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

对Pt（111）、Pt（110）和Pt（100）单晶电极上吸附的氧物种进行了鉴定和定量，以设计高活性的燃料电池阴极。用X射线光电子能谱结合电化学池研究了三种电极的表面氧化过程。结果表明，在ORR过程中，在活性Pt（110）电极上解离的原子氧增加，而在活性较低的Pt（111）电极上发现氧分子。此外，利用原位扫描隧道显微镜研究了Pt（111）电极在氧化/还原循环过程中的形貌变化。

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.