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

被引：9
|
作者：
Gautam, Sandeep K. [1 ]
Singh, Akanksha [1 ]
Mathur, Lakshya [1 ]
Devi, Nitika [2 ]
Singh, Rajesh K. [2 ]
Song, Sun-Ju [3 ]
Henkensmeier, Dirk [4 ]
Singh, Bhupendra [1 ]
机构：
[1] Banaras Hindu Univ, Indian Inst Technol, Dept Ceram Engn, Varanasi 221005, Uttar Pradesh, India
[2] Cent Univ Himachal Pradesh, Dept Phys & Astron Sci, Dharmshala 176215, Himachal Prades, India
[3] Chonnam Natl Univ, Sch Mat Sci & Engn, 300 Yongbong Dong, Gwang Ju 500757, South Korea
[4] Korea Inst Technol, Fuel Cell Res Ctr, 5 Hwarang Ro 14 Gil, Seoul 136791, South Korea
来源：
IONICS | 2019年 / 25卷 / 01期
关键词：
ZrP2O7-CeP2O7 solid solution; Tetravalent metal pyrophosphate; Ionic conductivity; Intermediate temperature proton-conducting ceramic-electrolyte fuel cells; TETRAVALENT METAL; CERIUM PYROPHOSPHATE; PROTON CONDUCTIVITY; IONIC-CONDUCTIVITY; ZIRCONIUM PYROPHOSPHATE; COMPOSITE ELECTROLYTES; THERMAL-PROPERTIES; ZRP2O7; ZR; SUBSTITUTION;
D O I：
10.1007/s11581-018-2563-x
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
ZrP2O7-CeP2O7 solid solutions, Zr1-xCexP2O7; x=0-0.2 and (Zr0.92Y0.08)(1-y)CeyP2O7; 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-y)CeyP2O7; y=0-0.1 specimens, the electrical conductivity increased 4 orders of magnitude during humidification in air (pH2O=0.12atm). At 80 degrees C, specimen (Zr0.92Y0.08)(0.9)Ce0.1P2O7 (ZYCP10) showed a maximum of 1.72x10(-2)Scm(-1) which decreased sharply at 100 degrees C. Furthermore, Zr0.92Y0.08P2O7 (ZYP), (Zr0.92Y0.08)(0.95)Ce0.05P2O7 (ZYCP5), and ZYCP10 specimens humidified at 160 degrees C showed the maximum conductivity of 1.04x10(-3), 1.32x10(-3), and 8.09x10(-3) Scm(-1), respectively, at 190 degrees C.
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页码：155 / 162
页数：8
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