Photoelectrochemical CO2 Reduction with a Rhenium Organometallic Redox Mediator at Semiconductor/Aqueous Liquid Junction Interfaces. Issue 46 (18th September 2019)

• Record Type: Journal Article
• Authors: Chae, Sang Youn; Choi, Ja Youn; Kim, Yoolim; Le Tri Nguyen, Dang; Joo, Oh‐Shim
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 46(2019)
• Page Start: 16395
• Page End: 16399
• Publication Date: 2019-09-18
• Subjects: carbon dioxide -- electrochemistry -- interfaces -- rhenium -- solar energy; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201908398
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Electrochemical and photoelectrochemical CO2 reductions were carried out with Re(bh‐bipy)(CO)3 (OH2 ) cocatalysts in aqueous electrolytes. Competition between hydrogen evolution and CO2 reduction was observed under (photo)electrochemical conditions for both glassy carbon and CuInS2 electrodes. The partial current density for CO generation is limited even though the additional potential is applied. However, electrochemical hydrogen evolution was suppressed under photoelectrochemical conditions, and the selectivity and partial current density for CO were considerably increased when compared to the electrochemical reduction in an identical electrode/electrolyte system. This finding may provide insights into using semiconductor/liquid junctions for solar fuel devices to overcome the limitations of electrolysis systems with an external bias. Abstract : On the surface : The selectivity for either hydrogen evolution or CO2 reduction can be controlled by using either electrical energy or photon energy. Competition between hydrogen evolution and CO2 reduction was observed under electrochemical conditions for both glassy carbon and CuInS2 electrodes. However, electrochemical hydrogen evolution was suppressed under photoelectrochemical conditions, showing selectivity for CO2 reduction using an identical electrode/electrolyte system.