Sintering and electrical behavior of ZrP2O7-CeP2O7 solid solutions Zr1-xCexP2O7

Title
Sintering and electrical behavior of ZrP2O7-CeP2O7 solid solutions Zr1-xCexP2O7; x = 0-0.2 and (Zr0.92Y0.08)1-yCeyP2O7

Title
x = 0-0.2 and (Zr0.92Y0.08)1-yCeyP2O7; y = 0-0.1 for application as electrolyte in intermediate temperature fuel cells

Title
y = 0-0.1 for application as electrolyte in intermediate temperature fuel cells
Authors
헨켄스마이어디억Sandeep K. GautamAkanksha SinghLakshya MathurNitika DeviRajesh K. SinghSun-Ju SongBhupendra Singh
Keywords
ZrP2O7-CeP2O7 solid solution; Tetravalent metal pyrophosphate; Ionic conductivity; Intermediate temperature proton-conducting ceramic
Issue Date
2019-01
Publisher
IONICS
Citation
VOL 25-162
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; 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 maximumof 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.
URI
http://pubs.kist.re.kr/handle/201004/68966
ISSN
0947-7047
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KIST Publication > Article
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