Abstract:
Pt/Au/Fe
3O
4 nanocomposites were prepared by the continuous reduction method, through loading Pt and Au on the surface of nano Fe
3O
4. The Pt/Au/Fe
3O
4 nanocomposites were characterized by UV-vis spectra, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS); their electrocatalytic activities in methanol oxidation were investigated. The results indicated that Au and Pt are uniformly deposited on Fe
3O
4 surface. The cyclic voltammograms of Pt/Au/Fe
3O
4 suggests that the best catalytic performance is achieved when the amount of H
2PtCl
6 added is 8 mL. Current peak i
p is proportional to the square root of scanning speed (
v1/2) and the catalytic methanol oxidation process is under the control of diffusion. The Pt/Au/Fe
3O
4 nanocomposites remain high active during the measurements of cyclic voltammograms for 201 times, suggesting that Pt/Au/Fe
3O
4 is a kind of anode catalyst materials with high chemical activity and stability.