Organic molecules as mediators and catalysts for photocatalytic and electrocatalytic CO2 reduction

Yeonji Oh, Xile Hu
Chemical Society Reviews 2013 March 21, 42 (6): 2253-61
Reduction of CO(2) by electrochemical and photoelectrochemical methods to produce carbon-rich fuels is a heavily pursued research theme. Most of the current efforts are focused on the development of transition-metal-based catalysts. In this tutorial review, we present an overview of the development of organic molecules as mediators and catalysts for CO(2) reduction. Four classes of organic molecules are discussed: tetraalkylammonium salts, aromatic esters and nitriles, ionic liquids, and pyridinium derivatives. It is shown that reactions mediated or catalyzed by these organic molecules can be competitive compared to their metal-catalyzed counterparts, both in terms of product selectivity and energy efficiency.

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