Electrochemical reduction of CO2 at metal-porphyrin supported gas diffusion electrodes under high pressure CO2 |
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| Institution: | 1. Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA;2. Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843-3003, USA;1. Université de Paris, Laboratoire d’Electrochimie Moléculaire, CNRS, F-75006 Paris, France;2. Institut Universitaire de France (IUF), F-75005 Paris, France |
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| Abstract: | Electrochemical reduction of CO2 at metal-meso-tetraphenylporphyrin (TPP) supported gas diffusion electrodes (GDEs) under CO2 at atmospheric pressure and 20 atm was carried out. At Co- and Fe-TPP supported GDEs that are comparatively active in the electrochemical reduction of CO2 under atmospheric CO2, the current efficiencies for the reduction of CO2 increased up to 97.4 and 84.6%, respectively, by an increase in CO2 pressure. At Cu- and Zn-TPP supported GDEs that showed low activity under atmospheric CO2, the current efficiencies for CO2 reduction increased up to 50.5 and 65.8%, respectively, under 20 atm CO2. At these active metal-TPP supported GDEs, the potential of CO2 reduction shifted positively by an increase in CO2 pressure. These results indicate that the increase in concentration of CO2 in the electrolyte solution caused by high pressure enhanced the electrocatalytic activity of metal-TPPs for CO2 reduction. |
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