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Electronic Properties of Electron-Deficient Zn(II) Porphyrins for HBr Splitting

1
Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via Luigi Borsari 46, 44121 Ferrara, Italy
2
Institute of Molecular Science and Technologies of the National Research Council (CNR-ISTM), SmartMatLab Centre, via Golgi 19, 20133 Milano, Italy
3
Department of Chemistry, University of Milano, INSTM RU, via Golgi 19, 20133 Milano, Italy
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(13), 2739; https://doi.org/10.3390/app9132739
Received: 11 June 2019 / Revised: 1 July 2019 / Accepted: 3 July 2019 / Published: 6 July 2019
(This article belongs to the Special Issue Advances in Photoelectrodes for Dye-Sensitized Solar Cells)
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Abstract

Two different high potential Zn(II) porphyrin designs carrying either 4 or 5 meso pentafluorophenyl moieties as electron acceptor groups and a further electron withdrawing branch inserted in either the β (1) or meso (2) position were tested in photoelectrosynthetic cells for HBr splitting. Photoaction spectra in the presence of HBr showed that red photons up to 700 nm could be harvested and converted and that 2 performed better than 1, thanks to better electronic properties of the excited state, favored by the insertion of the benzothiadiazole electron withdrawing group. Photoanodic performances in the presence of HBr, however, remained low, due to inefficient regeneration of the oxidized sensitizer as a result of an insufficient driving force for Br oxidation. View Full-Text
Keywords: porphyrins; SnO2; HBr splitting; sensitization porphyrins; SnO2; HBr splitting; sensitization
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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 (CC BY 4.0).

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Berardi, S.; Caramori, S.; Benazzi, E.; Zabini, N.; Niorettini, A.; Orbelli Biroli, A.; Pizzotti, M.; Tessore, F.; Di Carlo, G. Electronic Properties of Electron-Deficient Zn(II) Porphyrins for HBr Splitting. Appl. Sci. 2019, 9, 2739.

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