In this paper, platinum-copper (Pt-Cu) alloy colloid was prepared using the microwave-assisted polyol reduction method with chloroplatinic acid and copper chloride as precursors. During the preparation, the metal particles were loaded on the nitrogen-doped carbon nanotubes (NCNTs) using the sol-gel method. Catalysts with different metal proportions were prepared to investigate the activity of oxygen reduction reaction (ORR), and commercial Pt/C catalyst was used as control. A series of characterizations including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy were employed to study the morphology and composition of the catalysts. The results revealed that the Pt-Cu alloy can be well loaded on NCNTs and displayed good ORR catalytic activities, especially CuPt-NCNT_(1:3) with the mass activities as 0.12A/mgP_t; I_k was 0.56 mA/cm~2P_t, which was better than those of the commercial Pt/C catalyst. It was also found that the half-wave potential and diffusion-limited current curves were close to those of the commercial ones, which demonstrate a simple and effective way to prepare the catalyst for fuel cell.
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