Special Issue "TiO2-Based Nanomaterials for Advanced Environmental and Energy-Related Applications"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (1 December 2019).

Special Issue Editor

Prof. Dr. Hiromasa Nishikiori
Website
Guest Editor
Department of Materials Chemistry, Graduate School of Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
Interests: degradation of organic wastes; electric generation using photoanodes; photovoltaic cell; photofuel cell; adsorption property; surface modification; co-catalysis; charge separation processes

Special Issue Information

Dear Colleagues,

Titania has been used as one of the highly stable and UV-active photocatalysts for the decomposition of harmful organic waste and for the generation of electricity in many studies. The power generation frequently employs the titania photoanodes of photovoltaic cells, such as solar or photofuel cells. Therefore, titania should be a model photocatalyst for studies on its development and for the creation of new photocatalysts exhibiting a high performance. The titania structure and morphology should be investigated for the improvement of such functions in the context of the previous successful results of the titania studies. Effective adsorption, oxidation, and reduction are required for a high photocatalytic performance. The catalytic activity, absorptivity, and connectivity of a material surface can be improved by surface modification. Such technologies are applicable for creating new functional materials and for advancing their functions for development in various fields. In the future, visible-light driven photocatalysts can be developed based on the titania studies. In this regard, we invite authors to submit original research articles on titania-based nanomaterials for advanced environmental and energy-related applications.

Prof. Dr. Hiromasa Nishikiori
Guest Editor

Manuscript Submission Information

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Keywords

  • organic compound degradation
  • electric generation
  • photoanode
  • solar cell
  • photofuel cell
  • surface modification

Published Papers (2 papers)

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Research

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Open AccessArticle
Efficient Charge Carrier Separation in l-Alanine Acids Derived N-TiO2 Nanospheres: The Role of Oxygen Vacancies in Tetrahedral Ti4+ Sites
Nanomaterials 2019, 9(5), 698; https://doi.org/10.3390/nano9050698 - 05 May 2019
Cited by 3
Abstract
N-doped TiO2 with oxygen vacancies exhibits many advantages for photocatalysis, such as enhanced visible light absorbency, inhibition of the photogenerated charge carrier recombination, etc. However, preparation of N-doped TiO2 with oxygen vacancies under mild conditions is still a challenge. Herein, N-doped [...] Read more.
N-doped TiO2 with oxygen vacancies exhibits many advantages for photocatalysis, such as enhanced visible light absorbency, inhibition of the photogenerated charge carrier recombination, etc. However, preparation of N-doped TiO2 with oxygen vacancies under mild conditions is still a challenge. Herein, N-doped TiO2 nanospheres with tetrahedral Ti4+ sites were synthesized by using dodecylamine as template and assisted by l-alanine acids. The obtained samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–Vis diffuse reflectance spectra (UV–Vis DRS). It was found that the dodecylamine as a neutral surfactant controlled the structure of TiO2 spherical, while l-alanine acids provided a nitrogen source. The existence of tetrahedral Ti4+ sites in N-doped TiO2 was also confirmed. The N-doped TiO2 sample with tetrahedral Ti4+ sites exhibited significantly improved photocatalytic performance for degradation of methylene blue solution under UV light or visible light irradiation. A combined time-resolved infrared (IR) spectroscopy study reveals that the enhanced photocatalytic performance could be attributed to a large amount of photogenerated charge carriers and efficient charge separation. It is demonstrated that the shallow donor state produced by oxygen vacancies of tetrahedral Ti4+ sites can effectively promote separation of charge carriers besides capturing electrons. Full article
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Review

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Open AccessReview
Recent Advances in TiO2-Based Photocatalysts for Reduction of CO2 to Fuels
Nanomaterials 2020, 10(2), 337; https://doi.org/10.3390/nano10020337 - 17 Feb 2020
Cited by 1
Abstract
Titanium dioxide (TiO2) has attracted increasing attention as a candidate for the photocatalytic reduction of carbon dioxide (CO2) to convert anthropogenic CO2 gas into fuels combined with storage of intermittent and renewable solar energy in forms of chemical [...] Read more.
Titanium dioxide (TiO2) has attracted increasing attention as a candidate for the photocatalytic reduction of carbon dioxide (CO2) to convert anthropogenic CO2 gas into fuels combined with storage of intermittent and renewable solar energy in forms of chemical bonds for closing the carbon cycle. However, pristine TiO2 possesses a large band gap (3.2 eV), fast recombination of electrons and holes, and low selectivity for the photoreduction of CO2. Recently, considerable progress has been made in the improvement of the performance of TiO2 photocatalysts for CO2 reduction. In this review, we first discuss the fundamentals of and challenges in CO2 photoreduction on TiO2-based catalysts. Next, the recently emerging progress and advances in TiO2 nanostructured and hybrid materials for overcoming the mentioned obstacles to achieve high light-harvesting capability, improved adsorption and activation of CO2, excellent photocatalytic activity, the ability to impede the recombination of electrons-holes pairs, and efficient suppression of hydrogen evolution are discussed. In addition, approaches and strategies for improvements in TiO2-based photocatalysts and their working mechanisms are thoroughly summarized and analyzed. Lastly, the current challenges and prospects of CO2 photocatalytic reactions on TiO2-based catalysts are also presented. Full article
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