Photoinduced Defect Engineering: Enhanced Photothermal Catalytic Performance of 2D Black In 2 O 3− x Nanosheets with Bifunctional Oxygen Vacancies

2019 ◽  
Vol 32 (6) ◽  
pp. 1903915 ◽  
Author(s):  
Yuhang Qi ◽  
Lizhu Song ◽  
Shuxin Ouyang ◽  
Xichen Liang ◽  
Shangbo Ning ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Defect Engineering

Oxygen defect engineering in cobalt iron oxide nanosheets for promoted overall water splitting

2019 ◽  
Vol 7 (38) ◽  
pp. 21704-21710 ◽  
Author(s):  
Chengying Guo ◽  
Xuejing Liu ◽  
Lingfeng Gao ◽  
Xiaojing Ma ◽  
Mingzhu Zhao ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Water Splitting ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Oxygen Defect ◽  
Defect Engineering ◽  
Transfer Property ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron

Benefited from the optimized activity of active sites, adsorption energy and the proposed electron transfer property, the CoFe2O4 nanosheet with oxygen vacancies exhibited significantly enhanced water splitting catalytic performance.

scholarly journals The Catalytic Oxidation of Formaldehyde by FeOx-MnO2-CeO2 Catalyst: Effect of Iron Modification

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 555
Author(s):  
Yaxin Dong ◽  
Chenguang Su ◽  
Kai Liu ◽  
Haomeng Wang ◽  
Zheng Zheng ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Active Oxygen ◽  
Molar Ratio ◽  
N2 Adsorption ◽  
Structure Activity ◽  
Iron Modification ◽  
Surface Active ◽  
Catalyst Effect

A series of FeOx-MnO2-CeO2 catalysts were synthesized by the surfactant-templated coprecipitation method and applied for HCHO removal. The influence of Fe/Mn/Ce molar ratio on the catalytic performance was investigated, and the FeOx-MnO2-CeO2 catalyst exhibited excellent catalytic activity, with complete HCHO conversion at low temperatures (40 °C) when the molar ratio of Fe/Mn/Ce was 2/5/5. The catalysts were characterized by N2 adsorption and desorption, XRD, H2-TPR, O2-TPD and XPS techniques to illustrate their structure–activity relationships. The result revealed that the introduction of FeOx into MnO2-CeO2 formed a strong interaction between FeOx-MnO2-CeO2, which facilitated the improved dispersion of MnO2-CeO2, subsequently increasing the surface area and aiding pore development. This promotion effect of Fe enhanced the reducibility and produced abundant surface-active oxygen. In addition, a great number of Oα is beneficial to the intermediate decomposition, whereas the existence of Ce3+ favors the formation of oxygen vacancies on the surface of the catalyst, all of which contributed to HCHO oxidation at low temperatures.

scholarly journals On the Effects of Doping on the Catalytic Performance of (La,Sr)CoO3. A DFT Study of CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 312 ◽  
Author(s):  
Antonella Glisenti ◽  
Andrea Vittadini
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Formation Energy ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Energy Profiles ◽  
High Concentrations ◽  
3D Impurities

The effects of modifying the composition of LaCoO3 on the catalytic activity are predicted by density functional calculations. Partially replacing La by Sr ions has benefical effects, causing a lowering of the formation energy of O vacancies. In contrast to that, doping at the Co site is less effective, as only 3d impurities heavier than Co are able to stabilize vacancies at high concentrations. The comparison of the energy profiles for CO oxidation of undoped and of Ni-, Cu-m and Zn-doped (La,Sr)CoO3(100) surface shows that Cu is most effective. However, the effects are less spectacular than in the SrTiO3 case, due to the different energetics for the formation of oxygen vacancies in the two hosts.

scholarly journals Oxygen Vacancy Enhanced Photoreduction Cr(VI) on Few-Layers BiOBr Nanosheets

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 558 ◽  
Author(s):  
Yin Peng ◽  
Pengfei Kan ◽  
Qian Zhang ◽  
Yinghua Zhou
Keyword(s):  
Oxygen Vacancies ◽  
Surface Defect ◽  
Photocatalytic Performance ◽  
Electrochemical Impedance ◽  
Light Irradiation ◽  
Solvothermal Reaction ◽  
Defect Engineering ◽  
High Concentration ◽  
Solar Light Irradiation ◽  
2D Nanomaterials

2D nanomaterials, with unique structural and electronic features, had been demonstrated as excellent photocatalysts, whose catalytic properties could be tunable with surface defect engineering. In this work, few-layer BiOBr nanosheets with oxygen vacancies (BiOBr-Ov) have been fabricated by a simple solvothermal reaction with the help of ethylene glycol. The obtained BiOBr-Ov exhibited the superior photocatalytic performance with a complete reduction of Cr(VI) (20 mg/L) within 12 min by visible light irradiation. Moreover, Cr(VI) with a high concentration (such as 30 mg/L) only requires 2 min to be photoreduced completely under solar light irradiation. The enhanced photocatalytic performance is contributed to the existence of oxygen vacancies. It has been proved by the results of electrochemical impedance and photocurrent that oxygen vacancies can effectively suppress recombination of photogenerated carriers.

Black TiO2−x with stable surface oxygen vacancies as the support of efficient gold catalysts for water-gas shift reaction

2018 ◽  
Vol 8 (5) ◽  
pp. 1277-1287 ◽  
Author(s):  
Lei Li ◽  
Li Song ◽  
Longfeng Zhu ◽  
Zheng Yan ◽  
Xuebo Cao
Keyword(s):  
Oxygen Vacancies ◽  
Electron Flow ◽  
Catalytic Performance ◽  
Water Gas Shift ◽  
Hot Electron ◽  
Surface Oxygen ◽  
Water Gas Shift Reaction ◽  
Black Tio2 ◽  
Shift Reaction ◽  
Water Gas

H2-etching engineered oxygen vacancies on black TiO2−x to enhance the hot-electron flow and water-gas shift catalytic performance of Au catalysts.

Nano-sized ZrO2 derived from metal–organic frameworks and their catalytic performance for aromatic synthesis from syngas

2019 ◽  
Vol 9 (11) ◽  
pp. 2982-2992 ◽  
Author(s):  
Jingge Liu ◽  
Yurong He ◽  
Linlin Yan ◽  
Ke Li ◽  
Chenghua Zhang ◽  
...  
Keyword(s):  
Surface Properties ◽  
Oxygen Vacancies ◽  
Metal Organic Frameworks ◽  
Catalytic Performance ◽  
Metal Organic

Oxygen vacancies apparently improve the surface properties of nano-sized ZrO2, inducing the promotion of the catalytic performance of nano-sized ZrO2.

Plasma-induced oxygen vacancies in amorphous MnOx boost catalytic performance for electrochemical CO2 reduction

Nano Energy ◽  
2021 ◽  
Vol 79 ◽  
pp. 105492
Author(s):  
Hyunsu Han ◽  
Song Jin ◽  
Seongmin Park ◽  
Yoongon Kim ◽  
Daehee Jang ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Co2 Reduction ◽  
Catalytic Performance ◽  
Electrochemical Co2 Reduction

scholarly journals Removal of VOCs by Ozone: n-Alkane Oxidation under Mild Conditions

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 506
Author(s):  
Alina I. Mytareva ◽  
Igor S. Mashkovsky ◽  
Sergey A. Kanaev ◽  
Dmitriy A. Bokarev ◽  
Galina N. Baeva ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Oxygen Vacancies ◽  
Oxide Catalyst ◽  
Catalytic Performance ◽  
High Concentration ◽  
Volatile Organic ◽  
Negative Effect ◽  
Manganese Oxide Catalyst ◽  
Conventional Solution ◽  
Al2o3 Catalyst

Volatile organic compounds (VOCs) have a negative effect on both humans and the environment; therefore, it is crucial to minimize their emission. The conventional solution is the catalytic oxidation of VOCs by air; however, in some cases this method requires relatively high temperatures. Thus, the oxidation of short-chain alkanes, which demonstrate the lowest reactivity among VOCs, starts at 250–350 °C. This research deals with the ozone catalytic oxidation (OZCO) of alkanes at temperatures as low as 25–200 °C using an alumina-supported manganese oxide catalyst. Our data demonstrate that oxidation can be significantly accelerated in the presence of a small amount of O3. In particular, it was found that n-C4H10 can be readily oxidized by an air/O3 mixture over the Mn/Al2O3 catalyst at temperatures as low as 25 °C. According to the characterization data (SEM-EDX, XRD, H2-TPR, and XPS) the superior catalytic performance of the Mn/Al2O3 catalyst in OZCO stems from a high concentration of Mn2O3 species and oxygen vacancies.

scholarly journals Engineering oxygen vacancies in Na2Ti3O7 for boosting its catalytic performance in MgH2 hydrogen storage

2021 ◽  
Author(s):  
Huanhuan Zhang ◽  
Qianqian Kong ◽  
Song Hu ◽  
Dafeng Zhang ◽  
Haipeng Chen ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Rational Design ◽  
Oxygen Vacancies ◽  
High Efficiency ◽  
Retention Rate ◽  
Storage System ◽  
Critical Role ◽  
Catalytic Performance ◽  
Sorption Kinetics ◽  
Desorption Kinetics

Abstract Rational design of high-efficiency catalysts plays a critical role in improving the hydrogen storage performances of the MgH2. Herein, flower-like Na2Ti3O7 catalyst with rich oxygen vacancies (Na2Ti3O7-Ov) was synthesized from Ti3C2-MXene and demonstrated to remarkably enhance the hydrogen storage of MgH2. Specifically, with an addition of 5 wt.% Na2Ti3O7-Ov, the initial dehydrogenation temperature of the MgH2 + 5Na2Ti3O7-Ov composite reduced substantially from 287 °C (for MgH2) to 183 °C. Moreover, the MgH2 + 5Na2Ti3O7-Ov composite exhibited fast hydrogen ab/desorption kinetics and superb reversible hydrogen storage performance with a retention rate of 90.1 % after 10 cycles attributed to the higher structural stability of Na2Ti3O7-Ov. Both experimental and theoretical results confirm that the oxygen vacancies in Na2Ti3O7-Ov reduce the reaction activation energy during MgH2 dehydrogenation, hence accounting for the excellent hydrogen sorption kinetics. This work would lead to new design and development of advanced defect-based nano-catalysts for the MgH2 hydrogen storage system.

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