Pt-Sn／Pt电极对乙二醇的电催化氧化  

Electrocatalytic Properties of Electrodes of Sn Dispersed in Pt for Ethylene Glycol Oxidation

作　　者：王国富[1] 刘跃龙[1,2] 丁月敏[1] 饶贵仕[1] 吴志祥[1] 易飞[1] 钟起玲[1] 任斌[3] 田中群[3] 

机构地区：[1]江西师范大学化学化工学院,南昌330022 [2]江西科技师范学院应用化学系,南昌 [3]厦门大学化工学院化学系,固体表面物理化学国家重点实验室,厦门

出　　处：《应用化学》2008年第7期810-814,共5页Chinese Journal of Applied Chemistry

基　　金：厦门大学固体表面物理化学国家重点实验室基金(200511);江西省自然科学基金(0620025)资助项目

摘　　要：采用常规电化学方法研究了Pt/Pt与Pt和Sn配比不同的Pt-Sn/Pt电极对乙二醇(EG)的电催化氧化行为。结果表明,EG在Pt/Pt和Pt-Sn/Pt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,可抑制EG的自发氧化解离,且在一定范围内随着Sn含量的逐渐增加(Sn/Pt从0.25增加至0.67),EG在Pt-Sn/Pt电极上自发氧化解离所产生的CO吸附量逐渐减少,Pt-Sn/Pt电极对EG电催化氧化的活化能逐渐降低(从44.21降至32.11kJ/mol)。与Pt/Pt电极相比,Pt-Sn/Pt(Sn/Pt=0.67)电极对EG电催化氧化的活性得到明显提高。The catalysing activities of Pt/Pt and Pt-Sn/Pt electrodes with different Pt： Sn ratios were investigated with conventional electrochemical technique for ethylene glycol （EG） oxidation. The self-dissociation phenomenon of EG to produce strong adsorption intermediate COad at Pt/Pt and Pt-Sn/Pt electrodes was found for the first time. And with the additive of Sn the self-oxidation dissociation of EG at Pt-Sn/Pt electrodes was suppressed. The adsorption quantity of CO produced by the self oxidation dissociation of EG at Pt-Sn/Pt electrodes decreased with increasing Sn ： Pt ratio （ from 4 ： 1 to 3 ： 2 ）. The apparent activation energy of EG electro-oxidation also decreased（ from 44. 21 to 32. 11 kJ/mol） with increasing Sn-Pt ratio. Compared with Pt/Pt electrode, the onset oxidation potential and apex oxidation potential of EG oxidation shifted negatively by 195 and 105 mV respectively, and the current inreased from 0. 117 1 to 0. 148 1 mA.

关 键 词：Pt-Sn/Pt电极 乙二醇 自发解离 电氧化 

分 类 号：O646[理学—物理化学]