumfahrt Czech Science Foundation |
Abstract
Electrochemical energy conversion involves both steady-state and transient phenomena, with the latter being difficult to probe under realistic conditions. Conventional in-situ/operando X-ray absorption spectroscopy often lacks time resolution and provides mainly qualitative insights. In this study, we show that the Δμ XANES method, applied on the Pt/H3PO3 system, enables potential-dependent tracking of surface speciation and relative changes in adsorbate populations. It distinguishes H3PO3 concentrations and reveals competition for Pt sites among O-, H-, CO-, H3PO3- and H3PO4-derived species. Despite XAS being bulk-sensitive, Δμ yields indirect yet reliable surface information. Coupled with time-resolved fixed-energy X-ray absorption voltammetry (FEXRAV), the transient evolution of the Pt electronic structure is monitored during CO stripping, revealing dynamic electronic changes that precede the maximum electrochemical oxidation current. The complementary use of FEXRAV and Δμ XANES correlates these transient electronic responses with the underlying surface speciation, providing mechanistic insight into competitive adsorption on Pt. Machine learning validation confirms predictive power despite low signal-to-noise ratio. This establishes the combination of Δμ XANES and FEXRAV as a versatile tool for probing interfacial dynamics in fuel cells, electrolyzers, and CO2 reduction technologies that can be readily implemented at conventional XAS beamlines.