Fig. 4From: Characterization of Au and Bimetallic PtAu Nanoparticles on PDDA-Graphene Sheets as Electrocatalysts for Formic Acid OxidationXPS spectra of Au 4f and Pt 4f binding energies in the Au/PDDA-G and PtAu/PDDA-G electrocatalystBack to article page