Photoelectrochemical CO Reduction with a Rhenium Organometallic Redox Mediator at Semiconductor/Aqueous Liquid Junction Interfaces.

Author(s) Chae, S.Youn; Choi, J.Youn; Kim, Y.; Nguyen, D.Le Tri; Joo, O.S.
Journal Angew Chem Int Ed Engl
Date Published 2019 Nov 11

Electrochemical and photoelectrochemical CO reductions were carried out with Re(bh-bipy)(CO) (OH ) cocatalysts in aqueous electrolytes. Competition between hydrogen evolution and CO reduction was observed under (photo)electrochemical conditions for both glassy carbon and CuInS 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.

DOI 10.1002/anie.201908398
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2019;58(46):1639516399.

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