Controllable construction of oxygen vacancies by anaerobic catalytic combustion of dichloromethane over metal oxides for enhanced solar-to-hydrogen conversion

2019 ◽  
Vol 3 (10) ◽  
pp. 2742-2752 ◽  
Author(s):  
Sufen Zhang ◽  
Jianni Liu ◽  
Xiaoyang Dong ◽  
Xiaoxia Jia ◽  
Ziwei Gao ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Catalytic Combustion ◽  
Oxygen Vacancies ◽  
Combustion Method

A facile anaerobic catalytic combustion method is used for controllable oxygen vacancy construction of metal oxides for enhanced solar-to-hydrogen conversion.

Controlled oxygen vacancy engineering on In2O3−x/CeO2−y nanotubes for highly selective and efficient electrocatalytic nitrogen reduction

2020 ◽  
Vol 7 (19) ◽  
pp. 3609-3619
Author(s):  
Zengyao Wang ◽  
Jianfeng Shen ◽  
Wenzhi Fu ◽  
Jiangwen Liao ◽  
Juncai Dong ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Oxygen Vacancies ◽  
Reduction Reaction ◽  
Nitrogen Reduction

Introducing and adjusting the oxygen vacancies (VO) of transition metal oxides has been proposed as a significant and effective way to tackle the sluggish nitrogen reduction reaction (NRR) in the electrocatalysis process.

scholarly journals Facile Strategy for Synthesizing Non-Stoichiometric Monoclinic Structured Tungsten Trioxide (WO3−x) with Plasma Resonance Absorption and Enhanced Photocatalytic Activity

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 553 ◽  
Author(s):  
Shihao Chen ◽  
Yang Xiao ◽  
Wei Xie ◽  
Yinhai Wang ◽  
Zhengfa Hu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Tungsten Trioxide ◽  
Oxygen Vacancies ◽  
Near Infrared ◽  
Treatment Method ◽  
Hydrogen Treatment ◽  
Vacancy Defects ◽  
And Control

Oxygen vacancy defects play an important role in improving the light-capturing and photocatalytic activity of tungsten trioxide (WO3). However, the hydrogen treatment method that is commonly used to introduce oxygen vacancies is expensive and dangerous. Therefore, the introduction and control of oxygen vacancy defects in WO3 remains a challenge. Here, we demonstrated that oxygen vacancies could be successfully introduced into WO3−x while using a facile method through low temperature annealing in alcohol. The obtained WO3−x samples with optimal oxygen vacancies showed strong absorption of light, extending from the ultraviolet to the visible and near-infrared regions, and exhibits strong plasmon resonance from 400–1200 nm peaking at approximately 800 nm. When compared to pristine WO3, the photocatalytic activity of WO3−x was greatly improved in the ultraviolet and visible regions. This study provides a simple and efficient method to generate oxygen vacancies in WO3 for photocatalysis, which may be applied in the photoelectrochemical, electrochromic, and photochromic fields. Because oxygen vacancy is a common characteristic of metal oxides, the findings that are presented herein may be extended to other metal oxides.

scholarly journals Femtosecond visualization of oxygen vacancies in metal oxides

2020 ◽  
Vol 6 (10) ◽  
pp. eaax9427 ◽  
Author(s):  
Xinping Zhang ◽  
Fawei Tang ◽  
Meng Wang ◽  
Wangbin Zhan ◽  
Huaxin Hu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Oxygen Vacancies ◽  
Time Resolved ◽  
Tungsten Oxides ◽  
Structure Of Metal ◽  
Evolution Dynamics ◽  
Spatial Locations

Oxygen vacancies often determine the electronic structure of metal oxides, but existing techniques cannot distinguish the oxygen-vacancy sites in the crystal structure. We report here that time-resolved optical spectroscopy can solve this challenge and determine the spatial locations of oxygen vacancies. Using tungsten oxides as examples, we identified the true oxygen-vacancy sites in WO2.9 and WO2.72, typical derivatives of WO3 and determined their fingerprint optoelectronic features. We find that a metastable band with a three-stage evolution dynamics of the excited states is present in WO2.9 but is absent in WO2.72. By comparison with model bandstructure calculations, this enables determination of the most closely neighbored oxygen-vacancy pairs in the crystal structure of WO2.72, for which two oxygen vacancies are ortho-positioned to a single W atom as a sole configuration among all O─W bonds. These findings verify the existence of preference rules of oxygen vacancies in metal oxides.

Sulfur-doping tuning oxygen vacancies in ultrathin 2D Ni–V mixed metal oxides for exceptional oxidase mimic and antibacterial applications

2021 ◽  
Author(s):  
Yi Wang ◽  
Chao Chen ◽  
Dun Zhang
Keyword(s):  
Antibacterial Activity ◽  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Oxygen Vacancies ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Low Level ◽  
Sulfur Doping

Sulfur-doping ultrathin 2D Ni–V MMO nanosheets can be derived from LDHs. The obtained 2NiV-S-400 with rich oxygen vacancy exhibits the best OXD/POD-like and antibacterial activity by generating of ˙OH and ˙O2− radical with low level of H2O2.

Chemoselective Hydrogenation of Cinnamaldehyde over Tailored Oxygen Vacancy Rich Pd@ZrO2 Catalyst

2021 ◽  
Author(s):  
Komal N. Patil ◽  
Divya Prasad ◽  
Jayesh T. Bhanushali ◽  
Bhalchandra Kakade ◽  
Arvind H. Jadhav ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Selective Hydrogenation ◽  
Oxygen Vacancies ◽  
Synthesis Method ◽  
Chemoselective Hydrogenation ◽  
Zro2 Catalyst ◽  
Industrial Relevance

Selective hydrogenation of cinnamaldehyde to hydrocinnamaldehyde is captivating due to its industrial relevance. Herein, two-step synthesis method was adopted to develop oxygen vacancies in Pd@ZrO2 catalysts. The oxygen vacancies were...

In situ synthesis of Cl-doped Bi2O2CO3 and its enhancement of photocatalytic activity by inducing generation of oxygen vacancies

2020 ◽  
Vol 7 (16) ◽  
pp. 2969-2978
Author(s):  
Jie-hao Li ◽  
Jie Ren ◽  
Ying Liu ◽  
Hui-ying Mu ◽  
Rui-hong Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Ionic Liquids ◽  
Oxygen Vacancy ◽  
Oxygen Vacancies ◽  
In Situ Synthesis ◽  
Photocatalytic Mechanism

Cl-Doped Bi2O2CO3 is prepared using ionic liquids as dopants and the oxygen-vacancy-induced photocatalytic mechanism is revealed.

A hierarchical oxygen vacancy-rich WO3 with “nanowire-array-on-nanosheet-array” structure for highly efficient oxygen evolution reaction

2019 ◽  
Vol 7 (12) ◽  
pp. 6730-6739 ◽  
Author(s):  
Jinxiang Diao ◽  
Wenyu Yuan ◽  
Yu Qiu ◽  
Laifei Cheng ◽  
Xiaohui Guo
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Evolution Reaction ◽  
Oxygen Vacancies ◽  
State Of The Art ◽  
Nanowire Array ◽  
Nanowire Arrays ◽  
Nanosheet Array ◽  
Nanosheet Arrays ◽  
Array Structure ◽  
First Time

Hierarchical vertical WO3 nanowire arrays on vertical WO3 nanosheet arrays with rich oxygen vacancies were synthesized via a simple and facile method, and the outstanding OER performance which is superior to that of most reported state-of-the-art catalysts was reported for the first time.

Facile Removal of Bulk Oxygen Vacancy Defects in Metal Oxides Driven by Hydrogen-Dopant Evaporation

2021 ◽  
pp. 9579-9583
Author(s):  
Min Hu ◽  
Qing Zhu ◽  
Yuan Zhao ◽  
Guozhen Zhang ◽  
Chongwen Zou ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Vacancy Defects ◽  
Bulk Oxygen

Oxygen vacancy induced electron traps in tungsten doped Bi2MoO6 for enhanced photocatalytic performance

CrystEngComm ◽  
2021 ◽  
Author(s):  
Chang Sun ◽  
Zitong Zhao ◽  
Hougang Fan ◽  
Yanli Chen ◽  
Xiaoyan Liu ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Recombination Rate ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Electron Trap ◽  
Electron Traps

As the concentration of the W dopant increased in the Bi2Mo1−xWxO6 nanosheets, the density of the oxygen vacancies became higher, which served as electron trap centers to lower the recombination rate and enhance the photocatalytic performance.

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