Porous TiO2 thin film-based photocatalytic windows for an enhanced operation of optofluidic microreactors in CO2 conversion
Adrián Angulo-Ibáñez,
Amaia M. Goitandia,
Jonathan Albo,
Estibaliz Aranzabe,
Garikoitz Beobide,
Oscar Castillo,
Sonia Pérez-Yáñez
Affiliations
Adrián Angulo-Ibáñez
Surface Chemistry & Nanotechnologies Unit, Fdn Tekniker, Inaki Goenaga 5, Eibar 20600, Spain
Amaia M. Goitandia
Surface Chemistry & Nanotechnologies Unit, Fdn Tekniker, Inaki Goenaga 5, Eibar 20600, Spain
Jonathan Albo
Department of Chemical & Biomolecular Engineering, University of Cantabria, Avda. Los Castros s/n, 39005 Santander, Spain; Corresponding author
Estibaliz Aranzabe
Surface Chemistry & Nanotechnologies Unit, Fdn Tekniker, Inaki Goenaga 5, Eibar 20600, Spain
Garikoitz Beobide
Departament of Inorganic Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Leioa 48940, Spain; Basque Ctr Mat Applicat & Nanostruct, BCMat, UPV EHU Sci Pk, Leioa 48940, Spain; Corresponding author
Oscar Castillo
Departament of Inorganic Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Leioa 48940, Spain; Basque Ctr Mat Applicat & Nanostruct, BCMat, UPV EHU Sci Pk, Leioa 48940, Spain
Sonia Pérez-Yáñez
Departament of Inorganic Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Leioa 48940, Spain; Basque Ctr Mat Applicat & Nanostruct, BCMat, UPV EHU Sci Pk, Leioa 48940, Spain
Summary: Using a photocatalytic window can simplify the design of an optofluidic microreactor, providing also a more straightforward operation. Therefore, the development of TiO2 coatings on glass substrates seems appealing, although a priori they would imply a reduced accessible area compared with supported nanoparticle systems. Considering this potential drawback, we have developed an endurable photocatalytic window consisting on an inner protective SiO2 layer and an outer mesoporous anatase layer with enhanced surface area and nanoscopic crystallite size (9–16 nm) supported on a glass substrate. The designed photocatalytic windows are active in the CO2-to-methanol photocatalytic transformation, with maximum methanol yield (0.52 μmol·h−1·cm−2) for greatest porosity values and minimum crystallite size. Compared with benchmark supported nanoparticle systems, the nanoscopic thickness of the coatings allowed to save photoactive material using only 11–22 μg·cm−2, while its robustness prevented the leaching of active material, thus avoiding the decay of performance at long working periods.
