A5060080104- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Transition Metal Oxide Nanomaterials
- Photochromic and Fluorescence Chemistry
- Gas Sensing Nanomaterials and Sensors
- Advanced Sensor and Energy Harvesting Materials
- Pigment Synthesis and Properties
- ZnO doping and properties
- Quantum Dots Synthesis And Properties
- Analytical Chemistry and Sensors
- Copper-based nanomaterials and applications
- Ga2O3 and related materials
- Electron and X-Ray Spectroscopy Techniques
- Advancements in Battery Materials
- bioluminescence and chemiluminescence research
- Metal and Thin Film Mechanics
- Electrocatalysts for Energy Conversion
- High-Temperature Coating Behaviors
- Advanced Chemical Sensor Technologies
- Advanced oxidation water treatment
- Advanced Thermoelectric Materials and Devices
- Advanced battery technologies research
- Iron oxide chemistry and applications
- Laser-Ablation Synthesis of Nanoparticles
- Perovskite Materials and Applications
Riga Technical University
2018-2024
Materials Science & Engineering
2020
Materials Technologies (United States)
2020
Abstract Water electrolysis remains a key component in the societal transition to green energy. Membrane electrolyzers are state‐of‐the‐art technology for water electrolysis, relying on 80 °C operation highly alkaline electrolytes, which is undesirable many of myriad end‐use cases electrolytic splitting. Herein, an alternative process, decoupled described performed mild acidic conditions with excellent efficiencies. Decoupled sequentially performs oxygen evolution reaction (OER) and hydrogen...
Understanding photochromicity is essential for developing new means of modulating the optical properties and response materials. Here, we report on synthesis exciting photochromic behavior Nb5+ doped TiO2 nanoparticle colloids (NCs). We find that, in hole scavenging media, doping significantly improves time nanoparticles. In infrared regime, Nb-doped NCs exhibit 1 order magnitude faster photoresponse kinetics than pristine TiO2. Enhanced observed visible light regime as well. The...
Tribovoltaic devices are attracting increasing attention as motion-based energy harvesters due to the high local current densities that can be generated. However, while these tribovoltaic being developed, debate remains surrounding their fundamental mechanism. Here, we fabricate thin films from one of world's most common oxides, TiO2, and compare performance under contact with metals varying work functions, areas, applied pressure. The resultant density shows little correlation function...
Detection of volatile organic compounds (VOCs) at room temperature in an ambient environment is highly desired, but still a distant function for gas sensor materials. Here, we are demonstrating photodoping-inspired sensing approach based on thin solid film made ultrasmall (<5 nm) TiO2 nanoparticles. The material has been activated by UV light-generating electrons and holes. In the presence VOCs acting as scavengers photogenerated holes, electrical resistance element significantly decreases...
Polystyrene (PS) is a very common material in packaging. In this study, it recycled by turning into energy harvesting devices: triboelectric generators. Herein, heat‐pressed films of PS are formed and their surfaces modified physically chemically. The properties the determined using dynamic testing machine, performance generators evaluated with high‐speed contact–separation system. developed charge density generator increases two orders magnitude—from 0.03 to 1.52 nC cm −2 —by combining...
Titanium dioxide (TiO2) coatings have a wide range of applications. Anatase exhibits hydrophilic, antimicrobial, and photocatalytic properties for the degradation organic pollutants or water splitting. The main challenge is to obtain durable anatase nanoparticle on plastic substrates by using straightforward approaches. In present study, we revealed preparation transparent TiO2 coating polymethylmethacrylate (PMMA), widely used optical fibres as well other polymer such polypropylene (PP),...
The hematite photo-Fenton catalysis has attracted increasing attention because it offers strong oxidation of organic pollutants under visible light at neutral pH. In the present work, aqueous synthesis catalysts with high activity is demonstrated. We compare for obtained by hydrolyzation 60 °C or a thermally induced transformation from iron-bearing nanoparticles, such as amorphous iron oxyhydroxide goethite. A link between their structure and reactivity established. highest was observed...
Donor dopants in oxide semiconductors are compensated not only by valuable electrons but also other point defects, leading to a decrease electric conductivity and infrared absorption. We demonstrate that the electron compensation mechanism Ga doped ZnO nanocrystals can be promoted photodoping. Unexpectedly, from photodoping stable open air for months.
Gas sensors that detect volatile organic compounds (VOCs) at room temperature are highly attractive for low-power devices and safety. One of the best alternatives to thermal activation is UV-A light, which allows gas sensor room-temperature operation. Here, we demonstrate how doping TiO2 via transition metals (Nb5+, Ta5+ Hf4+) can increase sensing performance UV-activated VOC prepared from these particles. Doping increased response by more than an order magnitude, while time decreased as...
Tribovoltaic devices have emerged as promising technologies for converting mechanical motion to electricity. To maximise the electromechanical conversion of tribovoltaic devices, conventional literature has focussed on engineering a large difference in work-functions between contact materials. However, recent reports suggest that other factors beyond work function play key role conversion. Herein, TiO2 (a cheap, abundant oxide material) is doped with Nb5+, resulting an improved performance...
Abstract Tribovoltaic devices have emerged as promising technologies for converting mechanical motion to electricity via surface charge generation. To maximize the electromechanical conversion of tribovoltaic devices, conventional literature has focussed on engineering a large difference in work functions between contact materials. However, recent reports suggest that other factors beyond function, such temperature, play key role conversion. Herein, TiO 2 (a cheap, abundant oxide material)...
The key parameter for degenerated semiconductor oxide plasmonic nanocrystals is the doping level. Hydrothermal and solvothermal approaches are considered to be less effective toward achieving high concentration of aliovalent donor dopants in a host when compared other synthesis methods that use long chain hydrocarbon solvents, fatty acids, amines as precursors. Because this, although they have several advantages such sustainability, ease use, relatively inexpensive reagents apparatus,...
In this work two different hydrosols were used to impregnate a commercially available cotton fabric with anatase nanoparticles give it photocatalytic activity. To increase the activity, pre-treatment methods applied. The nanoparticle size was determined using dynamic light scattering and x-ray diffraction fabrics examined scanning electron microscopy. Photocatalytic activity measured degradation of methyl-orange while irradiating samples UV light. synthesis method allowed produce an average...
Pašattīroši audumi ir tekstilmateriāli, kuriem piemīt spēja ārēju vides faktoru iedarbībā atbrīvot savu virsmu no dažādiem piesārņojumiem. Šādi ļauj samazināt ūdens un enerģijas patēriņu, kas saistīts ar drēbju mazgāšanu, infekciju risku, pateicoties to biocīdām īpašībām, kā arī pasargā cilvēkus UV starojuma. Papildus tam šādus audumus būtu grūtāk saslapināt; tas mūsdienu mitrajā klimatā samazinātu diskomfortu salijušām drēbēm. Šādus efektus pašattīroši iegūtu tādiem mehānismiem fotokatalīze...