PtSn/C电极对乙醇的电催化性能研究

利用脉冲电位法在碳纸表面沉积Pt微粒制备了Pt/C催化电极，并在此基础上，采用不同的电化学方法沉积Sn微粒，制备了PtSn/C催化电极。用循环伏安法(CV)测定电催化剂催化氧化乙醇的活性，SEM分析催化电极的表面状态，并用XRD分析催化电极的结晶状况。结果表明：载入Sn后，形成PtSn合金；催化乙醇的活性提高3倍左右；并研究了Sn的电沉积方法和Sn载量的大小对PtSn/C电极催化乙醇的电活性的影响，在一定的铂载量下，采用循环伏安法沉积Sn所制得的PtSn/C(CV)催化电极较恒电位法制得的PtSn/C(CP)电极对乙醇具有更高的催化活性；Pt和Sn的物质的量的比为1∶1（其中载Pt量为202μg/cm²）的PtSn/C(CV)催化电极催化乙醇的活性最高。

Investigation of the electrocatalytic oxidation of ethanol on PtSn/C electrodes

Pt/C electrode has been prepared by depositing Pt micropartical on carbon paper with the pluse poten-tiostatic method. And PtSn/C electrode has been prepared by depositing Sn microparticles on above Pt/C elec-trode with different electrochemistry methods. The catalytic activity toward ethanol have been characterized by cyclic voltammetry testing(CV) ;The surface condition and crystal mode have been analysed by SEM and XRD, respectively. The results indicate that after loading Sn, the Pt and Sn have became aolly, while the catalytic ac-tivity of electrode toward ethanol increases by about 3 times. The influence of methods and capacity of electrode-positing Sn microparticles on the catalytic activity of composite electrode toward ethanol was investigated as well. Compared with PtSn/C composite electrode prepared with constant potential method, the electrocatalytic activity of PtSn/C prepared with cyclic voltammetry method was much higher. The highest catalytic activity of the composite electrode toward ethanol can be obtained when the mole ratio between Pt and Sn is 1 : 1 (the capac-ity of Pt loading is 202μg/cm~2).