Au nanoparticle-doped Co3O4–CoFe2O4@SiO2 as a catalyst for visible-light-driven water oxidation

2018 ◽  
Vol 42 (18) ◽  
pp. 14757-14765 ◽  
Author(s):  
Wenlan Ma ◽  
Hui Li ◽  
Qian Xu ◽  
Yi Zhang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electron Transfer ◽  
Visible Light ◽  
Water Oxidation ◽  
Transfer Rate ◽  
Au Nanoparticle ◽  
Low Dielectric Constant ◽  
Electron Transfer Rate ◽  
Low Dielectric ◽  
Visible Light Driven

Composites of low dielectric constant SiO2, Au and metal oxide was obtained, it showed higher O2 evolution performance due to enhancing the electron transfer rate.

Tuning the Photocatalytic Performance of Plasmonic Nanocomposites (ZnO/Aux) Driven in Visible Light

2019 ◽  
Vol 8 (1) ◽  
pp. 56-61
Author(s):  
Aneeya K. Samantara ◽  
Debasrita Dash ◽  
Dipti L. Bhuyan ◽  
Namita Dalai ◽  
Bijayalaxmi Jena
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Transfer Rate ◽  
Photocatalytic Performance ◽  
Light Exposure ◽  
Au Nanoparticle ◽  
Electron Transfer Rate ◽  
Au Nps ◽  
Zno Nanostructure

: In this article, we explored the possibility of controlling the reactivity of ZnO nanostructures by modifying its surface with gold nanoparticles (Au NPs). By varying the concentration of Au with different wt% (x = 0.01, 0.05, 0.08, 1 and 2), we have synthesized a series of (ZnO/Aux) nanocomposites (NCs). A thorough investigation of the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface has been carried out. It was observed that ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity among all concentrations of Au on the ZnO surface, which degrades the dye concentration within 2 minutes of visible light exposure. It was further revealed that with an increase in the size of plasmonic nanoparticles beyond 0.08%, the accessible surface area of the Au nanoparticle decreases. The photon absorption capacity of Au nanoparticle decreases beyond 0.08% resulting in a decrease in electron transfer rate from Au to ZnO and a decrease of photocatalytic activity. Background: Due to the industrialization process, most of the toxic materials go into the water bodies, affecting the water and our ecological system. The conventional techniques to remove dyes are expensive and inefficient. Recently, heterogeneous semiconductor materials like TiO2 and ZnO have been regarded as potential candidates for the removal of dye from the water system. Objective: To investigate the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface and the effect of the size of Au NPs for photocatalytic performance in the degradation process. Methods: A facile microwave method has been adopted for the synthesis of ZnO nanostructure followed by a reduction of gold salt in the presence of ZnO nanostructure to form the composite. Results: ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity which degrades the dye concentration within 2 minutes of visible light exposure. The schematic mechanism of electron transfer rate was discussed. Conclusion: Raspberry shaped ZnO nanoparticles modified with different percentages of Au NPs showed good photocatalytic behavior in the degradation of dye molecules. The synergetic effect of unique morphology of ZnO and well anchored Au nanostructures plays a crucial role.

Improved quality of electrochemically polymerized luminescent films on Au-nanoparticle modified electrodes: Au-nanoparticle induced interfacial nucleation and fast electron transfer

2017 ◽  
Vol 5 (45) ◽  
pp. 11798-11805 ◽  
Author(s):  
Rong Wang ◽  
Cao Liu ◽  
Xuehong Zhou ◽  
Linlin Liu ◽  
Yuguang Ma
Keyword(s):  
Electron Transfer ◽  
Fast Electron ◽  
Transfer Rate ◽  
Au Nanoparticles ◽  
Modified Electrodes ◽  
Au Nanoparticle ◽  
Electron Transfer Rate ◽  
Luminescent Films

Au-Nanoparticles induced interfacial nucleation and increased the electron-transfer rate of the EP process to improve the quality of EP films.

Effect of electron transfer on the photocatalytic hydrogen evolution efficiency of faceted TiO2/CdSe QDs under visible light

2018 ◽  
Vol 42 (7) ◽  
pp. 4811-4817 ◽  
Author(s):  
Weiwei Chen ◽  
Shan Yu ◽  
Yunqian Zhong ◽  
Xiang-Bing Fan ◽  
Li-Zhu Wu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Transfer Rate ◽  
Electron Transfer Rate ◽  
Cdse Qds ◽  
Photocatalytic Hydrogen Evolution

Higher photocatalytic hydrogen evolution efficiency of {001}-TiO2/CdSe QDs was obtained because of their faster electron transfer rate, compared to that of {101}-TiO2/CdSe QDs.

Heterogeneous Electron Transfer Rate Constants for the Second Reduction Process of Some Dinitroaromatics

1992 ◽  
Vol 57 (7) ◽  
pp. 1410-1418 ◽  
Author(s):  
Mahboob Mohammad ◽  
Athar Yaseen Khan ◽  
Romana Qureshi ◽  
Naila Ashraf ◽  
Waheeda Begum
Keyword(s):  
Dielectric Constant ◽  
Electron Transfer ◽  
Rate Constants ◽  
Transfer Rate ◽  
Anion Radical ◽  
Reduction Process ◽  
Electron Transfer Rate ◽  
Heterogeneous Electron Transfer ◽  
Temperature Dependences

Standard heterogeneous electron transfer rate constants k0 for the second reduction process of 1,2-, 1,3- and 1,4-dinitrobenzenes were evaluated by the Gileadi method. The temperature dependences of k0 were investigated using Marcus' and other expression for ∆G*. However, it was found that to explain the values of k0 and its variation with temperature, it might be prudent to take into consideration the dielectric constant near the site of the reactant (the anion radical) and the product (the dianion).

scholarly journals Short and Long-Range Electron Transfer Compete to Determine Free-Charge Yield in Organic Semiconductors

2021 ◽  
Author(s):  
Joshua Carr ◽  
Taylor Allen ◽  
Bryon W. Larson ◽  
Iryna Davydenko ◽  
Raghunath R Dasari ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electron Transfer ◽  
Long Range ◽  
Organic Semiconductors ◽  
Low Dielectric Constant ◽  
Free Charge ◽  
Low Dielectric ◽  
Frenkel Excitons

Understanding how Frenkel excitons efficiently split to form free-charges in low-dielectric constant organic semiconductors has proven challenging, with many different models proposed in recent years to explain this phenomenon. Here,...

Visible light-driven water oxidation with a subporphyrin sensitizer and a water oxidation catalyst

2016 ◽  
Vol 52 (94) ◽  
pp. 13702-13705 ◽  
Author(s):  
Masanori Yamamoto ◽  
Yusuke Nishizawa ◽  
Pavel Chábera ◽  
Fusheng Li ◽  
Torbjörn Pascher ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Light Absorption ◽  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
Oxidation Catalyst ◽  
Interfacial Electron Transfer ◽  
Visible Light Absorption ◽  
Visible Light Driven

A newly designed contracted porphyrin achieved efficient visible light absorption and interfacial electron transfer for water oxidation in artificial photosynthesis.

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