results implied thatthe PtxCo1−x/C electrodes were more conductive to electrontransfer than the Pt/C electrode. Furthermore, the electrode ofPt0.7Co0.3/C was better than Pt0.55Co0.45/C, which is consistent withthe results deduced from ESCA. The Lattice parameter, the electro-chemically active surface areas (ECSA) and the electron transferresistance (Rct) of all modified electrodes were summarized inTable 1.