Abstract
There is currently quite a lot of scientific interest in carbon dioxide (CO2) capture and valorization with ionic liquids (ILs). In this manuscript, we analyze the influence of the potential applied, the nature of the cathode and the electrolyte using different organic mediators, such as nitro or cyano aromatic derivatives, to promote the electrochemical activation of CO2. An electrocatalytic process using a homogeneous catalysis is seen when nitroderivatives are used, yielding to oxalate in organic electrolytes and ILs. Turnover frequency (TOF) values and Farafay efficiencies were slightly higher in N,N’-dimethylformamide (DMF) than in ILs probably due to the viscosity of the electrolyte. The use of cyano derivatives allows to tune the electrochemical reactivity in function of the reduction potential value applied from electrocarboxylated products (via a nucleophile-electrophile reaction) to oxalate. These electrochemical reactions were also performed using three different cathodes, organic electrolytes and ionic liquids. The use of copper, as a cathode, and ionic liquids, as electrolytes, would be a cheaper and greener alternative for activating carbon dioxide.
Highlights
IntroductionNitrous oxide and carbon dioxide (CO2 ) emissions represents approximately
Nowadays methane, nitrous oxide and carbon dioxide (CO2 ) emissions represents approximately98% of the total greenhouse gas (GHG) inventory worldwide [1,2,3], and their share are expected to increase this twenty-first century
We describe an efficient approach for producing high value products using CO2 as building blocks
Summary
Nitrous oxide and carbon dioxide (CO2 ) emissions represents approximately. 98% of the total greenhouse gas (GHG) inventory worldwide [1,2,3], and their share are expected to increase this twenty-first century. CO2 represents the most important GHG, which represents approximately the 77% of the global GHG emissions (considering its global warming potential) worldwide. The change in atmospheric CO2 concentration has been considered the most important driver of global warming. In 2019 carbon dioxide emissions from energy stagnated at 33 Gt, which are mainly due to anthropogenic activities. It is expected to increase to 40.3 Gt by 2030 and to 50 Gt by 2050, if proper measures are not taken [4,5,6,7]. All the approaches involve a first capture step for an efficient removal of CO2 from common points sources prior to the release of gases into atmosphere [9,10,11,12]
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