权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Spectroelectrochemical Study of High-index Platinum Surfaces with terrace, step and kink sites.

具有平台、台阶和扭结位点的高指数铂表面的光谱电化学研究。

基本信息

批准号：
02640357
负责人：
TAKAHASHI Machiko
金额：
$ 1.34万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640357/
关键词：
single crystal surface infrared spectroscopy electrochemistry Pt terrace site step site surface enhanced Raman scattering metal cluster クラスタ-単結晶 SERS 白金銀

项目摘要

The main purpose of this research is to clarify the nature of the single crystal surface which has different kinds of adsorption sites; i.e. step sites, kink sites and terrace sites. The prominent feature of this work is that all the experimentals were performed in situ condition, i.e. in electrochemical cells, and this is quite important for the elusidation of catalysis and electrochemistry in the atomic-scale point of view.At first, overlayer structures of CO adsorbed on several single crystal surfaces, Pt(111), (110), (100), (11 1 1) and (711), have been investigated by infrared reflection absorption spectroscopy. There exist at least four kinds of adsorption bands of CO on these electrode surfaces, i.e. on-top CO on stepped and terrace atoms, symmetric and asymmetric bridge CO at around 2045, 2060, 1880 and 1910 cm^<-1>, respectively. By changing the applied potental, surface coverages and detection time scale, the characteristic behavior of the band intensities as well as their frequencies of these IR bands were observed.Second theme of this work was the elucidation of detailed mechanism of surface enhanced Raman scattering effect. To enhance the Raman signals of adsorbed species, atomic scale roughness is the determining factor. In this research, the roughness has been known to be the metal clusters consisted of several atoms. The electronic states of the culster must affect the enhancement of SERS.

本研究的主要目的是澄清单晶表面的性质，它具有不同类型的吸附位，即台阶位，扭结位和梯田位。本工作的突出特点是所有的实验都是在原位条件下进行的，即在电化学电池中进行，这对于从原子尺度上研究催化和电化学的洗脱是非常重要的.首先，研究了CO在Pt（111），（110），（100），（1111）和（711）单晶表面上的吸附层结构，采用红外反射吸收光谱法进行了研究。CO在这些电极表面上至少存在四种吸附带，即台阶和平台原子上的顶部CO，对称和不对称桥CO，分别位于2045、2060、1880和1910 cm-2附近<-1>。通过改变外加电位、表面覆盖度和探测时间尺度，观察了这些红外波段的谱带强度和频率的特征行为。本工作的第二个主题是阐明表面增强拉曼散射效应的详细机制。为了增强吸附物种的拉曼信号，原子尺度的粗糙度是决定因素。在本研究中，粗糙度被认为是由多个原子组成的金属团簇。表面增强拉曼光谱的增强效应与晶体的电子态有关。