Next Article in Journal
Enhanced Thermal Conductivity of Polyamide-Based Nanocomposites Containing Graphene Oxide Sheets Decorated with Compatible Polymer Brushes
Previous Article in Journal
An 18-Month Analysis of Bond Strength of Hot-Dip Galvanized Reinforcing Steel B500SP and S235JR+AR to Chloride Contaminated Concrete
Article

Linking the Electrical Conductivity and Non-Stoichiometry of Thin Film Ce1−xZrxO2−δ by a Resonant Nanobalance Approach

1
Institute of Energy Research and Physical Technologies, Clausthal University of Technology, 38640 Goslar, Germany
2
Department of Functional Materials, Bayreuth Engine Research Center (BERC), University of Bayreuth, 95440 Bayreuth, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Roberta G. Toro
Materials 2021, 14(4), 748; https://doi.org/10.3390/ma14040748
Received: 21 December 2020 / Revised: 20 January 2021 / Accepted: 31 January 2021 / Published: 5 February 2021
(This article belongs to the Section Catalytic Materials)
Bulk ceria-zirconia solid solutions (Ce1−xZrxO2−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 pO2 in the range of 10−24–0.2 bar. Markedly enhanced reducibility and electronic conductivity of CeO2-ZrO2 as compared to CeO2−δ and ZrO2 were observed. A comparison of temperature- and pO2-dependences of the non-stoichiometry of thin films with literature data for bulk Ce1−xZrxO2−δ shows enhanced reducibility in the former. The maximum conductivity was found for Ce0.8Zr0.2O2−δ, whereas Ce0.5Zr0.5O2-δ showed the highest non-stoichiometry, yielding δ = 0.16 at 900 °C and pO2 of 10−14 bar. The defect interactions in Ce1−xZrxO2−δ are analyzed in the framework of defect models for ceria and zirconia. View Full-Text
Keywords: ceria-zirconia solid solutions; thin films; electrical conductivity; non-stoichiometry; resonant nanobalance; thermogravimetry; reducing atmosphere; redox reactions; defect interactions; three-way catalytic converters (TWC) ceria-zirconia solid solutions; thin films; electrical conductivity; non-stoichiometry; resonant nanobalance; thermogravimetry; reducing atmosphere; redox reactions; defect interactions; three-way catalytic converters (TWC)
Show Figures

Figure 1

MDPI and ACS Style

Kogut, I.; Wollbrink, A.; Steiner, C.; Wulfmeier, H.; El Azzouzi, F.-E.; Moos, R.; Fritze, H. Linking the Electrical Conductivity and Non-Stoichiometry of Thin Film Ce1−xZrxO2−δ by a Resonant Nanobalance Approach. Materials 2021, 14, 748. https://doi.org/10.3390/ma14040748

AMA Style

Kogut I, Wollbrink A, Steiner C, Wulfmeier H, El Azzouzi F-E, Moos R, Fritze H. Linking the Electrical Conductivity and Non-Stoichiometry of Thin Film Ce1−xZrxO2−δ by a Resonant Nanobalance Approach. Materials. 2021; 14(4):748. https://doi.org/10.3390/ma14040748

Chicago/Turabian Style

Kogut, Iurii, Alexander Wollbrink, Carsten Steiner, Hendrik Wulfmeier, Fatima-Ezzahrae El Azzouzi, Ralf Moos, and Holger Fritze. 2021. "Linking the Electrical Conductivity and Non-Stoichiometry of Thin Film Ce1−xZrxO2−δ by a Resonant Nanobalance Approach" Materials 14, no. 4: 748. https://doi.org/10.3390/ma14040748

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop