The utilization of metal complexes as a catalyst attracts much interest for photochemical hydrogen evolution reaction (HER). In this study, the HER at an ITO electrode modified with a viologen molecular layer and PtCl42- catalyst was investigated by using in situ spectroelectrochemical techniques. It was proven, from the time-resolved absorption spectroscopy coupled with double potential measurement that the electron transfer taken placed between an electrogenerated viologen radical species and proton via PtCl42- catalyst. Furthermore, the detail on kinetics study will be discussed.
Information on molecular and electronic structures of CO/Pt is essential to understand the role of adsorbed CO in catalytic reactions. Compare to extensive work on CO/Pt under ultrahigh vacuum, the electronic structure of CO/Pt in electrochemical environment is less understood due to the difficulty in determining it in solution. Thus, here, double-resonant sum frequency generation spectroscopy, which is a surface-sensitive nonlinear optical technique, was employed to probe potential-dependent electronic and molecular structures of CO/Pt in electrochemical environment.
We have been developing SPM with quartz oscillator. The important feature of the sensors is their high Q-values, which causes high sensitivity to detect the force between the tip and the sample. And the quartz sensors with appropriate configurations are expected to have far better Q-values in solution. But the tip preparation method with a high productivity has not been achieved. we have improved the process of the tip and quartz sensor preparation and the force detection property in solution, and we also applied this SPM to observe surface morphology of human hepatocellular carcinoma cell.