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Thermal and Photocatalytic Reactions of Methanol and Acetaldehyde on Pt-Modified Brookite TiO <sub/>2</sub> Nanorods
摘要： The influence of adding Pt on the catalytic and photocatalytic activity of monodispersed brookite phase TiO2 (B-TiO2) nanorods (NRs) was investigated. Pt was deposited on the NRs by photo-deposition in solution and the Pt-modified NRs were characterized using XPS, STEM, and LEIS. The thermal and photocatalytic activity of the Pt-modified NRs were then evaluated using temperature-programmed desorption (TPD) in ultra-high vacuum (UHV). It was found that while Pt primarily acted as a site blocker for thermal reactions, Pt also acted as a recombination center for photogenerated electrons and holes, resulting in suppressed photocatalytic activity. Upon pretreatment with O2, however, the Pt-modified NRs exhibited enhanced photoactivity, indicating that adsorbed oxygen prevents electron-hole recombination by reacting with photogenerated conduction band electrons from the B-TiO2 to produce stable superoxide species on the Pt surface deposits. These results clearly demonstrate how the dynamics of charge carriers at the oxide surface may be altered by metal deposits such as Pt, as well as by the presence of adsorbed species on the metal surface.
关键词： brookite,acetaldehyde,photo-oxidation,TiO2,TPD,UHV,methanol,Pt
更新于2025-09-23 15:21:21
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Composite electrode of TiO2 particles with three kinds of crystal phases for significantly improved performance of dye-sensitized solar cells
摘要： A novel composite electrode of TiO2 particles with three kinds of crystal phases is fabricated for improving the dye-sensitized solar cell's performance. The photoelectric conversion efficiency of solar cell with the content of 30 wt% brookite nanocubes and 70 wt% P25 could reach 7.40%. It is obvious that brookite nanocubes are advantageous in terms of reduced charge recombination and higher voltage. On the other hand, P25 gives advantages of high surface area for dye loading and higher charge collection efficiency. This work shows a new photoelectrode design for enhanced energy conversion of DSSCs.
关键词： Composite electrode,Dye-sensitized solar cell,Brookite titania,Photoelectrochemcial property,Photovoltaic conversion efficiency
更新于2025-09-23 15:19:57
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[IEEE 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - Kyoto, Japan (2019.7.2-2019.7.5)] 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - Efficient Planar Perovskite Solar Cells with Entire Low-Temperature Processes via Brookite TiO <sub/>2</sub> Nanoparticle Electron Transport Layer
摘要： Electron transport layer (ETL) is well known as a crucial factor that affects power conversion efficiency (PCE) of perovskite solar cells (PSCs). Low temperature process on ETL has been highly considered for the future of low cost and roll to roll process in mass production of PSCs industrialization. Herein, we demonstrate the low-temperature (<180 oC) processes of pure phase, single crystalline brookite TiO2 nanoparticle (BK TiO2 NPs) layer as an ETL of PSCs, followed by different concentrations of TiCl4 treatment (20mM, 40mM, 60mM and 80mM). By using BK TiO2 NPs with the low temperature process (<180 oC), our device exhibited the highest power conversion efficiency of 15.49% in planar-type PSCs, indicating that the BK TiO2 NPs layer is a new candidate of ETL that can be fabricated in low temperature processes. The optimized TiCl4 concentration is 40mM for the surface treatment of BK TiO2 NPs, which results in the enhancement of PCE, reproducibility and the supression of hysteresis. Probably, the 40mM of TiCl4 treatment improves the interface between the perovskite and BK TiO2 NPs layers and promotes the efficient charge extraction. Thus, the present work is expected to provide an important technology to realize the low-cost planar PSCs produced in entire low-temperature processes.
关键词： electron transport layer,perovskite solar cells,TiCl4 treatment,brookite TiO2 nanoparticles,low-temperature processes
更新于2025-09-11 14:15:04
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Insights into different photocatalytic oxidation activities of anatase, brookite, and rutile single crystal facets
摘要： For the understanding of the activity of TiO2 photocatalysts knowledge of the activities of different crystal facets is necessary. This information can be achieved by the investigation of well-defined single crystalline TiO2 surfaces. In this study, the photocatalytic activity of different anatase, brookite, and rutile single crystal wafers with only one exposed surface has been investigated via the oxidation of methanol and the hydroxylation of terephthalic acid, respectively. XRD and SEM measurements have shown that all surfaces are clearly defined and possess a smooth surface, which allows a reliable comparison of the photocatalytic activities. The investigated anatase surfaces show a higher activity than the rutile surfaces, while the brookite surface is interestingly the least active one. To the best of our knowledge, there are no other reports based on the investigation and comparison of well-defined TiO2 anatase (100), anatase (001), and brookite (100) single crystalline surfaces concerning their photocatalytic activity. Furthermore, the influence of the coordination of the titanium and the oxygen ions on the photocatalytic activity is discussed.
关键词： rutile,terephthalic acid hydroxylation,anatase,TiO2 modifications,photocatalytic methanol oxidation,TiO2 surfaces,brookite,single crystalline surfaces
更新于2025-09-09 09:28:46