Fig. 10: In situ XPS measurements.
From: Designing water resistant high entropy oxide materials
a Ni 2p, (b) Co 2p, (c) Cu 2p, (d) Cr 2p, (e) Zn 2p and (f) Mg 2p XPS spectra of (Ni0.2Mg0.2Cu0.2Zn0.2Co0.2)Cr2O4 before reduction and after reduction at 300 °C in 5%H2/95%N2 (The spectra directly below is before reduction, while the spectra directly above is after reduction). Source data are provided as a Source Data file.
