Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Publication date: 5th February 2015
Photoelectrochemical generation of fuels with semiconductor materials offers a versatile strategy to efficiently capture and store the solar energy for the increasing energetic-dependent society. To date, the great development on organic photovoltaic materials has been scarcely explored for solar fuel production due to the gap between the theoretically achievable photocurrent and practical results obtained with Organic Photoelectrochemical Cells (OPEC),and the stability problems in aqueous media under applied bias.[1-3]Herein, we perform a comprehensive study of the energetic aspects of the system that provides the design rules to extract a photocurrent in the scale of mA·cm-2.[4] The selection of the hole and electron selective layer is of paramount importance for the quantitative photocurrent extraction to the electrolyte as well as for the stability of the system. Then, in the present study, the stability of the OPEC in water has been improved by the use of an insoluble cross-linkable PEDOT:PSS layer as hole extracting layer, which avoids delamination of the photocathode, and a thick electron selective layer of TiOx/Pt in contact with the solution that protects the photoactive layer as well as allows the electrically communication between the organic film with the hydrogen evolving catalyst (Pt). The designed device leads to stable 1.6 mmol h-1cm-2 hydrogen generation at 0 V vs RHE during several hours. The obtained results may pave the way towards stable organic photoelectrochemical cells for hydrogen generation.
[1] Lanzarini, E.; Antognazza, M. R.; Biso, M.; Ansaldo, A.; Laudato, L.; Bruno, P.; Metrangolo, P.; Resnati, G.; Ricci, D.; Lanzani G. J. Phys. Chem. C 116, 10944 (2012) [2] Abe, T.; Tobinai, S.; Taira, N.; Chiba, J.; Itoh, T.; Nagai, K. J. Phys. Chem. C 115, 7701 (2011) [3] Bourgeteau, T.; Tondelier, D.; Geffroy, B.; Brisse, R.; Laberty-Robert, C.; Campidelli, S.; de Bettignies, R,; Artero, V.; Palacin, S.; B. Joudusselme Energ. Environ. Sci. 6, 2706 (2013) [4] Guerrero, A.; Haro, M.; Bellani, S.; Antognazza, M. R.; Meda, L.; Gimenez, S.; Bisquert J. Energ. Environ. Sci. 7, 3666 (2014)
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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