Al-Pt compounds catalyzing the oxygen evolution reaction.

Al-Pt compounds have been systematically studied as electrocatalysts for the oxygen evolution reaction (OER). Considering the harsh oxidative conditions of the OER, all Al-Pt compounds undergo modifications during electrochemical experiments. However, the degree of changes strongly depends on the composition and crystal structure of a compound. In contrast to Al-rich compounds (AlPt and AlPt), which reveal strong leaching of aluminum, changes in other compounds (AlPt, AlPt, rt-AlPt, AlPt, and rt-AlPt) take place only on the surface or in the near-surface region. Furthermore, surface modification leads to a change in the electronic structure of Pt, giving rise to the formation of catalytically more active surfaces, which are composed of intermetallic compounds, Pt-rich AlPt phases and Pt oxides. Forming a compromise between sufficient OER activity and stability, AlPt and AlPt can be considered as precursors for OER electrocatalysts.