CO_2 Electroreduction Reaction on Pt-Cu Catalyst and Its in-Situ Analysis By Infrared Spectroscopy

摘要

The concentration of CO_2 in the atmosphere continues to increase. As a result, global warming is considered to be progressing due to the greenhouse effect. Therefore, the goal of "achieving a balance between human-made emissions of greenhouse gases and removals by sinks in the second half of this century" is set and decreasing the CO_2 emissions has become an urgent issue. Recently, it was found that the CO_2 electroreduction in an acidic solution on a Pt-based electrode catalyst, such as Pt or PtRu, proceeds at around 0.05 V vs. SHE, which means that CO_2 reduction occur with extremely low overvoltage. Our research group has previously reported that a Pt oxide thin film exhibits a higher CO_2 electroreduction activity than a Pt one, and the factors affecting the superior CO_2 electroreduction activity was considered by Surface-Enhanced Infrared Absorption Spectroscopy (SEIRAS). In this study, CO_2 electroreduction activity of Pt and Pt-Cu electrodes were evaluated and its difference was investigated by in-situ SEIRAS.