Li-CO2 Electrochemistry: A New Strategy for CO2 Fixation and Energy Storage

Summary Large energy is required for traditional CO 2 fixation, leading to more CO 2 emission and additional pollutants. Recently, integrating renewable energy with CO 2 fixation has attracted increasing attention as a sustainable strategy. Here, based on a systematic investigation on aprotic Li-CO 2 electrochemistry, we first provide an alternative strategy for either CO 2 fixation or energy storage. Both strategies share the same CO 2 reduction process with the formation of Li 2 CO 3 and carbon. Subsequently, CO 2 fixation is achieved through a rechargeable/irreversible oxidation process, during which Li 2 CO 3 is decomposed, while the carbon obtained remains fixed. Moreover, a reversible Li-CO 2 battery system has been realized based on co-oxidization of the resulting carbon and Li 2 CO 3 using a Ru catalyst. Consequently, by shedding light on the fundamental reaction mechanism of aprotic Li-CO 2 electrochemistry, the proof of concept presented here provides strong theoretical underpinning for developing flexible routes for both CO 2 fixation and Li-CO 2 energy storage.

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