| Autor: |
Tasbihi M; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany., Kwon S; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany., Kim B; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany., Brüggemann D; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany., Hou H; Departament de Química, Unitat de Química Inorgànica, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain., Lu J; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany., Amitrano R; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany., Grimm T; ANiMOX GmbH, Max-Planck-Straße 3, 12489 Berlin, Germany., García-Antón J; Departament de Química, Unitat de Química Inorgànica, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain., Strasser P; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany., Riedel SL; Berliner Hochschule für Technik, Department VIII - Mechanical Engineering, Event Technology and Process Engineering, Environmental and Bioprocess Engineering Laboratory, 13353 Berlin, Germany., Schwarze M; Technische Universität Berlin, Department of Chemistry, Straße des 17, Juni 124, 10623 Berlin, Germany. |
| Abstrakt: |
The photocatalytic production of hydrogen using biopolymer-immobilized titanium dioxide (TiO 2 ) is an innovative and sustainable approach to renewable energy generation. TiO 2 , a well-known photocatalyst, benefits from immobilization on biopolymers due to its environmental friendliness, abundance, and biodegradability. In another way, to boost the efficiency of TiO 2 , its surface properties can be modified by incorporating co-catalysts like platinum (Pt) to improve charge separation. In this work, the surface of commercial TiO 2 PC500 was modified with Pt nanoparticles (Pt1%@PC500) and then immobilized on glass surfaces using polyhydroxyalkanoate biopolymer poly(hydroxybutyrate- co -hydroxyhexanoate) (PHBH). The as-prepared immobilized Pt-modified TiO 2 photocatalysts were fully characterized using various physicochemical techniques. The photocatalytic activity of the photocatalyst film was investigated for photocatalytic hydrogen production through water reduction using ethanol as a sacrificial donor. The impact of the film preparation conditions, e.g., PHBH concentration, PHBH:catalyst ratio, and temperature, on activity and stability was studied in detail. The application of biopolymer PHBH as a binder provides a green alternative to conventional immobilization methods, and with the application of PHBH, a stable and active photocatalyst film that showed lower activity compared to that of the suspended photocatalyst but good recyclability in six runs was prepared. A long-term photocatalytic hydrogen production experiment was carried out. In 98 h of operation, 12 mmol of hydrogen was produced in three consecutive runs with a PHBH/Pt1%@PC500 film having an area of ∼5.3 cm 2 . A significantly lower hydrogen productivity was observed after the first run, possibly due to a change in film structure, but thereafter, the productivity remained almost constant for the second and third runs. Hydrogen was the main product in the gas phase (90%), but carbon dioxide (4-5%) and methane (4-5%) were obtained as important byproducts. The byproducts are a consequence of the use of the sacrificial reagent ethanol. The results of the film performance are very promising, with regard to large-scale continuous hydrogen production. |
