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Journal of Chemistry
Volume 2016 (2016), Article ID 1501728, 7 pages
Research Article

Electrocatalytic Study of Carbon Dioxide Reduction By Co(TPP)Cl Complex

Department of Chemistry, Faculty of Science, University of Hail, Hail, Saudi Arabia

Received 15 November 2015; Accepted 1 December 2015

Academic Editor: Liviu Mitu

Copyright © 2016 Khalaf Alenezi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Carbon dioxide (CO2) is notorious for being a greenhouse gas and is the most important cause of global warming. However, it can be converted into useful products as it is a source of carbon. Reduction of CO2 is therefore an attractive research topic for many chemists. Different methods of electrocatalytic reduction of CO2 have been reported previously. Since CO2 is very stable, the direct electroreduction of CO2 into CO requires high potential at −2.2 V versus Ag/AgCl. In this work, CO2 reduction was carried out by the photoelectrocatalysis of CO2 in the presence of cobalt(III)tetraphenylporphyrin [Co(TPP)Cl] at −1.85 V with a current efficiency of 71%. At illuminated p-type silicon photocathode, the reduction of CO2 into CO was performed at a potential of 300 mV which is positive. However, at the same conditions, potential of −1.55 V with a current efficiency of ca 65% is required for the carbon electrode.