Figure 3: SHINERS-satellite study of CO oxidation over PtFe bimetallic nanocatalysts.

(a) XPS study to determine the valence state of Fe in the PtFe nanoalloy. (b) Catalytic performance of the PtFe nanoalloy and a Pt monometallic nanocatalyst for CO oxidation at different temperatures. (c) SHINERS-satellite spectra of CO oxidation over the PtFe nanoalloy and the Pt monometallic nanocatalyst at 30 °C. The inset of c shows that a red shift of the Pt–C stretching vibration occurs for the PtFe nanoalloy compared to the Pt monometallic nanocatalyst.