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Photoelectrochemical CO 2 Reduction with a Rhenium Organometallic Redox Mediator at Semiconductor/Aqueous Liquid Junction Interfaces
Author(s) -
Chae Sang Youn,
Choi Ja Youn,
Kim Yoolim,
Le Tri Nguyen Dang,
Joo OhShim
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201908398
Subject(s) - electrochemistry , electrolyte , glassy carbon , redox , solar fuel , inorganic chemistry , materials science , photoelectrochemistry , photoelectrochemical cell , aqueous solution , electrolysis , electrode , rhenium , semiconductor , hydrogen , chemistry , cyclic voltammetry , photocatalysis , catalysis , optoelectronics , organic chemistry
Abstract Electrochemical and photoelectrochemical CO 2 reductions were carried out with Re(bh‐bipy)(CO) 3 (OH 2 ) cocatalysts in aqueous electrolytes. Competition between hydrogen evolution and CO 2 reduction was observed under (photo)electrochemical conditions for both glassy carbon and CuInS 2 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.