High Entropy Alloy Catalysis How Chemical Complexity Manifest Across Scales

PhD defence by Martin Lillebro Lundquist

Assessment Committee

Professor Henrik Grum Kjærgaard, Kemi, University of Copenhagen (Chairperson)
Professor Georg Madsen, TU Wien
lektor Jin Hyun Chang, DTU Energy

Supervisors

Professor Jan Rossmeisl

Department

Department of Chemistry

Place

Building: Niels Bohr Building, Room: Margrethe Bohr Salen, Jagtvej 155A, 2200, København N

Email address to gain access to the thesis: mlsn@chem.ku.dk.
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Short description of the thesis

What happens when a catalyst becomes chemically complex? This thesis defence explores this question through high entropy alloys as electrocatalysts. How do the presence and arrangement of different atoms shape catalytic performance? Focusing on the electrochemical oxygen reduction reaction, an important process in hydrogen fuel cells, the research follows chemical complexity from the atomic scale to measurable catalytic activity. Rather than treating complexity as a challenge for finding the best catalyst, this work exploits the diverse electronic environments it creates to uncover catalytic phenomena and quantify their impact, providing theoretical design principles for developing more efficient catalysts for sustainable energy technologies.