Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The electrochemical reduction CO2 (CO2RR) is a promising alternative for transforming the surplus electricity from renewable energies into carbon-based fuels or chemicals.1 One of the most studied materials as catalyst for CO2RR has been metallic Cu, given its unique ability to produce hydrocarbons in considerable amounts. Nevertheless, the reaction results in a mixture of products such as H2, CO, CH4 and C2H4. In addition it requires a high overpoetnials which implies important energy loses.2 Therefore the technological viability of this process is contingent on the development of novel, efficient and selective catalyst.
In recent years oxide derived Cu has emerged as a promising material for the selective reduction of CO2 to C2 hydrocarbons such as ethylene.3,4 Usually oxide derived catalyst are prepared by a strong thermal oxidation treatment followed by an electrochemical reduction. Alternatively we have prepared Cu2O nanoparticles as catalyst for this process. Consistent with work on oxidized films, we show that theses nanoparticles exhibit high ethylene selectivity. In addition, we will discuss the role that Cu(I) species can play on the catalytic performance of the oxide derived Cu nanoparticles.
Despite the efforts done on the direct CO2 reduction to hydrocarbons the process still takes place at high overpotential. Therefore a more energy efficient approach is focusing on the two electron reduction to produce CO, which can be used in the production of synthetic fuels via the Fischer-Tropsch process. In this line we will discuss the use heteroatom-doped carbon materias.5 We show that these materials meet and exceed the activity and selectivity of traditional Au catalysts for the production of syngas, offering a cost-effective alternative. Furthermore, we provide evidence that sufficiently strong interaction between CO and the metal enables the protonation of CO to form hydrocarbon.
References
(1) Gattrell, M.; Gupta, N.; Co, A. Ener. Convers. Manag. 007, 48, 1255.
(2) Kortlever, R.; Shen, J.; Schouten, K. J. P.; Calle-Vallejo, F.; Koper, M. T. M. J.Phys. Chem. Lett.2015, 4073.
(3) Li, C. W.; Kanan, M. W. J. Am. Chem. Soc. 2012, 134, 7231.
(4) Kim, D.; Lee, S.; Ocon, J. D.; Jeong, B.; Lee, J. K.; Lee, J. Phys. Chem. Chem. Phys.2015, 17, 824.
(5) Varela, A. S.; Ranjbar Sahraie, N.; Steinberg, J.; Ju, W.; Oh, H.-S.; Strasser, P. Angew. Chem. Int. Ed. 2015, 54, 10758.
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