Ultra-small yellow defective TiO2 nanoparticles for co-catalyst free photocatalytic hydrogen production

Wu, Qingping; Huang, Feng; Zhao, Mingshi; Xu, Jü; Zhou, Jiangcong; Wang, Yuansheng

doi:10.1016/j.nanoen.2016.04.004

Cited by 136 publications

(78 citation statements)

References 46 publications

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“…Previous results proved that O vacancy has a significant effect on the photocatalytic activity of TiO 2 . We believe that the position of O vacancy in TiO 2 could influence the NO adsorption, light absorption, charge generation, and separation as well as carrier transport, thus determining the overall photocatalytic NO removal activity.…”

Section: Resultsmentioning

confidence: 81%

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO₂

Shen

Dong

Wang

et al. 2019

Adv Materials Inter

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Although defects play an important role in the photocatalytic activity of TiO2, the mechanism of the photocatalytic activity related to different defects remains disputable. Moreover, the reported methods to introduce defects raise the preparation cost. In this work, different types of defects including O‐vacancy cluster, surface O‐vacancy, and bulk O‐vacancy defects are in situ introduced in TiO2 by controlling the crystallization temperature. The medium‐degree crystallinity TiO2 sample mainly containing surface O‐vacancies exhibits the best NO removal activity. The systematic study of photocatalytic mechanism demonstrates that the surface O‐vacancies significantly promote the adsorption of H2O molecules and improve charge transfer to the adsorbed H2O forming ·OH, thus dramatically enhancing the photocatalytic NO removal activity. On the contrary, bulk O‐vacancies neither help the adsorption of H2O molecules, nor improve the charge transfer to H2O.

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Section: Resultsmentioning

confidence: 81%

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO₂

Shen

Dong

Wang

et al. 2019

Adv Materials Inter

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“…Sol-gel is a versatile synthesis technique to produce different kinds of materials, starting from a colloidal solution of the precursors, which allows obtaining either physical (particulate) or chemical gels. TiO 2 is frequently produced as bulk or nanoparticles from physical gels, 24,25 while to attain chemical gels the stabilization of the sol against the uncontrolled hydrolysis of titanium alkoxides is required. It can be achieved using complexing agents of Ti 4+ , such as b-diketones, including acetylacetone (Hacac), 23,26,27 forming heteroleptic alkoxide complexes able to give micelles by self-assembly.…”

Section: Synthesis Of Gel-derived Defective Tio 2 Materialsmentioning

confidence: 99%

Photocatalytic hydrogen evolution by co-catalyst-free TiO₂/C bulk heterostructures synthesized under mild conditions

et al. 2020

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“…Wu et al developed ultra-small yellow TiO 2 nanoparticles via simple sol-gel process with UV treatment technique. Based on their experimental findings, the origin of the observed yellow color of TiO 2 could be due to titanium vacancies (V Ti ) and titanium interstitials (Ti i ) as shown in Figure 19a [237]. Interestingly, Liu et al prepared the red anatase TiO 2 via a gradient co-doping of B-N into the system.…”

Section: Reduced/defective/colored Tio 2−x Photocatalystsmentioning

confidence: 99%

“…(a) Structure of yellow-TiO 2 and (b) anatase red TiO 2 via gradient B-N co-doping (reproduced with permission from refs [237,238]…”

mentioning

confidence: 99%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

2019

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Photocatalysis is a multifunctional phenomenon that can be employed for energy applications such as H2 production, CO2 reduction into fuels, and environmental applications such as pollutant degradations, antibacterial disinfection, etc. In this direction, it is not an exaggerated fact that TiO2 is blooming in the field of photocatalysis, which is largely explored for various photocatalytic applications. The deeper understanding of TiO2 photocatalysis has led to the design of new photocatalytic materials with multiple functionalities. Accordingly, this paper exclusively reviews the recent developments in the modification of TiO2 photocatalyst towards the understanding of its photocatalytic mechanisms. These modifications generally involve the physical and chemical changes in TiO2 such as anisotropic structuring and integration with other metal oxides, plasmonic materials, carbon-based materials, etc. Such modifications essentially lead to the changes in the energy structure of TiO2 that largely boosts up the photocatalytic process via enhancing the band structure alignments, visible light absorption, carrier separation, and transportation in the system. For instance, the ability to align the band structure in TiO2 makes it suitable for multiple photocatalytic processes such as degradation of various pollutants, H2 production, CO2 conversion, etc. For these reasons, TiO2 can be realized as a prototypical photocatalyst, which paves ways to develop new photocatalytic materials in the field. In this context, this review paper sheds light into the emerging trends in TiO2 in terms of its modifications towards multifunctional photocatalytic applications.

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Ultra-small yellow defective TiO2 nanoparticles for co-catalyst free photocatalytic hydrogen production

Cited by 136 publications

References 46 publications

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO₂

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO₂

Photocatalytic hydrogen evolution by co-catalyst-free TiO₂/C bulk heterostructures synthesized under mild conditions

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

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Ultra-small yellow defective TiO2 nanoparticles for co-catalyst free photocatalytic hydrogen production

Cited by 136 publications

References 46 publications

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO2

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO2

Photocatalytic hydrogen evolution by co-catalyst-free TiO2/C bulk heterostructures synthesized under mild conditions

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

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Product

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Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO₂

Enhancing Photocatalytic Activity of NO Removal through an In Situ Control of Oxygen Vacancies in Growth of TiO₂

Photocatalytic hydrogen evolution by co-catalyst-free TiO₂/C bulk heterostructures synthesized under mild conditions