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Ionics

, Volume 25, Issue 1, pp 155–162 | Cite as

Sintering and electrical behavior of ZrP2O7–CeP2O7 solid solutions Zr1-xCexP2O7; x = 0–0.2 and (Zr0.92Y0.08)1-yCeyP2O7; y = 0–0.1 for application as electrolyte in intermediate temperature fuel cells

  • Sandeep K. Gautam
  • Akanksha Singh
  • Lakshya Mathur
  • Nitika Devi
  • Rajesh K. Singh
  • Sun-Ju Song
  • Dirk Henkensmeier
  • Bhupendra SinghEmail author
Original Paper
  • 168 Downloads

Abstract

ZrP2O7-CeP2O7 solid solutions, Zr1-xCexP2O7; x = 0–0.2 and (Zr0.92Y0.08)1-yCeyP2O7; y = 0–0.1, were prepared by partially replacing Zr4+ with Ce4+ and its effect on the phase composition, sintering behavior, microstructure, and ionic conductivity is analyzed. Ce4+-doped specimens showed improved sintering behavior due to the partial reduction of Ce4+ to Ce3+, as confirmed by X-ray photoelectron spectroscopy (XPS). In unhumidified atmosphere, the electrical conductivity of Zr1-xCexP2O7 increased with increasing cerium content, which can be attributed to the increase in densification and formation of oxygen vacancies due to the partial reduction of Ce4+ to Ce3+. For (Zr0.92Y0.08)1-yCeyP2O7; y = 0–0.1 specimens, the electrical conductivity increased ≥ 4 orders of magnitude during humidification in air (pH2O = 0.12 atm). At 80 °C, specimen (Zr0.92Y0.08)0.9Ce0.1P2O7 (ZYCP10) showed a maximum of 1.72 × 10−2 S cm−1 which decreased sharply at 100 °C. Furthermore, Zr0.92Y0.08P2O7 (ZYP), (Zr0.92Y0.08)0.95Ce0.05P2O7 (ZYCP5), and ZYCP10 specimens humidified at 160 °C showed the maximum conductivity of 1.04 × 10−3, 1.32 × 10−3, and 8.09 × 10−3 S cm−1, respectively, at 190 °C.

Keywords

ZrP2O7-CeP2O7 solid solution Tetravalent metal pyrophosphate Ionic conductivity Intermediate temperature proton-conducting ceramic-electrolyte fuel cells 

Notes

Funding information

This research was supported by the financial assistance from the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), New Delhi, under the Ramanujan Fellowship (SB/S2/RJN-120/2014), Mid-Career Researcher Program (2015R1A2A2A01003852) through NRF grant funded by the MEST, Republic of Korea, and by “KIST Institutional Program” from the Korea Institute of Science and Technology.

Supplementary material

11581_2018_2563_MOESM1_ESM.doc (428 kb)
ESM 1 (DOC 428 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Sandeep K. Gautam
    • 1
  • Akanksha Singh
    • 1
  • Lakshya Mathur
    • 1
  • Nitika Devi
    • 2
  • Rajesh K. Singh
    • 2
  • Sun-Ju Song
    • 3
  • Dirk Henkensmeier
    • 4
  • Bhupendra Singh
    • 1
    Email author
  1. 1.Department of Ceramic EngineeringIndian Institute of Technology (Banaras Hindu University)VaranasiIndia
  2. 2.Department of Physics and Astronomical SciencesCentral University of Himachal PradeshDharamsalaIndia
  3. 3.School of Materials Science and EngineeringChonnam National UniversityGwang-JuRepublic of Korea
  4. 4.Fuel Cell Research CenterKorea Institute of TechnologySeoulRepublic of Korea

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