Au/TiO catalysts in different geometrical arrangements were designed to explore the role of morphology and structural properties for the photocatalytic reduction of CO with H O in the gas-phase. The most active sample was a Au@TiO core-shell catalyst with additional Au nanoparticles (NPs) deposited on the outer surface of the TiO shell. CH and CO are the primary carbon-containing products. Large amounts of H are additionally formed by photocatalytic H O splitting. Shell thickness plays a critical role. The highest yields were observed with the thickest layer of TiO , stressing the importance of the semiconductor for the reaction. Commercial TiO with and without Au NPs was less active in the production of CH and CO. The enhanced activation of CO on the core-shell system is concluded to result from electronic interaction between the gold core, the titania shell, and the Au NPs on the outer surface. The improved exposure of Au-TiO interface contributes to the beneficial effect.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/chem.201801796 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Laser Desorption/Ionization on Au@TiO Core@Shell Nanostars for Mass Spectrometric Analysis of Small Molecules.
Nanomaterials (Basel)
December 2024
Department of Chemistry, Dongguk University-Seoul Campus, 30 Pildong-ro 1-gil, Jung-gu, Seoul 04620, Republic of Korea.
The core@shell nanostars composed of star-like Au nanocores with TiO shells (Au@TiO NSs) are synthesized in a one-pot reaction without any reducing or surface-controlling agents. The Au@TiO NSs exhibit strong absorption in the UV region based on the interaction between the Au nanocore and the TiO shell, and this optochemical property leads to the efficient laser desorption/ionization time-of-flight mass spectrometry (LDI-TOF-MS) analysis of small molecules with low background interference and high reproducible mass signals compared with spherical Au nanoparticles (NPs). The limit of detection and dynamic range values of various analytes also improved with Au@TiO NSs compared with those obtained with spherical Au NPs.
View Article and Find Full Text PDFAu@TiO Core-Shell Nanoparticles with Nanometer-Controlled Shell Thickness for Balancing Stability and Field Enhancement in Plasmon-Enhanced Photocatalysis.
ACS Nano
December 2024
Antwerp engineering, photoelectrochemistry and sensing (A-PECS), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp 2020, Belgium.
Plasmonic core-shell nanostructures can make photocatalysis more efficient for several reasons. The shell imparts stability to the nanoparticles, light absorption is expanded, and electron-hole pairs can be separated more effectively, thus reducing recombination losses. The synthesis of metal@TiO core-shell nanoparticles with nanometer control over the shell thickness and understanding its effect on the resulting photocatalytic efficiency still remains challenging.
View Article and Find Full Text PDFLayer-by-Layer Deposition of Hollow TiO Spheres with Enhanced Photoelectric Conversion Efficiency for Dye-Sensitized Solar Cell Applications.
Nanomaterials (Basel)
November 2024
Department of Chemistry, College of Natural Sciences, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea.
Fabricating photoanodes with a strong light-scattering effect can improve the photoconversion efficiency of dye-sensitized solar cells (DSSCs). In this work, a facile microwave hydrothermal process was developed to prepare Au@TiO core-shell nanostructures, and then the Au core was removed by etching, resulting in hollow TiO. Morphological characterizations such as field emission scanning and transmission electron microscopy measurements have been used for the successful formation of core-shell and hollow TiO nanostructures.
View Article and Find Full Text PDFSynthesis and photocatalytic property of Au-TiO nanocomposites with controlled morphologies in microfluidic chips.
Lab Chip
April 2024
Department of Applied Physics, College of Science, Zhejiang University of Technology, Hangzhou, China.
We present an efficient approach for the consecutive synthesis of Au-TiO nanocomposites with controlled morphologies in a microfluidic chip. The seed-mediated growth method was employed to synthesize Au nanorods as the core, and TiO layers of varying thicknesses were deposited on the surface or tip of the Au nanorods. Au-TiO nanocomposites with core-shell, dumbbell, and dandelion-like structures can be precisely synthesized in a one-step manner within the microfluidic chip by finely tuning the flow rate of NaHCO and the amount of hexadecyl trimethyl ammonium bromide.
View Article and Find Full Text PDFA Core-Shell Au@TiO and Multi-Walled Carbon Nanotube-Based Sensor for the Electroanalytical Determination of HO in Human Blood Serum and Saliva.
Biosensors (Basel)
September 2022
MiCRA Biodiagnostics Technology Gateway & Centre of Applied Science for Health, Technological University Dublin (TU Dublin), D24 FKT9 Dublin 24, Ireland.
A hydrogen peroxide (HO) sensor was developed based on core-shell gold@titanium dioxide nanoparticles and multi-walled carbon nanotubes modified glassy carbon electrode (Au@TiO/MWCNTs/GCE). Core-shell Au@TiO material was prepared and characterized using a scanning electron microscopy and energy dispersive X-ray analysis (SEM/EDX), transmission electron microscopy (TEM), atomic force microscopy (AFM), Raman spectroscopy, X-ray diffraction (XRD) and Zeta-potential analyzer. The proposed sensor (Au@TiO/MWCNTs/GCE) was investigated electrochemically using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).
View Article and Find Full Text PDFWant 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!