Optical and photocatalytic properties of a ZnO@C core/shell sphere with rich oxygen vacancies

We develop a novel method to prepare an oxygen-deficient ZnO@C core/shell based on a traditional hydrothermal reaction, and investigate the role of the carbon core and oxygen vacancies in the photocatalytic activity and photoluminescence processes.

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Controllable preparation of BiFeO3@carbon core/shell nanofibers with enhanced visible photocatalytic activity

Journal of Molecular Catalysis A Chemical ◽

10.1016/j.molcata.2013.04.005 ◽

2013 ◽

Vol 376 ◽

pp. 1-6 ◽

Cited By ~ 32

Author(s):

Yi Liu ◽

Ruzhong Zuo ◽

Shishun Qi

Keyword(s):

Photocatalytic Activity ◽

Core Shell ◽

Carbon Core ◽

Visible Photocatalytic Activity ◽

Controllable Preparation

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Stupendous Photocatalytic Activity of p-BiOI/n-PbTiO3 Heterojunction: The Significant Role of Oxygen Vacancies and Interface Coupling

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.9b05747 ◽

2019 ◽

Vol 123 (35) ◽

pp. 21593-21606 ◽

Cited By ~ 8

Author(s):

Lekha Paramanik ◽

K. Hemalata Reddy ◽

K. M. Parida

Keyword(s):

Photocatalytic Activity ◽

Significant Role ◽

Oxygen Vacancies ◽

Interface Coupling

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Enhancement of Titania Photoanode Performance by Sandwiching Copper between Two Titania Layers

Materials ◽

10.3390/ma13194326 ◽

2020 ◽

Vol 13 (19) ◽

pp. 4326

Author(s):

Fan Yang ◽

Ruizhuang Yang ◽

Lin Yan ◽

Jiankun Wu ◽

Xiaolin Liu ◽

...

Keyword(s):

Photocatalytic Activity ◽

Sandwich Structure ◽

Density Functional ◽

Oxygen Vacancies ◽

Light Response ◽

Density Functional Theory Calculations ◽

Functional Theory ◽

Tio2 Lattice ◽

Novel Method ◽

Cu Dopant

Vacancies in semiconductors can play a versatile role in boosting their photocatalytic activity. In this work, a novel TiO2/Cu/TiO2 sandwich structure is designed and constructed. Abundant vacancies were introduced in TiO2 lattice by Cu reduction under heat treatment. Meanwhile, Cu atom could diffuse into TiO2 to form Cu-doped TiO2. The synergistic effect between oxygen vacancies and Cu atoms achieved about 2.4 times improved photocurrent of TiO2/Cu/TiO2 sandwich structure compared to bare TiO2 thin film. The enhanced photoactivity may be attributed to regulated electron structure of TiO2 by oxygen vacancies and Cu dopant from experimental results and density functional theory calculations. Oxygen vacancies and Cu dopant in TiO2 formed through copper metal reduction can introduce impurity levels and narrow the band gap of TiO2, thus improve the visible light response. More importantly, the Cu2+ and oxygen vacancies in TiO2 lattice can dramatically increase the charge density around conduction band and promote separation of photo-induced charge carriers. Furthermore, the oxygen vacancies on the surface may serve as active site for sufficient chemical reaction. This work presents a novel method to prepare doped metal oxides catalysts with abundant vacancies for improving photocatalytic activity.

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UV photocatalytic activity of Au@ZnO core–shell nanostructure with enhanced UV emission

RSC Advances ◽

10.1039/c5ra11653h ◽

2015 ◽

Vol 5 (80) ◽

pp. 65595-65599 ◽

Cited By ~ 23

Author(s):

Tingting Jiang ◽

Xueying Qin ◽

Ye Sun ◽

Miao Yu

Keyword(s):

Electron Transfer ◽

Photocatalytic Activity ◽

Photocatalytic Properties ◽

Core Shell ◽

Shell Nanostructures ◽

Uv Emission

Au@ZnO core–shell nanostructures with increased ultraviolet photoluminescence emissions present remarkably enhanced ultraviolet photocatalytic properties, based on bidirectional electron transfer between Au and ZnO.

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Reduced graphene oxide coupled CdS/CoFe2O4 ternary nanohybrid with enhanced photocatalytic activity and stability: a potential role of reduced graphene oxide as a visible light responsive photosensitizer

RSC Advances ◽

10.1039/c5ra14889h ◽

2015 ◽

Vol 5 (117) ◽

pp. 96562-96572 ◽

Cited By ~ 41

Author(s):

Simrjit Singh ◽

Neeraj Khare

Keyword(s):

Photocatalytic Activity ◽

Graphene Oxide ◽

Visible Light ◽

Reduced Graphene Oxide ◽

Potential Role ◽

Core Shell ◽

Reduced Graphene

We report the coupling of a CdS/CoFe2O4 core/shell nanorod heterostructure onto 2D platform of reduced graphene oxide (RGO) sheets in which a role of RGO as a visible light responsive photosensitizer is shown for enhanced photocatalytic activity.

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Role of Na+ ion removal on the photocatalytic properties of hydrothermally-prepared nanotubes TiO2

Malaysian Journal of Fundamental and Applied Sciences ◽

10.11113/mjfas.v13n2.617 ◽

2017 ◽

Vol 13 (2) ◽

Author(s):

Naimat Abimbola Eleburuike ◽

Wan Azelee Wan Abu Bakar ◽

Rusmidah Ali

Keyword(s):

Crystal Structure ◽

Photocatalytic Activity ◽

Annealing Temperature ◽

Poor Performance ◽

Sodium Titanate ◽

High Photocatalytic Activity ◽

Photocatalytic Properties ◽

Ion Content ◽

Na Ions

Nanostructured TiO2 enjoys wide patronage for the remediation of water sources that have been contaminated with organic pollutants due to its excellent photocatalytic properties. This study investigated the role of removal of Na+ ions from hydrothermally-prepared TiO2 nanotubes (TNTs) by washing with dilute hydrochloric acid. The photocatalytic activity of TNTs was tested on the degradation of modelled paraquat dichloride-contaminated water. It was found that the amount of residual Na+ ions after acid washing greatly influenced the photocatalytic properties of TNTs. The Na+ ions had significant effect on the crystal structure of TNTs and the crystal structure varied with the annealing temperature. Hence, the effect of the residual Na+ ions was observed at different annealing temperatures of 500, 700 and 800 °C. It was discovered that TNTs containing negligible Na+ ions demonstrated high photocatalytic activity at 500 °C annealing temperature because it consisted of active crystalline anatase species at this temperature. On the other hand, TNTs with high Na+ ion content showed poor performance at 500 °C due to the presence of amorphous sodium titanate species which could result in rapid electron-hole pair recombination. So, it showed highest photocatalytic activity at 800 °C when the crystallinity had increased. Generally, it can be concluded that TNTs with negligible Na+ ion content demonstrated excellent photocatalytic activity by achieving 77.1% degradation of paraquat dichloride compared to those with high Na+ ion content which achieved 61.1% degradation of paraquat dichloride within 5 h.

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Dual tuning of 1 D heteroatoms doped porous carbon nanoarchitectures for supercapacitors: the role of balanced P/N doping and core@shell nano-networks

RSC Advances ◽

10.1039/c5ra27230k ◽

2016 ◽

Vol 6 (11) ◽

pp. 9180-9185 ◽

Cited By ~ 6

Author(s):

Yuanyuan Li ◽

Zhimin Chen ◽

Jianan Zhang ◽

Qun Xu

Keyword(s):

Electrochemical Performance ◽

Porous Carbon ◽

Performance Optimization ◽

Carbon Nanostructures ◽

Core Shell ◽

N Doping ◽

Carbon Core ◽

Co Doped

Intriguing P and N co-doped porous CNT@carbon core@shell nano-networks (PN-CNTs) were facilely synthesized and demonstrated to be ideal carbon nanostructures for electrochemical performance optimization on supercapacitors.

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