Ru膜上Pt层的自发沉积及其在电化学表面增强红外光谱中的应用  

Spontaneous Deposition of Pt Overlayer on Ru Film and Its Application in Electrochemical Surface-enhanced IR Absorption Spectroscopy

作　　者：李巧霞[1] 王金意[1] 徐群杰[2] 蔡文斌[1] 

机构地区：[1]复旦大学化学系,上海200433 [2]上海电力学院环境工程系,上海200090

出　　处：《化学学报》2008年第20期2302-2304,共3页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.20673027,20833005);上海市纳米专项(No.0652nm028)资助项目

摘　　要：采用自发沉积法在Ru膜上生成超薄Pt层(简称Ru/Pt膜),即在开路状态下将电化学还原后的Ru膜浸于除去氧的H2PtCl6溶液中进行自发沉积.电化学伏安法测量表明,随着电还原-自发沉积循环次数的增加,该Ru/Pt膜电极所含Pt组分增加,且CO吸附层的电氧化峰电位较Pt膜电极上的明显负移.应用现场衰减全反射表面增强红外光谱法(ATR-SEIRAS)可轻易检测到在该膜电极Pt和Ru位上吸附CO的振动谱峰.所制Ru/Pt膜电极不仅对CO的电催化氧化具有协同效应,还可应用于现场ATR-SEIRAS的研究中.A spontaneous deposition approach was developed to form a Pt ultrathin overlayer onto a Ru nanoparticle film （simplified hereafter as Ru/Pt film） in which the freshly electroreduced Ru film was subsequently immersed in a deaerated H2PtCl6 solution without potential control. Voltammetric measurements indicated that Pt content increased with the number of the reduction-immersion cycles, and CO adlayer could be electro-oxidized at a much lower potential on the Ru/Pt film electrode than on a Pt film electrode. With in situ attenuated-total-reflection surface-enhanced IR absorption spectroscopy （ATR-SEIRAS）, CO molecules adsorbed on both Pt and Ru sites of the Ru/Pt film electrode could be easily identified. In addition to a synergetic effect towards the electrocatalytic oxidation of CO, this as-deposited Ru/Pt film can be applicable to in situ ATR-SEIRAS measurements.

关 键 词：Ru基Pt层电极 自发沉积法 电催化 CO 衰减全反射表面增强红外光谱 

分 类 号：TM911.4[电气工程—电力电子与电力传动]