Ruihan Li, Jakob Michael Reinke, Abharana N, Scott A Barnett, Linsey C. Seitz. “Proof of concept demonstration of exsolution as a method for preparing nanoparticle hydrogen evolution reaction catalysts.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15007986/v1

Values presented only in diffraction patterns, scanning transmission electron micrographs, ICP-MS plots, impedance spectra, voltammograms, or other plots or images were not transcribed. Hydrogen-evolution performance and durability data were not retained. The supporting information is appended to the main paper

As-synthesized Sr₀.₉₅Ti₀.₃Fe₀.₆₃Ru₀.₀₇O₃−δ
Powder XRD, Cu Kα radiation An unidentified minor phase was present
STEM Only sub-micrometer particles were observed
Electrochemical double-layer capacitance Approximately 1.5 mF
Main, pp. 6–7, 10; SI, p. S1
Sr₀.₉₅Ti₀.₃Fe₀.₆₃Ru₀.₀₇O₃−δ reduced in 97 % H₂–3 % H₂O at 500 °C for 4 h
STEM Nanoparticles smaller than 10 nm were observed on the surfaces of sub-micrometer oxide particles
Main, p. 7
Sr₀.₉₅Ti₀.₃Fe₀.₆₃Ru₀.₀₇O₃−δ reduced in 97 % H₂–3 % H₂O at 800 °C for 4 h
STEM A mixture of nanoparticles smaller than 10 nm and particles 20–30 nm in size was observed on the surfaces of sub-micrometer oxide particles
Main, p. 7
Reduced Sr₀.₉₅Ti₀.₃Fe₀.₆₃Ru₀.₀₇O₃−δ series
Powder XRD, Cu Kα radiation Oxide peaks shifted toward lower 2θ and larger d-spacing with increasing reduction temperature and time; the unidentified minor phase persisted below 700 °C and disappeared after higher-temperature treatment; no peaks from metallic Ru or other oxide structures such as Ruddlesden–Popper phases were observed