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Studies of surface processes of electrocatalytic reduction of CO_(2) on pt(210), pt(310) and pt(510)

Science China Chemistry 2007年第5期50卷 593-598页

作者： FAN ChunJie FAN YouJun ZHEN ChunHua ZHENG QingWei SUN ShiGang State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Surface processes of CO_(2)reduction on pt(210),pt(310),and pt(510)electrodes were studied by cyclic *** surface structures of these platinum single crystal electrodes were obtained by various treatment *** experimental results illustrated that the electrocatalytic activity of pt single crystal electrodes towards CO_(2)reduction is decreased in an order of pt(210)>pt(310)>pt(510),i.e.,with the decrease of(110)step density on well-defined *** the surfaces were reconstructed due to oxygen adsorption,the catalytic activity of all the three electrodes has been enhanced to a cer-tain *** the activity order remains unchanged,the electrocatalytic activity has been en-hanced more significantly as the density of(110)step sites is more intensive on the pt single crystal *** has revealed that the more open the surface structure is,the more active the pt single crystal electrode will be,and the easier for the electrode to be transformed into a surface structure that exhib-its higher activity under external ***,the relatively ordered surfaces of pt single crystal electrode are comparatively stable under the same external *** present study has gained knowledge on the interaction between CO_(2)and pt single crystal electrode surfaces at a micro-scopic level,and thrown new insight into understanding the surface processes of electrocatalytic re-duction of CO_(2).

关键词： pt single crystal electrode stepped surface CO_(2)electro-catalyticreduction surface processes

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