Corgiolu, S.

Ferrara, F.

Mais, L.

Mascia, M.

Palmas, S.

Pettinau, A.

Vacca, A.

S. Palmas

L. Mais

M. Mascia

A. Vacca

S. Corgiolu

F. Ferrara

A. Pettinau

Archivio istituzionale della ricerca - Università di Cagliari

     ON THE ELECTROCHEMICAL REDUCTION OF CO2 AT BORON DOPED DIAMOND ELECTRODES IN AQUEOUS MEDIA  S. Palmas*1, L. Mais1, M. Mascia1, A. Vacca1, S. Corgiolu1, F. Ferrara2, A. Pettinau2  1Università degli studi di Cagliari, Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali,  via Marengo 2, 09123, Cagliari (Italy)  2Sotacarbo S.p.A., c/o Grande Miniera di Serbariu, 09013 Carbonia (Italy) *e-mail: simonetta.palmas@dimcm.unica.it  Keywords: Electrochemical reduction, Carbon dioxide, BDD, bicarbonate solution  The concentration of carbon dioxide in the atmosphere is increased up to 400 mg/l over the last century. This high atmospheric CO2 concentration is related to severe environmental problems, such as global warming; in this context, decreasing the CO2 concentration is a critical issue for a sustainable development. Many efforts have recently been addressed on investigating different pathways to convert carbon dioxide to value-added products and/or through high-energy content fuel [1]. Actually, chemical reduction of carbon dioxide is thermodynamically feasible but only in the presence of strong reducing agents [2]. In alternative, electroreduction of CO2 has been widely studied. Several materials, including metals, semiconductors, metal organic frameworks have been utilized for electrochemical CO2 reduction in recent decades [3].   Conductive boron-doped diamond (BDD) is a material of great interest due to its electrochemical properties, such as wide potential window, low background current, chemical inertness and it has been used for many electrochemical applications. Moreover, the wide potential window and conductive behaviour of BDD electrodes are suitable for supporting CO2 reduction in aqueous media, minimizing hydrogen evolution reactions [4].  In the present work, the electrochemical reduction of CO2 on BDD has been studied in aqueous solution in the presence and in absence of CO2 using bicarbonate solution as electrolyte at different concentration (0.1 M and 0.5 M). Experiments were carried out in a three-electrode cell, in which the working electrode was BDD, while the counter and reference electrodes were a platinum grid and a saturated calomel electrode, respectively. Cyclic voltammograms were recorded in supporting electrolyte and in CO2 saturated solution: several redox peaks were found in the voltammograms carried out at different values of scan rate. The activity of the working electrode was studied in both controlled potential and current electrolyses performed in CO2-saturated electrolyte. Qualitative and quantitative analysis of the liquid products was carried out at the end of electrolysis tests by HPLC, in order to investigate the faradic efficiency and the concentration of the obtained products.  Acknowledgments: Research supported by Fondazione di Sardegna, CRP project F71I17000280002 - 2017   References  [1] S. Ohya, S. Kaneco, H. Katsumata, T. Suzuki, K. Ohta, Catal. Today, 148 (2009) 329. [2] G. Centi, E.A. Quadrelli, S. Perathoner, Energy & Environ. Sci., 6 (2013), 1711. [3] J. Low, J. Tu, W. Ho, J. Phys. Chem. Lett., 6 (2015) 4244. [4] K. Nakata, T. Ozaki, C. Tereshima, A. Fujishima, Y. Einaga, Angew. Chem. Int. Ed., 53 (2014) 871. 

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ON THE ELECTROCHEMICAL REDUCTION OF CO2 AT BORON DOPED DIAMOND ELECTRODES IN AQUEOUS MEDIA

ON THE ELECTROCHEMICAL REDUCTION OF CO2 AT BORON DOPED DIAMOND ELECTRODES IN AQUEOUS MEDIA

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Archivio istituzionale della ricerca - Università di Cagliari