Green synthesis of nickel species in situ modified hollow microsphere TiO2 with enhanced photocatalytic activity

Wang, Qi; Qin, Zenan; Chen, Jie; Ren, Bin; Chen, Qifeng; Guo, Yanchuan; Cao, Xiaofeng

doi:10.1016/j.apsusc.2015.12.033

Cited by 18 publications

(8 citation statements)

References 45 publications

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“…It is generally accepted that the quantum efficiency of photocatalysis is highly related to the physical properties of TiO 2 such as crystal structure, relative crystallinity, size of the particle, and specific surface area (Xu et al, 2007 ; Lan et al, 2015 ; Wang et al, 2015 , 2016 ; Wen et al, 2015 ; Li et al, 2016 ; Sajan et al, 2016 ; Liang et al, 2017 ; Xia et al, 2017 ; Lin et al, 2018a , b ). Recently, growing interesting has been devoted to the synthesis of TiO 2 nanocrystals with exposed high energy {001} facets by surface fluorination of TiO 2 to reduce the surface energy (Yang et al, 2008 , 2009 ; Chen et al, 2010 ; Yu et al, 2014 ; Sajan et al, 2016 ; Liang et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Oxidation of Acetone Over High Thermally Stable TiO2 Nanosheets With Exposed (001) Facets

Shi

Duan

et al. 2018

Front. Chem.

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Anatase TiO2 (A-TiO2) usually exhibits superior photocatalytic activity than rutile TiO2 (R-TiO2). However, the phase transformation from A-TiO2 to R-TiO2 will inevitably happens when the calcination temperature is up to 600°C, which hampers the practical applications of TiO2 photocatalysis in hyperthermal situations. In this paper, high energy faceted TiO2 nanosheets (TiO2-NSs) with super thermal stability was prepared by calcination of TiOF2 cubes. With increase in the calcination temperature from 300 to 600°C, TiOF2 transforms into TiO2 hollow nanoboxes (TiO2-HNBs) assembly from TiO2-NSs via Ostwald Rippening process. Almost all of the TiO2-HNBs are disassembled into discrete TiO2-NSs when calcination temperature is higher than 700°C. Phase transformation from A-TiO2 to R-TiO2 begins at 1000°C. Only when the calcination temperature is higher than 1200°C can all the TiO2-NSs transforms into R-TiO2. The 500°C-calcined sample (T500) exhibits the highest photoreactivity toward acetone oxidation possibly because of the production of high energy TiO2-NSs with exposed high energy (001) facets and the surface adsorbed fluorine. Surface oxygen vacancy, due to the heat-induced removal of surface adsorbed fluoride ions, is responsible for the high thermal stability of TiO2-NSs which are prepared by calcination of TiOF2 cubes.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Oxidation of Acetone Over High Thermally Stable TiO2 Nanosheets With Exposed (001) Facets

Shi

Duan

et al. 2018

Front. Chem.

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“…Compared to the common hollow nanostructures, hollow CS entities display higher potential in conjoining the properties of each component, namely, prolonged light absorption and reduced photogenerated charge recombination, thus enhancing its PCA . The application of a green template-free approach to synthesize hollow TiO 2 structures in the absence of fluoride-comprising species can improve the PCA …”

Section: Cs Nanophotocatalysts and Their Applicationsmentioning

confidence: 99%

Core–Shell Nanophotocatalysts: Review of Materials and Applications

Shafiee

Rabiee

Ahmadi

et al. 2022

ACS Appl. Nano Mater.

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Hybrid nanostructures and nanoarchitectures possess unique physicochemical properties such as high activity/functionality, enhanced physicochemical stability, and improved biocompatibility, which renders them suitable for various biomedical, pharmaceutical, environmental, and catalytic applications. In this context, core–shell nanophotocatalysts have shown superior activity compared to their counterparts, namely, their individual pristine semiconductors and composite materials components. Thus, the development of various innovative core–shell nanostructures as photocatalysts is of practical relevance in view of their unique properties with salient advantageous features applicable to, among others, the degradation of organic pollutants, energy storage, and H2 generation. Assorted techniques are deployed to synthesize core–shell nanostructures, including chemical vapor deposition, sol–gel, hydrothermal, spin-coating deposition, solvothermal, combustion waves, microwave (MW)- and ultrasonic-assisted, electrodeposition, laser ablation, and biological approaches. Because core–shell nanostructures provide an immense opportunity to have the most efficient photocatalysts with high stability and reproducibility; herein, the recent advances in this domain are discussed, comprising the most important fabrication techniques and diverse appliances including important challenges and unrealized opportunities.

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“…Absorption in the visible light can be achieved through bandgap reduction and through which mobility of the photo‐generated can also be enhanced and thereby recombination can be reduced. Various approaches have been carried out previously to boost the photoactivity of the TiO 2 , like doping with transition metals (Fe, 6 Cu, 7 Ni, 8 Cr 9 ), main group elements (C, 10 N, 11 S, 12 F 13 ), coupling TiO 2 with other narrow bandgap semiconductors (BiVO 4, 14 Cu 2 O, 15 Fe 3 O 4, 16 CoFe 2 O 4 17 ), and anthocyanin/ruthenium (II) phenanthroline complex based dye‐sensitized TiO 2. 18‐21 From the previous works on transition metal doping, the studies have shown that the absorption range of the transition metal doped TiO 2 could be broadened to the visible region, as the dopant ion acts as donor or acceptor states, it advances the exchange and separation of electron‐hole pairs 9 …”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of nickel doped TiO ₂ nanoparticles by green method and its performance as dye‐sensitized solar cells photoanodes

Rajkumar

Ramakrishnan²,

Murugan

et al. 2022

Intl J of Energy Research

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Summary Photoanodes of TiO2 and Nickel (Ni) doped TiO2 nanoparticles (Ni‐TiO2 NPs) were prepared by Bio‐assisted synthesis technique using the extract of grapefruit as solvent/reducing agent. From XRD and Raman analysis the anatase phase of the prepared TiO2 NPs and Ni‐TiO2 NPs were confirmed. The morphology of the prepared NPs was analyzed using FESEM analysis, from the analysis nanorods and spherical shaped structures were observed for TiO2 and Ni‐TiO2, respectively. The optical properties of the synthesized TiO2 and Ni‐TiO2 NPs have been studied by UV‐Vis spectroscopy and the absorption in the visible region was observed for the Ni doped TiO2 samples. Using the prepared TiO2 and Ni‐TiO2 NPs as photo anodes DSSCs were constructed and its performance was examined. In this study, two different kinds of dyes were used as sensitizers such as natural dye and commercial dye (N719). The natural sensitizers are extracted from the murrayakoenigii fruit (MKF) skin. The nickel doped TiO2 nanoparticle showed an efficiency (η) of 2.25% for MKF dye and 5.08% for N719 with 0.05 M of nickel doping.

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Green synthesis of nickel species in situ modified hollow microsphere TiO2 with enhanced photocatalytic activity

Cited by 18 publications

References 45 publications

Photocatalytic Oxidation of Acetone Over High Thermally Stable TiO2 Nanosheets With Exposed (001) Facets

Photocatalytic Oxidation of Acetone Over High Thermally Stable TiO2 Nanosheets With Exposed (001) Facets

Core–Shell Nanophotocatalysts: Review of Materials and Applications

Synthesis and characterization of nickel doped TiO ₂ nanoparticles by green method and its performance as dye‐sensitized solar cells photoanodes

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Green synthesis of nickel species in situ modified hollow microsphere TiO2 with enhanced photocatalytic activity

Cited by 18 publications

References 45 publications

Photocatalytic Oxidation of Acetone Over High Thermally Stable TiO2 Nanosheets With Exposed (001) Facets

Photocatalytic Oxidation of Acetone Over High Thermally Stable TiO2 Nanosheets With Exposed (001) Facets

Core–Shell Nanophotocatalysts: Review of Materials and Applications

Synthesis and characterization of nickel doped TiO 2 nanoparticles by green method and its performance as dye‐sensitized solar cells photoanodes

Contact Info

Product

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About

Synthesis and characterization of nickel doped TiO ₂ nanoparticles by green method and its performance as dye‐sensitized solar cells photoanodes