硫脲与ClO4^—在银电极上的共吸附

Coadsorption of Thiourea with ClO at Silver Electrodes

硫脲与ＣｌＯ_４~－在银电极上的共吸附乔专虹，吴芸，顾仁敖（苏州大学化学系苏州２１５００６）李五湖，王仲权，田中群（厦门大学化学系固体表面物理化学国家重点实验室厦门３６１００５）ＣｏａｄｓｏｒｐｔｉｏｎｏｆＴｈｉｏｕｒｅａｗｉｔｈＣｌＯａｔＳｉｌｖｅｒ...

Abstract By taking advantage of SERS as a powerfuI toll for analyzing com- plex structure of solid／liquid interfaces at the molecular levels， electrochemical coadsorption systems of thiourea （TU）and ClO has been investegated in de-tail．It has been found the ClO is induced by TU to coadsorbed at the surface，and it only indirectly interacts with the Ag surface，which can be defined as physically induced coadsorption， The SERS results indicate learly that this coadsorption in acidic solutions are stronger than that in the neutural solu-tions， which in mainly due to the protonation at NH_2 group of TU. The time-resolved SERS， electrochemical cyclic voltammetry， potential step， impedence and SEM results assume that there are probahly two different packing struc-tureb for the coadsorbed laver of TU and ariions in the two electrode potential regions. The results also reveal that at the positively charged surfaces a com-pat，coadsorbed layer with relatively high stability is more difficult to build since it may demand reorganization to a higher structural order.