Defective BiFeO3 with surface oxygen vacancies: Facile synthesis and mechanism insight into photocatalytic performance

2017 ◽  
Vol 171 ◽  
pp. 24-32 ◽  
Author(s):  
Da Chen ◽  
Feng Niu ◽  
Laishun Qin ◽  
Sen Wang ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Surface Oxygen ◽  
Facile Synthesis ◽  
Insight Into

Relationships of surface oxygen vacancies with photoluminescence and photocatalytic performance of ZnO nanoparticles

2005 ◽  
Vol 48 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Liqiang Jing ◽  
Fulong Yuan ◽  
Haige Hou ◽  
Baifu Xin ◽  
Weimin Cai ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Surface Oxygen

scholarly journals Insight into the Contributions of Surface Oxygen Vacancies on the Promoted Photocatalytic Property of Nanoceria

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1168
Author(s):  
Yuanpei Lan ◽  
Xuewen Xia ◽  
Junqi Li ◽  
Xisong Mao ◽  
Chaoyi Chen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancies ◽  
Separation Efficiency ◽  
Photocatalytic Property ◽  
Pure Hydrogen ◽  
Photogenerated Carrier ◽  
Surface Oxygen ◽  
Photoluminescence Spectra ◽  
Electron Hole ◽  
Insight Into

Oxygen vacancies (OVs) have critical effects on the photoelectric characterizations and photocatalytic activity of nanoceria, but the contributions of surface OVs on the promoted photocatalytic properties are not clear yet. In this work, we synthesized ceria nanopolyhedron (P-CeO2), ceria nanocube (C-CeO2) and ceria nanorod (R-CeO2), respectively, and annealed them at 600 °C in air, 30%, 60% or pure H2. After annealing, the surface OVs concentration of ceria elevates with the rising of H2 concentration. Photocatalytic activity of annealed ceria is promoted with the increasing of surface OVs, the methylene blue photodegradation ratio with pure hydrogen annealed of P-CeO2, C-CeO2 or R-CeO2 is 93.82%, 85.15% and 90.09%, respectively. Band gap of annealed ceria expands first and then tends to narrow slightly with the rising of surface OVs, while the valence band (VB) and conductive band (CB) of annealed ceria changed slightly. Both of photoluminescence spectra and photocurrent results indicate that the separation efficiency of photoinduced electron-hole pairs is significantly enhanced with the increasing of the surface OVs concentration. The notable weakened recombination of photogenerated carrier is suggested to attribute a momentous contribution on the enhanced photocatalytic activity of ceria which contains surface OVs.

Facile synthesis of oxygen-deficient nano-TiO2 coordinated by acetate ligands for enhanced visible-light photocatalytic performance

2020 ◽  
Vol 10 (12) ◽  
pp. 3875-3889 ◽  
Author(s):  
Shaohua Pang ◽  
Yunfei Lu ◽  
Lin Cheng ◽  
Juming Liu ◽  
Huiyan Ma ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Phenol Degradation ◽  
Surface Oxygen ◽  
Facile Synthesis ◽  
Nano Tio2 ◽  
Vacancy Defects ◽  
Surface Oxygen Vacancy ◽  
Visible Light Photocatalytic

Surface oxygen vacancy defects and acetate ligands can synergistically enhance the visible-light photocatalytic activity of nano-TiO2 for phenol degradation.

scholarly journals A High-Efficiency TiO2/ZnO Nano-Film with Surface Oxygen Vacancies for Dye Degradation

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3299
Author(s):  
Huizhong Ma ◽  
Baofei Hao ◽  
Wentao Song ◽  
Jinpeng Guo ◽  
Mingyuan Li ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
High Efficiency ◽  
Dye Degradation ◽  
Charge Carriers ◽  
Surface Oxygen ◽  
Electron Hole ◽  
Surface Separation ◽  
Green Approach ◽  
Compositional Properties

Photocatalytic degradation of organic pollutants in water is a highly efficient and green approach. However, the low quantum efficiency is an intractable obstacle to lower the photocatalytic efficiency of photocatalysts. Herein, the TiO2/ZnO heterojunction thin films combined with surface oxygen vacancies (OVs) were prepared through magnetron sputtering, which was designed to drive rapid bulk and surface separation of charge carriers. The morphology and structural and compositional properties of films were investigated via different techniques such as SEM, XRD, XPS, Raman, AFM, and XPS. It has been found that by controlling the O2/Ar ratio, the surface morphology, thickness, chemical composition, and crystal structure can be regulated, ultimately enhancing the photocatalytic performance of the TiO2/ZnO heterostructures. In addition, the heterojunction thin film showed improved photocatalytic properties compared with the other nano-films when the outer TiO2 layer was prepared at an O2/Ar ratio of 10:35. It degraded 88.0% of Rhodamine B (RhB) in 90 min and 90.8% of RhB in 120 min. This was attributed to the heterojunction interface and surface OVs, which accelerated the separation of electron–hole (e–h) pairs.

Facile synthesis of ZnO/ZnS heterojunction nanoarrays for enhanced piezo-photocatalytic performance

2021 ◽  
pp. 129635
Author(s):  
Zeqian Ren ◽  
Xiu Li ◽  
Lixia Guo ◽  
Jizhou Wu ◽  
Yuqing Li ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Facile Synthesis
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