The TiO2-ZnO Systems with Multifunctional Applications in Photoactive Processes—Efficient Photocatalyst under UV-LED Light and Electrode Materials in DSSCs

Kubiak, Adam; Żółtowska, Sonia; Bartkowiak, Aleksandra; Gabała, Elżbieta; Sacharczuk, Natalia; Zalas, Maciej; Siwińska-Ciesielczyk, Katarzyna; Jesionowski, Teofil

doi:10.3390/ma14206063

Cited by 15 publications

(4 citation statements)

References 83 publications

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“…The zinc oxide produced was characterized to determine the crystalline structure (X-ray diffraction—XRD), morphology (scanning electron microscopy—SEM, and transmission electron microscopy—TEM), the parameters of the porous structure (low-temperature N 2 sorption), and the thermal stability (thermogravimetric analysis–TGA, and the first derivative of the TGA curve—the DTG curve). A detailed description of the physicochemical analyses carried out is presented elsewhere [ 22 , 26 ].…”

Section: Methodsmentioning

confidence: 99%

The In Situ Hydrothermal and Microwave Syntheses of Zinc Oxides for Functional Cement Composites

et al. 2022

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This study presents the results of research on cement mortars amended with two zinc oxides obtained by two different methods: hydrothermal ZnO-H and microwave ZnO-M. Our work indicates that, in contrast to spherical ZnO-H, ZnO-M was characterized by a columnar particle habit with a BET surface area of 8 m2/g, which was four times higher than that obtained for hydrothermally obtained zinc oxide. In addition, ZnO-M induced much better antimicrobial resistance, which was also reported in cement mortar with this oxide. Both zinc oxides showed very good photocatalytic properties, as demonstrated by the 4-chlorophenol degradation test. The reaction efficiency was high, reaching the level of 90%. However, zinc oxides significantly delayed the cement binder setting: ZnO-H by 430 min and ZnO-M by 380 min. This in turn affected the increments in compressive strength of the produced mortars. No significant change in compressive strength was observed on the first day of setting, while significant changes in the strengths of mortars with both zinc oxides were observed later after 7 and 28 days of hardening. As of these times, the compressive strengths were about 13–15.5% and 12–13% higher than the corresponding values for the reference mortar, respectively, for ZnO-H and ZnO-M. There were no significant changes in plasticity and flexural strength of mortars amended with both zinc oxides.

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Section: Methodsmentioning

confidence: 99%

The In Situ Hydrothermal and Microwave Syntheses of Zinc Oxides for Functional Cement Composites

et al. 2022

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“…Hence, it was proved that the power of the light source used at the photodeposition stage has a key impact on the degradation efficiency of the tested pollutants, in this case, 4-chlorophenol. www.nature.com/scientificreports/ However, it should be noted that an excessive increase in the power of the light source may also have negative effects, which we have described elsewhere 53 . One of the negative effects is, among others the possibility of overheating the sample and thus an increase in evaporation 54 .…”

Section: Optical Propertiesmentioning

confidence: 86%

Insight into the LED-assisted deposition of platinum nanoparticles on the titania surface: understanding the effect of LEDs

Kubiak

Varma

Sikorski

2022

Sci Rep

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This paper proposes a novel LED-assisted deposition of platinum nanoparticles on the titania surface. For the first time, this process was supported by a UV-LED solution. We used two light sources with different wavelengths (λmax = 365 and 395 nm), and power (P = 1, 5, and 10 W) because the photodeposition process based on LEDs has not been defined. The TiO2–Pt material was discovered to be nano-crystalline anatase particles with nano-platinum particles deposited on the surface of titanium dioxide. Furthermore, the luminescence intensity decreased when Pt was added to TiO2, indicating that charge carrier recombination was reduced. The spectra matching of the photocatalyst and LED reactor was performed for the first time in this work. We proposed a convenient LED reactor that focused light in the range of 350–450 nm, allowing us to effectively use photo-oxidative properties of TiO2–Pt materials in the process of removing 4-chlorophenol. In the presented work, the LED light source plays a dual role. They first induce the platinum photodeposition process, before becoming an important component of tailored photoreactors, which is an important innovative aspect of this research.

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“…Various materials have been used to demonstrate resistive switching (RS) behaviors. Among them, ZnO material has been studied extensively and shown to be promising [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. In RRAM design, ZnO has been established as one of the suitable materials for RRAM devices and has been identified as a multifunctional device that exhibits a significant amount of oxygen vacancy (Vo), which helps in the conductive filament (CF) formation [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Statistical Simulation of the Switching Mechanism in ZnO-Based RRAM Devices

et al. 2022

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Resistive random access memory (RRAM) has two distinct processes, the SET and RESET processes, that control the formation and dissolution of conductive filament, respectively. The laws of thermodynamics state that these processes correspond to the lowest possible level of free energy. In an RRAM device, a high operating voltage causes device degradation, such as bends, cracks, or bubble-like patterns. In this work, we developed a statistical simulation of the switching mechanism in a ZnO-based RRAM. The model used field-driven ion migration and temperature effects to design a ZnO-based RRAM dynamic SET and RESET resistance transition process. We observed that heat transport within the conducting filament generated a great deal of heat energy due to the carrier transport of the constituent dielectric material. The model was implemented using the built-in COMSOL Multiphysics software to address heat transfer, electrostatic, and yield RRAM energy. The heat energy increased with the increase in the operating power. Hence, the reliability of a device with high power consumption cannot be assured. We obtained various carrier heat analyses in 2D images and concluded that developing RRAM devices with low operating currents through material and structure optimization is crucial.

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The TiO2-ZnO Systems with Multifunctional Applications in Photoactive Processes—Efficient Photocatalyst under UV-LED Light and Electrode Materials in DSSCs

Cited by 15 publications

References 83 publications

The In Situ Hydrothermal and Microwave Syntheses of Zinc Oxides for Functional Cement Composites

The In Situ Hydrothermal and Microwave Syntheses of Zinc Oxides for Functional Cement Composites

Insight into the LED-assisted deposition of platinum nanoparticles on the titania surface: understanding the effect of LEDs

Statistical Simulation of the Switching Mechanism in ZnO-Based RRAM Devices

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