ESTABLISHMENT OF NEW RESEARCH SYSTEM TO C OMBINE ELECTROCHEMISTRY ANDELECTRON-SPECTROSCOPY AND THE INVESTIGATIONS OF SURFACE CHEMICAL-STATES OF PT BI-AD ELECTRODE/

A new research system, which allows samples to be transferred rapidly and without contamination between electrochemical environment and ultr a-hight-vacuum chamber, has been set up recently. This system is of in terest to combine investigations on structure and properties of solid surface at both solid/liquid and solid/gas interfaces. The prelimiary study of Pt/Bi-ad electrode at levels of chemical environment and elec tronic structure demonstrated the success of the system established. T ile XPS data indicate that two oxidation states of Bi adatom existe on Pt/Bi-ad electrode surface. The present results give new interpretati on of the promoting mechanism of Bi adatom in electrocatalysis.