Direct propylene epoxidation via water activation over Pd-Pt electrocatalysts

Direct electrochemical propylene epoxidation using water oxidation intermediates presents a sustainable alternative to existing routes that involve hazardous chlorine or peroxide reagents. Here we report an oxidized palladium-platinum alloy catalyst (PdPtOx/C), which reaches a Faradaic efficiency of 66±5% toward propylene epoxidation at 50 mA/cm2 at ambient temperature and pressure. Embedding platinum into the palladium oxide crystal structure stabilized oxidized platinum species, resulting in improved catalyst performance. The reaction kinetics suggest that epoxidation on PdPtOx/C proceeds through electrophilic attack by metal-bound peroxo (OO*) intermediates. This work demonstrates an effective strategy for selective electrochemical oxygen-atom transfer from water, without mediators, for diverse oxygenation reactions., , , # Direct propylene epoxidation via water activation over Pd-Pt electrocatalysts

Tabulated data underlying figures in the manuscript and the supplementary materials.
The Excel file includes multiple sheets named by the figure numbers.

The details of each tab are as follows:

**Fig.1DE**

Direct electrochemical propylene-epoxidation performance with different compositions of Pd-Pt-on-carbon catalysts in (D) water-acetonitrile electrolyte and (E) aqueous electrolyte.

> Data labeling:
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> FE_PO; Faradaic efficiency toward propylene oxide
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> FE_PG; Faradaic efficiency toward propylene glycol

**Fig. 2A S6 - xrd**

Intensities of the X-ray diffraction signal at various diffraction (Intensity (a.u.) vs. two theta (degrees)).

**Fig 2B,3B,S10 XAS Pd K edge**

EXAFS and XANES spectra of standards and catalysts at Pd K-edge.

**Fig 2C,3A,S11 XAS Pt L3 edge**

EXAFS and XANES spectra of standards and catalysts at Pt L3-edge.

> Data labeling:
>
> numbers such as '045'...