Thermally-induced morphological transition in WO deposited on a ZrO2(1 0 0) substrate
摘要:
A combined atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) study of tungsten oxide model catalysts is presented. The model catalysts were prepared by applying the real preparation method to a ZrO2(100) single crystal support. AFM imaged several granular structures of scattered dimensions on the surface of ZrO2(100) in the as prepared samples. After heating, at low loading the tungsten species rearranged into small WOx particles strongly interacting with the substrate. At high tungsten content large WO3 aggregates also formed. XPS analysis confirmed these changes. The estimated surface density of the interacting W-containing species closely matched that of real catalysts. (c) 2007 Elsevier B.V. All rights reserved.
Fluorine‐Induced Surface Metallization for Ammonia Synthesis under Photoexcitation up to 1550 nm
作者:Rong Fu、Zewen Wu、Ziye Pan、Zhuoyang Gao、Zhen Li、Xianghua Kong、Lu Li
DOI:10.1002/anie.202100572
日期:2021.5.10
reduced work function and downward band bending possesses high electron‐donating power to supported Ru species via atomic‐scale ohmic contacts, exhibiting unprecedented photocatalytic performances for ammonia synthesis across the entire solar spectrum region (200–1550 nm) at room temperature. Mechanism and kinetic analysis revealed that the loaded Ru could behave as efficient electron sinks to accumulate
Oxygen vacancies (OVs) have emerged as an important strategy to modulate the electronic structures, conductivity, and catalytic performance of transition metal oxides (TMOs). A few studies reported that OVs could be formed in N-doped TMOs during ammonia treatment. However, the OV-enriched TMOs without N-doping obtained through ammonia treatment are still unreported and their mechanism is unclear. Herein
Activation of CO2 by laser-ablated group 6 metal atoms
作者:Philip F. Souter、Lester Andrews
DOI:10.1039/a700360i
日期:——
The primary reaction products of laser-ablated group 6 atoms with
CO
2
prove to be the insertion products OMCO and
O
2
M(CO)
2
(M = Cr, Mo, W) which are isolated in argon
matrices and identified by the effects of isotopic substitution on their
IR spectra.
事实证明,激光照射的第 6 组原子与 CO 2 的主要反应产物是插入产物 OMCO 和 O 2 M(CO) 2(M = Cr、Mo、W),它们被分离在氩基质中,并通过同位素置换对其红外光谱的影响进行鉴定。
Hexagonal mesocrystals formed by ultra-thin tungsten oxide nanowires and their electrochemical behaviour
Hexagonal mesocrystals formed by tungstenoxide nanowires have been synthesized using a solvothermal method without any template. The selected area electron diffraction (SAED) analysis of the regular hexagonal mesocrystal demonstrates that the nanowires are highly ordered. Electrochemicalbehaviour of the mesocrystals has been evaluated by cyclic voltammograms.
Correlation between thermal and mass spectral techniques for the characterization of allenylidene and carbene complexes
作者:Gehad G. Mohamed、Normen Szesni、Helmut Fischer
DOI:10.1016/j.saa.2007.11.024
日期:2008.11
The fragmentation pathways of allenylidene and carbene complexes have been studied using FAB mass spectrometry in comparison with thermal analyses (TGA, DrTG and DTA). Both the decomposition modes are investigated and the possible fragmentation pathways are suggested. The use of mass and thermal analyses (TGA and DTA) in the analyses of allenylidene and carbene complexes allowed the characterization