Photo-electrochemical sensor for dissolved oxygen sensor, based on a APFO-3:PCBM/palladium oxide hybrid electrode
Maria Rosa Antognazza a, Fabio Di Fonzo a, Sebastiano Bellani a, Ali Ghadirzadeh a, Laura Meda c, Alberto Savoini c, Jorge Louis Morgado d
a IIT - Center for Nanoscience and Technology, Via Giovanni Pascoli n.70/3, Milano, 20311
b Politecnico di Milano, P.zza L. da Vinci 32 20133 Milan- Italy, Italy
c Istituto Eni Donegani, Via Giacomo Fauser n.4, Novara, 28100
d Istituto Sueperior Tecnico, Avenida Rovisco Pais n.1, Lisboa,1049-001
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Roma, Italy, 2015 May 11th - 13th
Organizer: Filippo De Angelis
Poster, Sebastiano Bellani, 305
Publication date: 5th February 2015
This study reports photo-electrochemical activity towards the reduction of dissolved oxygen in aqueous solutions exploiting novel hybrid organic-inorganic systems, based on the coupling of various photoactive conjugated polymers with nanostructured palladium oxide  (PdO) as semiconductor photocathodes. Polymer-based thin films on conductive glass (ITO) clearly showed negative photocurrents depending on the presence of the oxygen in the aqueous solution. Such photo-effect can be related to the excitation by light of the neutral form of the organic materials. Among all investigated pristine materials and blended bulk-heterojunctions, APFO-3:PCBM attained the highest photocathodic currents. In the next step, the alluded blend has been spin-coated in the matrix of hyperbranched nanostructured palladium oxide (PdO), realizing a photo-electrochemical amperometric dissolved oxygen sensors in aqueous solutions. Proper choice of materials and device optimization in parallel with suitable selection of electrochemical parameters resulted in an optimal condition under which linear calibration plots were derived, with R2adj of 0.987 and a sensitivity of -5.87(μA/cm2)/ppm. Analysis at different pH, acid, neutral, and basic was also performed, revealing in all studied cases high reproducible sensing performance, making the possible use of the sensor in various fields of research.
Schematic representation of the energetic levels of the systems and the photocatalytic activity mechanisms
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