Amine-Functionalized Diamond Electrode for Boosting CO2 Reduction to CO
At a Glance
Section titled âAt a Glanceâ| Metadata | Details |
|---|---|
| Publication Date | 2022-11-01 |
| Journal | ACS Sustainable Chemistry & Engineering |
| Authors | Tatsuhiko Mikami, Takashi Yamamoto, Mai Tomisaki, Yasuaki Einaga |
| Institutions | Keio University |
| Citations | 13 |
Abstract
Section titled âAbstractâCarbon capture, utilization, and storage (CCUS) have been attracting much attention as an initiative to achieve carbon neutrality. In the capture and storage strategy, amines are widely used for highly efficient separation and capturing of CO2 since amines react with CO2 to form carbamates. In the utilization strategy, CO2 electroreduction is a promising method to convert CO2 into value-added compounds because reaction conditions are relatively mild and easily controlled. In this work, toward combining CO2 capture and storage technologies and CO2 electroreduction, we focused on amine modification of the electrode surface, in which boron-doped diamond (BDD) was chosen as a sustainable electrode material. CO2 electroreduction using the amine-modified BDD was performed, and an applied potential dependence of the product selectivity was examined. In situ attenuated total reflectance-infrared measurements showed that the peak intensity of the stretching vibration of the carbonyl group at around 1640 cm-1 decreased as applied potentials became more negative. The effect of amine modification of the BDD surface lies in the formation of a C-N bond during CO2 electroreduction, resulting in the enhancement of the selectivity of CO production up to 8 times compared to the unmodified BDD.