Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
The increase of CO2 concentration in atmosphere due to the usage of fossil fuels has caused various enviromental problems. The renewable electricity like solar energy from photovoltaic cells can be used to drive chemical reactions. Resultantly, the electrocatalytic CO2 reduction (CO2RR) has emerged as one of the most promising and sustainable ways to produce renewable fuels and chemicals, and therefore can possibly substitute fossil fuels. Neverthless, condensation processes of CO2 requires high cost and high energy consumption. CO2 capture at low concentrations by catalysts is potentially useful to overcome this problem, but often there is the necessity to introduce additives such as amines or ionic liquids in order to pre-concentrate CO2 as shown by Ishitani et al. in which a Re(I) molecular complex is employied to electroreduce CO2 to CO in presence of TEOA as additive. We investigated the ability of a highly active N-heterocyclic carbene Manganese(I) complex to capture and selectively reduce CO2 at 1%, 10%, 50% concentrations. This catalyst has already shown unprecedent activity for the selective electrocatalytic reduction of CO2 to CO in pure CO2 atmosphere, exceeding 100 turnovers with excellent faradaic yield (nCO=95%) in anhydrous acetonitrile. In our study, this [Mn(I) (CO)3(bis-MeNHC)MeCN]+ proved his capability to reduce selectively CO2 at low concentrations. There are rare examples of earth-abundant 1st row transition metals molecular's complexes that are able to reduce CO2 at low concentrations with no need of additives. Therefore, we have studied the performance of this earth-abundant molecular catalyst extensively at various low concentrations of CO2.
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