Following the Electrochemical Oxidation of Au(111) in Real-Time Using Surface Optical Reflectance and Total-Reflection X-Ray Absorption Spectroscopy
Artikel i vetenskaplig tidskrift, 2026
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.
electrocatalysis
oxidation
operando total reflection X-ray absorption spectroscopy
operando surface optical reflectance
cyclic voltammetry
Författare
Andrea Grespi
Lunds universitet
Alfred Larsson
Leiden Institute of Chemistry
Giuseppe Abbondanza
Chalmers, Fysik, Kemisk fysik
J. Manidi
Politecnico di Milano
J. Eidhagen
Alleima Tube AB
E. Lira
Lunds universitet
A. Ti
Lunds universitet
M. Ramakrishnan
Max IV-laboratoriet
Justus Just
Max IV-laboratoriet
Jinshan Pan
Kungliga Tekniska Högskolan (KTH)
L. R. Merte
Malmö universitet
Lunds universitet
Edvin Lundgren
Lunds universitet
Journal of the Electrochemical Society
0013-4651 (ISSN) 1945-7111 (eISSN)
Vol. 173 7 076502Ämneskategorier (SSIF 2025)
Materialkemi
Atom- och molekylfysik och optik
DOI
10.1149/1945-7111/ae5bcf