Catalytic Activity and Electron Structure of Bimetallic Nanoparticles with Sonochemically Designed Inner Structures

采用超声化学法制备了由Au、Pd和Pt中的两种金属组成的双金属纳米粒子，并将其固定在TiO2上，研究了纳米粒子中元素分布与光催化性能的关系。在暗反应中，纳米粒子的结构引起的协同效应更明显。发现具有高功函数的元素如Pt有助于光催化活性的增强，即使量很小。

Bimetallic nanoparticles consisting of two metals among Au, Pd, and Pt were prepared and immobilized on TiO_2 by sonochemical method and the relationship between element distributions in the bimetallic nanoparticles and the (photo) catalytic performances were evaluated. Synergistic effect originated from the structure of nanoparticles was emphasized in dark reaction rather than photocatalysis. It was found that element with high work function such as Pt contributed to enhancement in photocatalytic activities even if the amount was small.