Pt、Sn催化剂的电化学制备及催化性能研究

Preparation of Pt、Sn Catalyst by Electrochemical Method and Investigation of Electrocatalytic Performance for Ethanol

采用循环伏安法制备了Pt-Sn/GC电极,并用电化学方法研究了Pt-Sn/GC电极对乙醇的电催化氧化。实验结果表明:乙醇在Pt/GC电极和Pt-Sn/GC电极上均能自发氧化解离,产生强吸附中间体COad,而Sn的加入降低了COad在电极表面的吸附量和覆盖度,抑制了乙醇的自发氧化解离,提高了催化剂的活性;与Pt/GC电极相比,乙醇在Pt-Sn/GC电极上的起始氧化电位负移80mV,正向扫描氧化峰电位负移60mV,电流增大1倍。当沉积量为100r时,Pt-Sn/GC电极对乙醇的电催化活性最高。

Pt -Sn/GC electrode was prepared by cyclic voltammertic method, and electrocatalytic oxidization be- havior of ethanol on Pt - Sn/GC electrode was studied by electrochemical method. Experimental results show that the self - oxidation dissociation phenomenon of ethanol to produce strong adsorption intermediate COad at Pt/GC and Pt - Sn/GC electrodes was found. And with the additive of Sn the adsorption and the coverage of COad on the electrode surface was decreased, the self - oxidation dissociation of ethanol at Pt - Sn/GC electrodes was sup- pressed, and catalytic activity of catalyst was improved. Compared with Pt/GC electrode, the on set oxidation potential of ethanol oxidation at Pt - Sn/GC electrodes was shifted negatively by 80mV, and apex oxidation po- tential was shifted negatively by 60mV too, and the current inreased from 17.56 to 35.28mA/cm2. The catalytic activity of ethanol at Pt - Sn/GC electrode was best when the cyclic times were 100.