Hierarchical growth of ZnO nanorods over SnO2 seed layer: insights into electronic properties from photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2112-2118 ◽  
Author(s):  
Luís F. Da Silva ◽  
Osmando F. Lopes ◽  
Ariadne C. Catto ◽  
Waldir Avansi ◽  
Maria I. B. Bernardi ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Electronic Properties ◽  
Hydrothermal Treatment ◽  
Charge Separation ◽  
Seed Layer ◽  
Photocatalytic Performance ◽  
Zno Nanorods

The ZnO–SnO2 heterojunction catalyst was prepared via a hydrothermal treatment route. The heterojunction exhibited a superior photocatalytic performance in comparison to SnO2 and ZnO, attributed to the good charge separation.

The nanocomposite of polyaniline and nitrogen-doped layered HTiNbO5with excellent visible-light photocatalytic performance

2014 ◽  
Vol 16 (26) ◽  
pp. 13409-13417 ◽  
Author(s):  
Chao Liu ◽  
Liang Wu ◽  
Jing Chen ◽  
Ji-yuan Liang ◽  
Chang-shun Li ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Photocatalytic Performance ◽  
High Efficiency ◽  
Nitrogen Doped ◽  
Visible Light Photocatalytic Activity ◽  
N Doping ◽  
Visible Light Photocatalytic

N-doping and intercalation resulted in a PANI–N-HTiNbO5lamellar nanocomposite, which showed a dramatic enhanced visible-light photocatalytic activity and stability for the degradation of methylene blue (MB), due to the high efficiency of charge separation.

scholarly journals Enhanced Photocatalytic Activity of BiVO4/Bi2S3/SnS2 Heterojunction under Visible Light

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1294
Author(s):  
Sopheak Meng ◽  
Takaya Ogawa ◽  
Hideyuki Okumura ◽  
Keiichi N. Ishihara
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Charge Separation ◽  
Solvothermal Synthesis ◽  
Photocatalytic Performance ◽  
Binding Energies ◽  
X Ray ◽  
Spatial Charge ◽  
Photodegradation Rate

Heterojunction photocatalysts have attracted a significant amount of attention due to their advantages over a single photocatalyst and, particularly, their superior spatial charge separation. Herein, the BiVO4/Bi2S3/SnS2 heterojunction was synthesized via solvothermal synthesis with different ratios of BiVO4 to SnS2. The photodegradation rate of the 0.03 BiVO4/SnS2 sample for rhodamine B removal is 2.3 times or 2.9 times greater than that of a single SnS2 or BiVO4, respectively. The chemical bond between photocatalysts is confirmed by X-ray photoelectron spectroscopy (XPS), and the synchronized shift observed in binding energies strongly indicates the electron screening effect at the heterojunction. A Z-scheme model is proposed to explain charge transfer pathway in the system, in which the formation of Bi2S3 plays a crucial role in the enhanced photocatalytic performance of the heterojunction.

Graphene Decorated with Hierarchical CuS Nanoplates: Enhanced Photocatalytic Performance

NANO ◽  
2018 ◽  
Vol 13 (03) ◽  
pp. 1850029
Author(s):  
Bin Zeng ◽  
Wanfeng Liu ◽  
Wujun Zeng ◽  
Can Jin
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Structural Stability ◽  
Charge Separation ◽  
Photocatalytic Performance ◽  
Microwave Method ◽  
Service Durability ◽  
Solar Photocatalytic Activity ◽  
Photocatalytic Material

Graphene decorated with hierarchical CuS nanoplates (CuS NP-G) was synthesized using a microwave method to be used as a photocatalytic material. The incorporation of graphene into hierarchical CuS nanoplates was confirmed by structural, morphological and optical characterizations. The photocatalytic performance of the nanocomposite was evaluated. This study confirmed that the introduction of graphene was an effective way not only to improve the structural stability and service durability of the composite, but also to improve its solar photocatalytic activity by promoting the electron transfer and charge separation of hierarchical CuS nanoplates.

scholarly journals Annealing Effect of ZnO Seed Layer on Enhancing Photocatalytic Activity of ZnO/TiO2Nanostructure

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Woo-Young Kim ◽  
Soon-Wook Kim ◽  
Dae-Hwang Yoo ◽  
Eui Jung Kim ◽  
Sung Hong Hahn
Keyword(s):  
Photocatalytic Activity ◽  
Seed Layer ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
Flower Structure ◽  
Electron Recombination ◽  
Electron Hole ◽  
Oxygen Defects ◽  
Uv Visible ◽  
Beam Deposition

Zinc oxide (ZnO)/titanium dioxide (TiO2) nanorods have been synthesized via a hydrothermal method for ZnO nanorods and an electron-beam deposition for TiO2nanorods. This work examined the effect of annealing ZnO seed layer on the photocatalytic activity of the ZnO/TiO2nanorods which was determined from photodecomposition of methylene blue under UV irradiation. The photocatalytic activity of the ZnO/TiO2nanorods was improved with increasing annealing temperature of the seed layer from 300°C to 500°C. Annealing the seed layer at 500°C showed the best photocatalytic activity resulting from high UV absorption ability, a large surface area with flower structure and copious oxygen defects which promote separation of electron-hole pairs reducing electron recombination. The prepared nanorods were characterized by field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), photoluminescence (PL), and UV-visible spectroscopy.

Photocatalytic Performance of Bi2O3 Prepared with NH3•H2O under Different pH Value

2012 ◽  
Vol 178-181 ◽  
pp. 641-644 ◽  
Author(s):  
Xi Yang He ◽  
Jian Zhang Li ◽  
Jun Bo Zhong ◽  
Wei Hu
Keyword(s):  
Photocatalytic Activity ◽  
Charge Separation ◽  
Photocatalytic Performance ◽  
Ph Value ◽  
Strong Dependence ◽  
Precipitation Method ◽  
Surface Parameters ◽  
Separation Rate ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

In this paper, parallel flaw precipitation method has been employed to fabricate nanostructured Bi2O3. It is found that the surface parameters, bandgap, the photoinduced charge separation rate and photocatalytic performance of Bi2O3 have a strong dependence on the pH value of precipitation reaction.The prepared photocatalysts were characterized by BET, XRD, UV-Vis diffuse reflectance and surface photovoltage spectroscopy (SPS). The results show that Bi2O3 prepared under pH value10.0 exhibits the best photocatalytic activity among the experimented compositions. The results of further experiments show that surface parameters, bandgap, the photoinduced charge separation rate all play an important role in promotion of photocatalytic activity of Bi2O3 prepared under pH value 10.0.

scholarly journals Enhanced charge separation and increased oxygen vacancies of h-BN/OV-BiOCl for improved visible-light photocatalytic performance

RSC Advances ◽  
2019 ◽  
Vol 9 (25) ◽  
pp. 14286-14295 ◽  
Author(s):  
Wenhui He ◽  
Yawen Wang ◽  
Caimei Fan ◽  
Yunfang Wang ◽  
Xiaochao Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Oxygen Vacancies ◽  
Photocatalytic Performance ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

h-BN/OV-BiOCl composites were prepared to improve the visible-light photocatalytic activity of OV-BiOCl.

Enhanced photocatalytic activity of ZnO nanorods grown on Ga doped seed layer

2015 ◽  
Vol 83 ◽  
pp. 422-430 ◽  
Author(s):  
Amjed Ali ◽  
Xiaoru Zhao ◽  
Aamir Ali ◽  
Libin Duan ◽  
Hongru Niu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Seed Layer ◽  
Zno Nanorods

scholarly journals Roles of cocatalysts in semiconductor-based photocatalytic hydrogen production

2013 ◽  
Vol 371 (1996) ◽  
pp. 20110430 ◽  
Author(s):  
Jinhui Yang ◽  
Hongjian Yan ◽  
Xu Zong ◽  
Fuyu Wen ◽  
Meiying Liu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Composite Material ◽  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Charge Separation ◽  
Reaction Rate ◽  
Photocatalytic Performance ◽  
Photocatalytic Reaction ◽  
Photocatalytic Hydrogen Production ◽  
Reduction And Oxidation

A photocatalyst is defined as a functional composite material with three components: photo-harvester (e.g. semiconductor), reduction cocatalyst (e.g. for hydrogen evolution) and oxidation cocatalyst (e.g. for oxidation evolution from water). Loading cocatalysts on semiconductors is proved to be an effective approach to promote the charge separation and transfer, suppress the charge recombination and enhance the photocatalytic activity. Furthermore, the photocatalytic performance can be significantly improved by loading dual cocatalysts for reduction and oxidation, which could lower the activation energy barriers, respectively, for the two half reactions. A quantum efficiency (QE) as high as 93 per cent at 420 nm for H 2 production has been achieved for Pt–PdS/CdS, where Pt and PdS, respectively, act as reduction and oxidation cocatalysts and CdS as a photo-harvester. The dual cocatalysts work synergistically and enhance the photocatalytic reaction rate, which is determined by the slower one (either reduction or oxidation). This work demonstrates that the cocatalysts, especially the dual cocatalysts for reduction and oxidation, are crucial and even absolutely necessary for achieving high QEs in photocatalytic hydrogen production, as well as in photocatalytic water splitting.

Controlling electronic properties of MoS2/graphene oxide heterojunctions for enhancing photocatalytic performance: the role of oxygen

2018 ◽  
Vol 20 (3) ◽  
pp. 1974-1983 ◽  
Author(s):  
Xiaotian Hua ◽  
Xinguo Ma ◽  
Jisong Hu ◽  
Hua He ◽  
Guowang Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Electronic Properties ◽  
Photocatalytic Performance ◽  
Photocatalytic Efficiency ◽  
Interlayer Interaction ◽  
Theoretical Understanding ◽  
The Relationship

The manipulation of the constituents of novel hetero-photocatalysts is an effective method for improving photocatalytic efficiency, but a theoretical understanding of the relationship between interlayer interaction and photocatalytic activity is still lacking.

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