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Alfred Larsson. Portrait.

Alfred Larsson

Postdoctoral fellow

Alfred Larsson. Portrait.

Following the Electrochemical Oxidation of Au(111) in Real-Time Using Surface Optical Reflectance and Total-Reflection X-Ray Absorption Spectroscopy

Author

  • A. Grespi
  • A. Larsson
  • G. Abbondanza
  • J. Manidi
  • J. Eidhagen
  • E. Lira
  • A. Ti
  • M. Ramakrishnan
  • J. Just
  • J. Pan
  • L. R. Merte
  • E. Lundgren
Show all

Summary, in English

Under electrochemical polarization, many electrocatalysts can undergo oxidation that alters their reactivity and can lead to restructuring and dissolution. In this context, the structure-property relationships of electrocatalysts, as well as their kinetics and dynamic behaviour, are still poorly understood. This knowledge gap mainly relies on the limitations of many traditional spectroscopic and structure determination methods, which cannot be easily coupled in situ with electrochemical methods. In this work, we performed cyclic voltammetry (CV) combined with 2D surface optical reflectance (2D-SOR) and total reflection X-ray absorption spectroscopy (RefleXAFS) in a single operando experiment, to directly follow the electro-oxidation and reduction of a Au(111) model electrode. Our results show that the surface in 0.05 M H2SO4 forms a self-limiting Au3+ oxide or hydroxide film around 1.5 VRHE during the anodic scan in the CV (2 mV s−1), with a thickness of ∼5 Å estimated from the 2D-SOR measurements. The film is then rapidly reduced during the cathodic scan around 1.1 VRHE.

Department/s

  • Lund Laser Centre, LLC
  • LTH Profile Area: Photon Science and Technology
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • LU Profile Area: Light and Materials
  • Synchrotron Radiation Research
  • NanoLund: Centre for Nanoscience
  • MAX IV Laboratory

Publishing year

2026-04-14

Language

English

Publication/Series

Journal of the Electrochemical Society

Volume

173

Issue

7

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Materials Chemistry
  • Atom and Molecular Physics and Optics

Keywords

  • cyclic voltammetry
  • electrocatalysis
  • operando surface optical reflectance
  • operando total reflection X-ray absorption spectroscopy
  • oxidation

Status

Published

ISBN/ISSN/Other

  • ISSN: 0013-4651