Abstract—Environmental pollution caused by increased emission of CO2 is one of the biggest global issues in the 21st century. Among the several other methods to reduce CO2 in the atmosphere, utilization of CO2 by electrocatalytic reduction to get chemical species such as oxalic or formic acid has received a considerable attention at present. Related to this issue, our research team mainly focuses on the synthesis of efficient electrocatalysts to bind and reduce CO2. The work reported herein describes the electrocatalytic reduction of CO2 by (bis(salicylaldehyde)ethylenediamino)Ni(II)([Ni(Salen)]) complex. Cyclic voltametric studies, carried out in DMF using tetraethylhexaflouro phosphate (TEHFP) as the electrolyte, at a glassy carbon electrode revealed that [(Ni2+Salen)/ (Ni+Salen)] reduction takes place at -1.8 V and the reduced form of the [Ni(Salen)] complex is capable of catalyzing CO2 reduction around -1.8 V. The efficiency of the reduction process in terms of i (CO2) / i (N2) ratio is 1.10. The peak-to-peak separation Ep of 200 ± 2 mV is much bigger than the expected value for an electrochemically reversible process (57) mV that involves one electron transfer. The large Ep is an indicative of the involvement of multi-electron reduction process.
Index Terms—Catalytic reduction, nickel complexes, schiff base complexes.
M. C. R. Peiris is with Postgraduate Institute of Science, University of Peradeniya, Sri Lanka (e-mail: email@example.com).
M. Y. Udugala-Ganehenege is with the Department of Chemistry, Faculty of Science, University of Peradeniya, Sri Lanka (e-mail: firstname.lastname@example.org).
Cite: M. C. R. Peiris and M. Y. Udugala-Ganehenege, "Electrocatalytic Activity of (Bis(salicylaldehyde)ethylenediamino)Ni(II) Complex for CO2 Reduction," International Journal of Environmental Science and Development vol. 7, no. 2, pp. 91-94, 2016.