Metal-doped pyrochlore as novel electrode materials for intermediate temperature solid oxide fuel cell

Chia Kan Hao, Chi-Shen Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this study, the metal-doped La2(Zr1-xW x)2O7 (LWZO) pyrochlore phases were synthesized by Pechini sol-gel method and characterized by X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The phase width of tungsten is x = 0.1 - 0.15. Temperature-programmed reduction (TPR) shows that the as-prepared products are stable under hydrogen atmosphere. XPS measurements revealed the valence state of La3+, Zr4+, and W(5+, 6+). The ionic- and electronic- conductivity of the 15% W-doped LWZO is 2.2×10-3 to 1.9×10-2 S/cm from 400 to 700 °C, which is better than YSZ and GDC over this temperature range. The LWZO is stable up to 1400 °C under reduced atmosphere. Bottom cells were fabricated with the LWZO electrolyte and GDC. The results shown that the La 2(Zr1-xWx)2O7+δ have a good potential of becoming the electrolyte for IT-SOFCs.

Original languageEnglish
Pages (from-to)165-173
Number of pages9
JournalECS Transactions
Volume58
Issue number3
DOIs
StatePublished - 1 Jan 2013

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