Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.125
Publication date: 11th July 2022
The field of electrocatalysis experienced an intensely increased interest in the last years due to the urgency to move from a fossil fuel-based industry to one based on green energy. While new electrocatalyst materials are urgently needed, their rational design is still largely hindered by the lack of knowledge about the nature and structure of active centers in differently synthesized catalyst materials and the understanding of operational parameters that influence the catalysis.
Recently, high entropy alloys (HEA) or complex solid solutions (CSS) emerged as new promising materials in the field of electrocatalysis. A minimum of 5 different elements are mixed together, leading to a HEA material stabilized by entropy. Theoretical studies indicate that such materials, which possess many surface atom arrangements with different binding energies, could generate surfaces with an increased density of optimal or close to the optimal binding energy.[1] This may lead to increased activity compared with the already established catalyst and this was recently shown to be the case for the oxygen reduction reaction.[2]
One of the big challenges in the CSS research field arises from the multitude of possible surface atoms arrangement which could result from mixing five different elements. Exploring millions of possible combinations requires the use of high-throughput methods as well as new strategies to explore the space. Besides, the experimental probing and the identification of the surface atom arrangements with increased activity is impossible using classical electrochemical techniques.
Here we will show the potential of two high-throughput techniques: scanning droplet cell (SDC) [3,4] and scanning electrochemical cell microscopy (SECCM) to evaluate the multitude of active sites present in a complex solid solution (CSS).[5] By combining the two techniques and using a zooming-in approach from macro to the nanoscale, we can see an increase in the distribution of active sites in a HEA material.
We acknowledge the financial support by the German Research Foundation (Deutsche Forschungsgemeinschat, DFG) in the framework of the DFG project LU1175/31-1 and AN 1570/2-1 (440951282).
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