用动电位扫描法研究Pt/TiO_2上的氢溢流和反溢流  

STUDY OF HYDROGEN SPILLOVER AND BACK SPILLOVER ON Pt/TiO_2 BY POTENTIAL DYNAMIC SWEEP METHOD

作　　者：林化新[1] 

机构地区：[1]中国科学院大连化学物理研究所,大连116011

出　　处：《Chinese Journal of Catalysis》1991年第3期187-192,共6页催化学报（英文）

摘　　要：用动电位扫描法研究了Pt/TiO_2上氢溢流和反溢流。TiO_2,Pt和Pt/TiO_2的阴极停留后单扫描和连续扫描分别表现出来的不同行为,表明了TiO_2担Pt后发生了明显的氢溢流和反溢流作用。因而担载在TiO_2上的Pt便成为活性氢进出TiO_2晶体的“门户”。随着Pt/TiO_2氢后处理温度逐步升高,其氢溢流和反溢流作用逐步减弱,而氢电化学吸附(或脱附)作用则相应地逐步增强,到某一程度,其氢电极过程的控制步骤由氢扩散转变为氢电化学吸附(或脱附)。在一定范围内,TiO_2上的担Pt量的增加可导致Pt/TiO_2上氢溢流和反溢流作用的增强。Hydrogen spillover and back spillover on Pt/TiO2 catalysts have been studied by the potential dynamic sweep method. The behavior of Pt/TiO2 in the first anodic scanning after cathodic stay and continuous scanning is notably different from that of TiO2 and Pt. This fact demonstrates that the hydrogen spillover and back spillover are surely present on Pt/TiO2 catalysts. Pt is the 'gate' for the active hydrogen passing in and moving out of TiO2 crystal lattice. The catalytic role of Pt/TiO2 in hydrogen spillover and back spillover decreases and the electrochemical hydrogen adsorption (or desorption) on Pt/TiO2 increases with increasing the temperature of H2 treatment, to a certain extent, the control step of hydrogen electrode process is changed from hydrogen diffusion to electrochemical hydrogen adsorption (or desorption).The increase of the amount of Pt supported on TiO2 enhances the hydrogen spillover and back spillover on Pt/TiO2.

关 键 词：Pt/TiO2x 催化剂 氢溢流 反溢流 

分 类 号：O643.36[理学—物理化学]