Optical absorption and XPS studies of (Ba1-xSrx)(Ce0.75Zr0.10Y0.15)O3-δ electrolytes for protonic ceramic fuel cells

Shivendra Kumar Jaiswal, Jongsup Hong, Kyung Joong Yoon, Ji Won Son, Hae Weon Lee, Jong Ho Lee

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14 Citations (Scopus)

Abstract

Perovskite-type materials containing metal and cerium cations have been used as catalysts, membranes, electrodes in fuel cells, and hydrogen pumps. The effect of strontium doping on the perovskite-type structure has been evaluated and effectively maintains the cubic structure of (Ba1-xSrx)(Ce0.75Zr0.10Y0.15)O3-δ. X-ray photoelectron spectroscopy (XPS) was performed on the oxidation states of barium, strontium, cerium, zirconium, yttrium and oxygen. With strontium doping, the oxidation state of cerium ions in 4+ increases and results in the decrease in oxygen vacancy concentration. These are attributed to the strong binding energy of (A/B)-O bond which in turn, enhances the structural stability of electrolyte system. The free volume (Vf) is maximum for x=0.2 (Vf=33.1 Å3) and then decreases with further strontium insertion. The optical absorption peaks are attributed to charge transfer transitions and energy band gap (increases from ∼4.13 to ∼4.35 eV). However, the increase of band gap is only ∼5% with partial replacement of barium by strontium. These characteristics are useful to make (Ba1-xSrx)(Ce0.75Zr0.10Y0.15)O3-δ a promising candidate for futuristic and reliable fuel cell technology.

Original languageEnglish
Pages (from-to)10366-10372
Number of pages7
JournalCeramics International
Volume42
Issue number8
DOIs
Publication statusPublished - 2016 Jun 1

Bibliographical note

Funding Information:
This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy , Republic of Korea (No. 20143030031430 ) and partially funded by the Institutional Research Program of KIST (No. 2E26081 ).

Publisher Copyright:
© 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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