Photo-Induced Charge Transfer on Pt/Bi2WO6 Composite Photocatalysts

2020 ◽  
Vol 20 (3) ◽  
pp. 1838-1844 ◽  
Author(s):  
Dong-Qing He ◽  
Hong-Cheng Liu ◽  
Qi Wang ◽  
Qian Yu ◽  
Jin-Ying Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Separation Efficiency ◽  
Pt Nanoparticles ◽  
Transient Photovoltage ◽  
Composite Photocatalysts ◽  
Induced Charge ◽  
Average Size ◽  
Transfer Properties ◽  
Insight Into

Pt/Bi2WO6 composite photocatalysts were prepared by a facile photoreduction method. Pt nanoparticles with an average size of 5–8 nm were successfully deposited on the surface of Bi2WO6 microspheres and the photocatalytic activity of Bi2WO6 was greatly improved by Pt nanoparticles. The photo-induced charge transfer properties of samples were studied by means of surface photovoltage (SPV) and transient photovoltage (TPV) techniques, giving an insight into the intrinsic reasons of the improvement in photocatalytic activity. The SPV and TPV results revealed that the deposited Pt nanoparticles could trap photo-induced electrons and then largely enhance the separation efficiency of photo-induced charge carriers.

scholarly journals Photocatalytic Reduction of CO2to Methane on Pt/TiO2Nanosheet Porous Film

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Li Qiu-ye ◽  
Zong Lan-lan ◽  
Li Chen ◽  
Cao Yu-hui ◽  
Wang Xiao-dong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Separation Efficiency ◽  
Pt Nanoparticles ◽  
Porous Film ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Porous Films ◽  
Transmission Electron ◽  
Excellent Photocatalytic Activity ◽  
Average Size

Anatase TiO2nanosheet porous films were prepared by calcination of the orthorhombic titanic acid films at 400°C. They showed an excellent photocatalytic activity for CO2photoreduction to methane, which should be related to their special porous structure and large Brunauer-Emmett-Teller (BET) surface area. In order to further improve the photocatalytic activity, Pt nanoparticles were loaded uniformly with the average size of 3-4 nm on TiO2porous films by the photoreduction method. It was found that the loading of Pt expanded the light absorption ability of the porous film and improved the transformation efficiency of CO2to methane. The conversion yield of CO2to methane on Pt/TiO2film reached 20.51 ppm/h·cm2. The Pt/TiO2nanosheet porous film was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and ultraviolet-visible light diffuse reflectance spectra (UV-vis DRS). Moreover, the transient photocurrent-time curves showed that the Pt/TiO2nanosheet porous film exhibited higher photocurrent, indicating that the higher separation efficiency of the photogenerated charge carriers was achieved.

An atomic insight into BiOBr/La2Ti2O7 p–n heterojunctions: interfacial charge transfer pathway and photocatalysis mechanism

2020 ◽  
Vol 10 (3) ◽  
pp. 826-834 ◽  
Author(s):  
Huizhong Wu ◽  
Ruimin Chen ◽  
Hong Wang ◽  
Wen Cui ◽  
Jieyuan Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
No Oxidation ◽  
Interfacial Charge Transfer ◽  
Interfacial Charge ◽  
Insight Into

Mechanisms of the enhancement photocatalytic activity of p–n heterojunction BiOBr/La2Ti2O7 and photocatalytic NO oxidation are proposed.

Study on photogenerated charge transfer properties and enhanced visible-light photocatalytic activity of p-type Bi2O3/n-type ZnO heterojunctions

2015 ◽  
Vol 39 (4) ◽  
pp. 2917-2924 ◽  
Author(s):  
Shasha Yi ◽  
Xinzheng Yue ◽  
Dandan Xu ◽  
Zhipeng Liu ◽  
Fei Zhao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Visible Light ◽  
High Efficiency ◽  
Visible Light Photocatalytic Activity ◽  
Excellent Photocatalytic Activity ◽  
P Type ◽  
Transfer Properties ◽  
Visible Light Photocatalytic

The high-efficiency separation of photo-generated charges provides a catalyst with excellent photocatalytic activity.

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.

scholarly journals Solvothermal-Assisted Synthesis of Biomass Carbon Quantum Dots/Bismuth Oxyiodide Microflower for Enhanced Photocatalytic Activity

NANO ◽  
2018 ◽  
Vol 13 (03) ◽  
pp. 1850031 ◽  
Author(s):  
Xin Yao ◽  
Changchang Ma ◽  
Hai Huang ◽  
Zhi Zhu ◽  
Hongjun Dong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Separation Efficiency ◽  
Carbon Quantum Dots ◽  
Biomass Carbon ◽  
Electron Transfer Mechanism ◽  
Composite Photocatalyst ◽  
Major Activity ◽  
Facile Solvothermal Method ◽  
Insight Into

In this paper, the biomass carbon quantum dots (CQDs) modified flower-like BiOI (CQDs/BiOI) composite photocatalyst was synthesized by a facile solvothermal method. Compared with the pristine BiOI, the biomass CQDs/BiOI exhibited outstanding photocatalytic activity for degradation of the typical methylene blue (MB) under visible light irradiation since the biomass CQDs could act as electron acceptors to effectively facilitate the separation efficiency of photon-generated carriers and prolong their lifetime. Furthermore, the mechanism detection experiment showed that the [Formula: see text] and H[Formula: see text] were major activity species, and the photocatalytic electron transfer mechanism was further investigated. This work provided a new insight into biomass CQDs effects and took an important step toward the development of improving Bi-based semiconductor photocatalyst activity.

Sign in / Sign up

Export Citation Format

Share Document