Fumiharu Kusaka, Naoto Todoroki. “From promotion to poisoning: temperature- and coverage-dependent effects of trace Fe on the hydrogen evolution activity of Pt.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15007947/v1

Values presented only in X-ray photoelectron spectra, voltammograms, chronopotentiometry curves, impedance spectra, or other plots or images were not transcribed. Electrochemical hydrogen-evolution performance data were not retained

As-prepared 0.1 M KOH
ICP-MS Fe concentration: less than 0.2 ppb
Main, p. 21
Pt surface after chronopotentiometry at −10 mA cm⁻² in 0.1 M KOH containing 60 ppb Fe at 298 K
Ex situ XPS, Fe 2p The deposited Fe species were in a chemical state consistent with Fe(OH)₂; the Fe³⁺:Fe²⁺ component-intensity ratio was nearly identical to that reported for Fe(OH)₂
Ex situ XPS, O 1s The spectrum was dominated by the OH⁻ component