6
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Linking the Electrical Conductivity and Non-Stoichiometry of Thin Film Ce 1−xZr xO 2−δ by a Resonant Nanobalance Approach

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Bulk ceria-zirconia solid solutions (Ce 1−xZr xO 2−δ, CZO) are highly suited for application as oxygen storage materials in automotive three-way catalytic converters (TWC) due to the high levels of achievable oxygen non-stoichiometry δ. In thin film CZO, the oxygen storage properties are expected to be further enhanced. The present study addresses this aspect. CZO thin films with 0 ≤ x ≤ 1 were investigated. A unique nano-thermogravimetric method for thin films that is based on the resonant nanobalance approach for high-temperature characterization of oxygen non-stoichiometry in CZO was implemented. The high-temperature electrical conductivity and the non-stoichiometry δ of CZO were measured under oxygen partial pressures pO 2 in the range of 10 −24–0.2 bar. Markedly enhanced reducibility and electronic conductivity of CeO 2-ZrO 2 as compared to CeO 2−δ and ZrO 2 were observed. A comparison of temperature- and pO 2-dependences of the non-stoichiometry of thin films with literature data for bulk Ce 1−xZr xO 2−δ shows enhanced reducibility in the former. The maximum conductivity was found for Ce 0.8Zr 0.2O 2−δ, whereas Ce 0.5Zr 0.5O 2-δ showed the highest non-stoichiometry, yielding δ = 0.16 at 900 °C and pO 2 of 10 −14 bar. The defect interactions in Ce 1−xZr xO 2−δ are analyzed in the framework of defect models for ceria and zirconia.

          Related collections

          Most cited references94

          • Record: found
          • Abstract: not found
          • Article: not found

          Catalytic Properties of Ceria and CeO2-Containing Materials

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Physical, chemical and electrochemical properties of pure and doped ceria

            M Mogensen (2000)
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Small polaron electron transport in reduced CeO2 single crystals

                Bookmark

                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                05 February 2021
                February 2021
                : 14
                : 4
                : 748
                Affiliations
                [1 ]Institute of Energy Research and Physical Technologies, Clausthal University of Technology, 38640 Goslar, Germany; alexander.wollbrink@ 123456tu-clausthal.de (A.W.); hendrik.wulfmeier@ 123456tu-clausthal.de (H.W.); fatima.ezzahrae.el.azzouzi@ 123456tu-clausthal.de (F.-E.E.A.); holger.fritze@ 123456tu-clausthal.de (H.F.)
                [2 ]Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany; functional.materials@ 123456uni-bayreuth.de (C.S. & R.M.)
                Author notes
                [* ]Correspondence: iurii.kogut@ 123456tu-clausthal.de ; Tel.: +49-5321-3816-8304
                Author information
                https://orcid.org/0000-0002-6855-8460
                https://orcid.org/0000-0002-1410-6979
                https://orcid.org/0000-0001-7622-0120
                Article
                materials-14-00748
                10.3390/ma14040748
                7915746
                33562638
                58547ab3-9bc3-4eb8-934e-c0e5719a9d4a
                © 2021 by the authors.

                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
                : 21 December 2020
                : 31 January 2021
                Categories
                Article

                ceria-zirconia solid solutions,thin films,electrical conductivity,non-stoichiometry,resonant nanobalance,thermogravimetry,reducing atmosphere,redox reactions,defect interactions,three-way catalytic converters (twc)

                Comments

                Comment on this article