MDI

1. Deposition of ~10nm Ti adhesion layer 2. Deposition of ~80nm HEA layer 3. Deposition of ~5nm Pt layer

Sustainable catalysts rely on abundant elements which are prone to oxidation. A route to non-noble electrocatalysts is opened by directing the formation of unavoidable surface oxides towards creating a few atomic layers of an active and stable electrocatalyst, which is in direct contact with its metallic, conducting support. This is enabled by combining possibilities of compositionally complex solid solutions with accelerated atomic-scale surface characterization. Surface composition changes from the as-synthesized state to states after exposure to the oxygen evolution reaction (OER) are investigated using a Cantor-alloy-catalyst-coated tip array for atom probe tomography (APT): The film on top of the tip forms a nanoreactor which enables acquisition of intrinsic properties. The as-deposited film has an around 3 nm thick native oxide; short and prolonged OER exposures result in an oxygen-influenced surface layer with lower oxidation depth and altered metal composition. This shows that as-synthesized complex c

Deposition of a ~5nm Pt layer on a Cantor film.

Deposition of Cantor on a Ti adhesion layer

TEM grid probes with sputtered nanoparticles

TEM.zip

Annealed at 600°C, 2 h