Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 47: Poster DS (joint session DS/MM/O)
MM 47.24: Poster
Wednesday, March 20, 2024, 17:00–19:00, Poster B
In situ optical tracking of oxidation state changes of NiFe alloys by Reflectance Anisotropy Spectroscopy — •Sandhya Chandola1, Karuppasamy Dharmaraj2, Jörg Rappich1, Norbert Esser3,4, and Sonya Calnan2 — 1Young Investigator Group Nanoscale Solid-Liquid Interfaces (CE-NSLI), Hahn-Meitner-Platz 1, 14109 Berlin, Germany — 2Kompetenzzentrum Photovoltaik Berlin, Schwarzschildstr. 3, 12489 Berlin, Germany — 3Institut für Festkörperphysik, TU Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 4Leibniz-Institut für Analytische Wissenschaften ISAS e.V., Schwarzschildstr. 8, 12489 Berlin, Germany
The oxygen evolution reaction (OER) is a key reaction involved in water splitting and has attracted increasing attention for hydrogen generation for clean energy uses. Nickel/iron (NiFe)-based compounds have been known as active OER catalysts for decades, and there has been increasing interest in developing NiFe-based materials for higher activity and stability.
Reflection Anisotropy Spectroscopy (RAS) in the visible spectral range is a polarisation sensitive optical spectroscopy technique used to study morphological and electronic structure changes of surfaces and thin films in-situ. It achieves high sensitivities in the detection of ultrathin layer structures down to the sub-nanometer scale and can follow the optical changes of the surface during catalytic reactions. By combining in-situ RAS and cyclic voltammetry (CV), the changes in both the redox state and structural phase during OER activity of NiFe alloys can be optically tracked.
Keywords: NiFe hydroxide; Oxygen Evolution Reaction; Electrocatalysis; In-situ; Spectroscopy