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      TiO 2 Nanowire Networks Prepared by Titanium Corrosion and Their Application to Bendable Dye-Sensitized Solar Cells

      research-article
      Author(s): , , *
      Publication date (Electronic):
      Journal: Nanomaterials
      Publisher: MDPI
      Keywords: TiO2, wet corrosion, dye-sensitized solar cells

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          Abstract

          TiO 2 nanowire networks were prepared, using the corrosion of Ti foils in alkaline (potassium hydroxide, KOH) solution at different temperatures, and then a further ion-exchange process. The prepared nanostructures were characterized by field emission scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The wet corroded foils were utilized as the photoanodes of bendable dye-sensitized solar cells (DSSCs), which exhibited a power conversion efficiency of 1.11% under back illumination.

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          Dye-sensitized solar cells.

          Anders Hagfeldt, Gerrit Boschloo, Licheng Sun … (2011)
          Article 0 comments Cited 1479 times – based on 0 reviews     Review now
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            A review on highly ordered, vertically oriented TiO2 nanotube arrays: Fabrication, material properties, and solar energy applications

            Gopal K. Mor, Oomman Varghese, Maggie Paulose … (2006)
            Article 0 comments Cited 265 times – based on 0 reviews     Review now
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              UV Raman spectroscopic study on TiO2. I. Phase transformation at the surface and in the bulk.

              Jing Zhang, Meijun Li, Zhaochi Feng … (2006)
              Phase transformation of TiO2 from anatase to rutile is studied by UV Raman spectroscopy excited by 325 and 244 nm lasers, visible Raman spectroscopy excited by 532 nm laser, X-ray diffraction (XRD), and transmission electron microscopy (TEM). UV Raman spectroscopy is found to be more sensitive to the surface region of TiO2 than visible Raman spectroscopy and XRD because TiO2 strongly absorbs UV light. The anatase phase is detected by UV Raman spectroscopy for the sample calcined at higher temperatures than when it is detected by visible Raman spectroscopy and XRD. The inconsistency in the results from the above three techniques suggests that the anatase phase of TiO2 at the surface region can remain at relatively higher calcination temperatures than that in the bulk during the phase transformation. The TEM results show that small particles agglomerate into big particles when the TiO2 sample is calcined at elevated temperatures and the agglomeration of the TiO2 particles is along with the phase transformation from anatase to rutile. It is suggested that the rutile phase starts to form at the interfaces between the anatase particles in the agglomerated TiO2 particles; namely, the anatase phase in the inner region of the agglomerated TiO2 particles turns out to change into the rutile phase more easily than that in the outer surface region of the agglomerated TiO2 particles. When the anatase particles of TiO2 are covered with highly dispersed La2O3, the phase transformation in both the bulk and surface regions is significantly retarded, owing to avoiding direct contact of the anatase particles and occupying the surface defect sites of the anatase particles by La2O3.
              Article 0 comments Cited 115 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Nanomaterials (Basel)
                Journal ID (iso-abbrev): Nanomaterials (Basel)
                Journal ID (publisher-id): nanomaterials
                Title: Nanomaterials
                Publisher: MDPI
                ISSN (Electronic): 2079-4991
                Publication date (Electronic): 12 October 2017
                Publication date Collection: October 2017
                Volume: 7
                Issue: 10
                Electronic Location Identifier: 315
                Affiliations
                Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea; saera0907@ 123456gmail.com (S.J.); swh0904@ 123456gmail.com (E.S.)
                Author notes
                [* ]Correspondence: hongj@ 123456cau.ac.kr ; Tel.: +82-2-820-5196
                [†]

                Equal contribution to this work.

                Author information
                https://orcid.org/0000-0002-2891-5785
                Article
                Publisher ID: nanomaterials-07-00315
                DOI: 10.3390/nano7100315
                PMC ID: 5666480
                PubMed ID: 29023369
                SO-VID: bb524ae8-7584-44e0-ab98-353777ded0f0
                Copyright © © 2017 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 10 August 2017
                Date accepted : 25 September 2017
                Categories
                Subject: Article

                Keywords: tio2,wet corrosion,dye-sensitized solar cells
                Data availability:
                Keywords: tio2, wet corrosion, dye-sensitized solar cells

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