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A significant number of molecular catalysts have been developed for electrochemical CO reduction with high efficiency and selectivity; however, testing of these electrocatalysts in an application-ready system is lacking. Here, we present an example of a nonaqueous flow cell electrolyzer with [Ni(cyclam)] as the homogeneous electrocatalyst for CO reduction. Using ferrocene as a sacrificial electron donor and ammonium salts as both electrolyte and proton donor, efficient catalytic CO reduction is achieved. The nonaqueous design shows high selectivity for the reduction of CO to CO (>80%) and achieves high current densities with a graphite felt working electrode (up to 50 mA·cm with 0.5 M proton donor in MeCN solution), producing >40 mL·h of CO. The choice of a molecular electrocatalyst, solvent, and proton donor are the key factors for achieving high activity with an efficient flow electrolyzer and the eventual development of a viable continuous process.
This article was published in the following journal.
Name: Inorganic chemistry
Electrochemical carbon dioxide (CO) reduction, ideally in an aqueous medium, accounts for the sustainable storage of energy from renewable sources in the form of chemical energy in fuels or value-adde...
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