Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.167
Publication date: 11th July 2022
Finding new materials for different electrocatalytic reactions for renewable energy conversion is essential to build a sustainable future. High entropy alloys (HEAs), in which 5 or more elements are mixed forming a new crystallographic structure, have emerged as a new class of materials with interesting properties for electrocatalysis1. There are innumerable possibilities of combining the metals, which allows tailoring the electrocatalytic properties by tuning electronic and geometric effects in the HEA. In addition, investigating these multifunctional electrocatalysts can be used as a platform for the discovery of novel sustainable materials. However, there is a lack of information regarding how the elements distribute on the surface and their stability and structure under different applied potential conditions, which is crucial for the rationalization of energy conversion reactions. Thus, potential-controlled experiments and benchmarking with model well-known monometallic electrode surfaces are necessary to assess catalytic and interfacial properties of HEAs2. In this work, we investigate the oxidation of carbon monoxide on an extended high entropy alloy electrocatalyst over a wide range of pH3. We combine electrochemical characterization with surface-sensitive techniques including x-ray photoelectron spectroscopy and ion scattering spectroscopy to gain an understanding on the structure-reactivity relations.
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