NDLI: Carbon neutral electrochemical conversion of carbon dioxide mediated by [Mn+(cyclam)Cln] (M = Ni2+ and Co3+) on mercury free electrodes and ionic liquids as reaction media

Content Provider	Royal Society of Chemistry (RSC)
Author	García, M. Arévalo, M. C. Isaacs, M. Quezada, D. Muena, J. P. Honores, J. Aguirre, M. J. Calfumán, K.
Copyright Year	2017
Abstract	In this work, the electrochemical reduction of carbon dioxide using [Mn+(cyclam)Cln] (M = Ni2+ and Co3+) as electrocatalysts has been studied in 1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMImBF4 and BMImNTf2 respectively) ionic liquids as reaction media. Complexes were characterized electrochemically in these salts and relevant parameters, such as a heterogeneous electron transfer rate was calculated. Results indicate a faster M(II)/M(I) redox process in BMImBF4 despite its higher viscosity compared to BMImNTF2. Cyclic voltammetry experiments demonstrated that [Ni(cyclam)Cl2] is the most active macrocycle, towards the reaction under survey. For this compound, potential controlled electrolysis was carried out at−1.4 V vs. Ag/AgCl in BMImBF4 as a solvent, yielding only CO as a reaction product, with a turnover frequency (TOF) of 0.73 h−1. NMR spectra for the ionic liquids, after electrolysis, show that the applied potential does not affect the chemical structure of the salts. FT-IR thin layer spectroelectrochemical experiments in CO2 saturated solution in BMImBF4 at −1.4 V vs. Ag/AgCl show the formation of [Ni(cyclam)CO]+ as precursor species, and also the most stable [Ni(CO)4].
Starting Page	1155
Ending Page	1162
Page Count	8
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	19
Issue Number	4
Journal	Green Chemistry
DOI	10.1039/c6gc02599d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Electrochemistry Carbon dioxide Cyclam Butyl group Tetrafluoroborate Imide Redox Viscosity Cyclic voltammetry Macrocycle Electrolysis Solvent Nuclear magnetic resonance Fourier-transform infrared spectroscopy Nickel tetracarbonyl
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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