Analysis of fuel-cell reactions at well-structured electrodes by using photoelectron spectroscopy combined with an electrochemical cell

为了设计高活性的燃料电池阴极，对吸附在铂(111)、铂(110)和铂(100)单晶电极上的氧物种进行了鉴定和定量。用X射线光电子能谱与电化学电池相结合的方法研究了三种电极的表面氧化过程。结果表明，在ORR过程中，活性铂(110)电极上的游离原子氧增加，而活性较低的铂(111)电极上有氧分子存在。此外，用原位扫描隧道显微镜研究了铂(111)电极在表面氧化/还原循环过程中的形态变化。

Identification and quantification of oxygen species adsorbed on Pt(111), Pt(110) and Pt(100) single-crystal electrodes have been carried out to design highly active cathode for fuel cells. The surface oxidation processes at the three electrodes was explored by using X-ray photoelectron spectroscopy combined with an electrochemical cell. It was demonstrated that dissociated atomic oxygen increased at the active Pt(110) electrode during ORR whereas oxygen molecules were found on the less active Pt(111) electrode. In addition, morphological changes of Pt(111) electrode was clarified during surface oxidation/reduction cycles using in situ scanning tunneling microscopy.