Abstract:Using CoCl2-SnCl2-1-ethyl-3-methylimidazole chloride (EMIC) ionic liquid with carbon paper as the matrix, SnCo0.73 alloy fibers were obtained by template-free electrodeposition at -0.5V constant potential. PtSn23.2Co17.4 were prepared after chemical reduction in K2PtCl4 solution and ascorbic acid. Electrochemical tests show that the electrochemical activity area (ECSA) of PtSn23.2Co17.4 fibers decreases more slowly than the commercial catalyst (JM-Pt/C) after 500 cycles. At 0.85V, the mass specific activity and area specific activity of PtSn23.2Co17.4 fibers are 23.35 mA?mg-1 and 0.048 mA?cm-2, respectively, which are 1.3 times and 1.5 times of the JM-Pt/C catalyst, respectively. At 0.9 V, the mass specific activity and area specific activity of PtSn23.2Co17.4 fibers are 12.67 mA?mg-1 and 0.026 mA?cm-2, respectively, which are 2.6 times and 3.3 times as much as those of the JM-Pt/C catalyst, respectively. After 500 cycles, the mass activity and area specific activity of PtSn23.2Co17.4 fibers are significantly higher than those of the JM-Pt/C catalyst at 0.85 and 0.9 V. In addition, carbon paper loaded with PtSn23.2Co17.4 fibers can be directly assembled into the fuel cell as an electrode, which simplifies the preparation process of the fuel cell.