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. 2023 Mar;35(9):e2207635.
doi: 10.1002/adma.202207635. Epub 2023 Jan 5.

Microscale Combinatorial Libraries for the Discovery of High-Entropy Materials

Lars Banko  1 , Emmanuel Batsa Tetteh  2 , Aleksander Kostka  3 , Tobias Horst Piotrowiak  1 , Olga Anna Krysiak  2 , Ulrich Hagemann  4 , Corina Andronescu  5 , Wolfgang Schuhmann  2 , Alfred Ludwig  1   3
Affiliations

Microscale Combinatorial Libraries for the Discovery of High-Entropy Materials

Lars Banko et al. Adv Mater. 2023 Mar.

Abstract

Polyelemental material systems, specifically high-entropy alloys, promise unprecedented properties. Due to almost unlimited combinatorial possibilities, their exploration and exploitation is hard. This challenge is addressed by co-sputtering combined with shadow masking to produce a multitude of microscale combinatorial libraries in one deposition process. These thin-film composition spreads on the microscale cover unprecedented compositional ranges of high-entropy alloy systems and enable high-throughput characterization of thousands of compositions for electrocatalytic energy conversion reactions using nanoscale scanning electrochemical cell microscopy. The exemplary exploration of the composition space of two high-entropy alloy systems provides electrocatalytic activity maps for hydrogen evolution and oxygen evolution as well as oxygen reduction reactions. Activity optima in the system Ru-Rh-Pd-Ir-Pt are identified, and active noble-metal lean compositions in the system Co-Ni-Mo-Pd-Pt are discovered. This illustrates that the proposed microlibraries are a holistic discovery platform to master the multidimensionality challenge of polyelemental systems.

Keywords: combinatorial electrocatalyst discovery; composition space; electrocatalysis; high-entropy materials; microlibraries.

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