Comparison of the photoelectrochemical performance of particulate and nanotube TiO 2 photoanodes
| Autor: | Α. Papaderakis, Eleni Pavlidou, N. Karanasios, Ioannis Poulios, Jenia Georgieva, Sotiris Sotiropoulos, Athanasios Chatzitakis, George Litsardakis |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nanotube
Materials science Anodizing Substrate (chemistry) Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences law.invention Dielectric spectroscopy Magazine Chemical engineering law Electrode Photoelectrolysis 0210 nano-technology Sol-gel |
| Zdroj: | Catalysis Today. 280:14-20 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2016.07.017 |
| Popis: | The aim of this work has been the comparison of the photoelectrocatalytic properties of two types of TiO 2 -based photoanodes. Sol-gel particulate TiO 2 (SGT) layers were grown on Ti substrates (using an iso-propoxide precursor) and TiO 2 nanotubes (TNTs) were formed by appropriate anodization of the same substrate in glycerin solutions. EIS spectroscopy was employed to determine the intrinsic photoelectrocatalytic activity and surface area of the photoanodes. The intrinsic catalytic activity was assessed by the product R ct Q dl (where R ct is the charge transfer resistance). Photovoltammetry experiments showed that the incident photon-to-current efficiency (IPCE) of the TNTs electrodes was 3.5 times higher than that of the SGT ones due to a higher surface area and lower recombination rates. Furthermore, the photoelectrodes were tested against the photoelectrolysis of an antibiotic, where the TNTs showed a 4-fold enhancement in the Chloramphenicol photo-electrolytic degradation rate under +0.5 V reverse bias compared to the SGT. |
| Databáze: | OpenAIRE |
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