We prepared submicron-scale spherical hollow particles of anatase TiO2 by using a polystyrene-bead template. The obtained particles were very uniform in size, with a diameter of 490 nm and a shell thickness of 30 nm. The Brunauer-Emmett-Teller surface area measurements revealed a large value of 70 m2/g. The photocatalytic property was investigated by the complete decomposition of gaseous isopropyl alcohol under UV irradiation. It was indicated that the activity of the hollow spheres was 1.8 times higher than that of the conventional P25 TiO2 nanoparticles with a diameter of 30 nm. Furthermore, we fabricated a dye-sensitized solar cell (DSC) using an electrode of the TiO2 hollow spheres, and examined the photovoltaic performance under simulated sunlight. Although the per-area efficiency was rather low (1.26%) because of a low area density of TiO2 on the electrode, the per-weight efficiency was 2.5 times higher than those of the conventional DSCs of TiO2.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/la702157r | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Crafting Hollow Spheres via Bulk Ice Melting with ppb-Level Gas Sensing Performance.
J Am Chem Soc
January 2025
National Center for International Research on Green Optoelectronics, Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
Ice melting, a common yet complex phenomenon, remains incompletely understood. While theoretical studies suggest that preexisting defects in ice generate "off-lattice" water molecules, triggering bulk ice melting, direct experimental evidence of their form has been lacking as the transparent and transient nature of ice poses significant challenges for observation with current techniques. Here, we introduce an ice-melting-induced lyophilization (IMIL) technique that employs graphene-based nanoprobes to replicate and track liquid evolution within melting bulk ice.
View Article and Find Full Text PDFHighly Efficient Schottky Heterojunctions for Photocatalytic Hydrogen Evolution: Facile Synthesis of Hollow Nano-ZnSe Spheres on Ti3C2-Nanosheets.
Chem Asian J
January 2025
Fudan University, Department of Chemistry, 2005# Songhu RD., 200438, Shanghai, CHINA.
Traditional photocatalysts often have limited efficiency due to the high recombination rate of photogenerated electron-hole pairs. In this work, we synthesized 3D/2D ZnSe-MXene heterojunctions by an in situ electrostatic self-assembly method. Notably, the 3% MXene-ZnSe composite exhibited an optimized photocatalytic hydrogen production rate of 765.
View Article and Find Full Text PDFPermanent Nanobubbles in Water: Liquefied Hollow Carbon Spheres Break the Limiting Diffusion Current of Oxygen Reduction Reaction.
J Am Chem Soc
January 2025
Department of Chemistry, Institute for Advanced Materials and Manufacturing, University of Tennessee, Knoxville, Tennessee 37996, United States.
Porous liquids have traditionally been designed with sterically hindered solvents. Alternatively, recent efforts rely on dispersing microporous frameworks in simpler solvents like water. Here we report a unique strategy to construct macroporous water by selectively incorporating hydrophilicity on the surfaces of hydrophobic hollow carbon spheres (HCS).
View Article and Find Full Text PDFOne-step spray pyrolysis synthesis of ZnO/Ag hollow spheres for enhanced visible-light-driven antibacterial applications and wound healing.
Dalton Trans
January 2025
Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Third Hospital of Shanxi Medical University, Tongji Shanxi Hospital, Taiyuan, 030032, China.
Article Synopsis
- ZnO/Ag hollow particles were created using a one-step spray pyrolysis method to improve antibacterial activity and promote wound healing.
- The materials were characterized through techniques like XRD, TEM, and XPS, confirming their hollow structure and even distribution of silver nanoparticles, which enhance light absorption due to their unique properties.
- Antibacterial tests showed that these composites were significantly more effective against bacteria, including MRSA, under visible light, as further analyzed by EPR spectroscopy which indicated the generation of reactive oxygen species contributing to their antibacterial action.
Facile Synthesis of a Pyrovanadate NiVO Hollow Sphere/Reduced Graphene Oxide Nanocomposite as a Solid-State Hybrid Supercapacitor.
ACS Omega
December 2024
Department of Physics, School of Advanced Sciences, Vellore Institute of Technology (VIT) Chennai, Vandalur - Kelambakkam Road, Chennai 600127, India.
Article Synopsis
- Nickel pyrovanadate (NVO) and reduced graphene oxide (rGO) are synthesized together using a solvothermal method, resulting in a crystalline NVO structure and amorphous rGO within the nanocomposite.
- The formation of a hollow nanosphere shape for NVO is observed, which improves surface area and electrochemical stability due to the rGO incorporation.
- The NVO@rGO 20 composite achieves a specific capacitance of 3807 F/g and retains about 70% of its capacitance after 10,000 cycles, making it a promising candidate for high-performance energy storage devices.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!