中文摘要：

研究了催化剂浆液分散时间和分散剂等制备条件对Pt/C催化剂电化学活性的影响.结果表明,催化剂浆液的超声振荡时间和分散剂对Pt/C催化剂性能影响很大.当超声分散10min时,对应的电化学性能最好;低于10min时,催化剂的分散不够完全,性能较差;超声分散时间过长,则由于浆液温度升高使得样品颗粒团聚长大,导致Pt/C电化学催化能下降.在所考察的分散剂中,以乙醇分散制得的催化剂浆液对应的Pt/C电化学面积较大,其相应的氧还原反应活性较高.这可能是由于乙醇的极性和粘度系数小,以及超声过程中浆液温度较低等共同作用所致.

英文摘要：

The influence of the main catalyst ink preparation parameters,such as sonication dispersing time and dispersants,on the electro-chemical performance of 50% Pt/C was studied and discussed.The sonication dispersion time and dispersants have obvious effects on the performance of Pt/C.The optimized sonication dispersion time is 10 min.In the case of sonication dispersion time less than 10 min,the performance is inferior because of the uncompleted dispersion of the electrocatalyst.While in the case of sonication dispersion time more than 10 min,the performance is also poor due to Pt particles agglomeration caused by the temperature increase in the catalyst ink during the sonication dispersion process.The dispersants also significantly affect the activity of Pt/C.When ethanol is adopted as the dispersant,Pt/C possesses a higher electrochemical surface area and exhibits the highest activity for oxygen reduction reaction.This could be attributed to the joint characteristics of low polarization and low viscosity of ethanol.Moreover,the lower temperature of the catalyst ink during the sonication dispersion process using ethanol as the dispersant also contributes to its desirable electrochemical results.