Improved electrical conductivity of Ce0.9Gd0.1O1.95 and Ce0.9Sm0.1O1.95 by co-doping

Bin Li; Xi Wei; Wei Pan

doi:10.1016/j.ijhydene.2009.07.002

Improved electrical conductivity of Ce_0.9Gd_0.1O_1.95 and Ce_0.9Sm_0.1O_1.95 by co-doping

Bin Li
, Xi Wei
, Wei Pan

Energy & Environmental Science & Technology

Research output: Contribution to journal › Article › peer-review

47 Scopus citations

Abstract

Solid electrolytes are the most important and indispensable part of a solid oxide fuel cell (SOFC) where hydrogen is used as one of the fuels to obtain electricity. Ce_0.9Gd_0.1O_1.95 and Ce_0.9Sm_0.1O_1.95 were chosen to be the base electrolytes. The effects of MgO and Nd₂O₃ as co-dopants on the electrical conductivity were investigated, respectively. For 4 mol% Mg-doped Ce_0.9Gd_0.1O_1.95 or Ce_0.9Sm_0.1O_1.95, MgO phases were detected by FESEM micrographs, which showed a very low solubility of Mg²⁺ in ceria lattice. The existence of MgO phases was observed to have negligible effect on the grain conductivity, but improve the grain boundary conductivity measured by ac impedance spectroscopy. However, when Nd₂O₃ was used as a co-dopant, XRD patterns and FESEM both indicated a pure cubic phase. Ce_0.9Gd_0.05Nd_0.05O_1.95 and Ce_0.9Sm_0.05Nd_0.05O_1.95 were found to exhibit higher grain conductivity, comparing with single-doped ceria.

Original language	English
Pages (from-to)	3018-3022
Number of pages	5
Journal	International Journal of Hydrogen Energy
Volume	35
Issue number	7
DOIs	https://doi.org/10.1016/j.ijhydene.2009.07.002
State	Published - Apr 2010

Keywords

Ceria
Co-doping
Electrical conductivity
Solid oxide fuel cells

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10.1016/j.ijhydene.2009.07.002

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@article{185320584a2646d099d6e192474552c2,

title = "Improved electrical conductivity of Ce0.9Gd0.1O1.95 and Ce0.9Sm0.1O1.95 by co-doping",

abstract = "Solid electrolytes are the most important and indispensable part of a solid oxide fuel cell (SOFC) where hydrogen is used as one of the fuels to obtain electricity. Ce0.9Gd0.1O1.95 and Ce0.9Sm0.1O1.95 were chosen to be the base electrolytes. The effects of MgO and Nd2O3 as co-dopants on the electrical conductivity were investigated, respectively. For 4 mol\% Mg-doped Ce0.9Gd0.1O1.95 or Ce0.9Sm0.1O1.95, MgO phases were detected by FESEM micrographs, which showed a very low solubility of Mg2+ in ceria lattice. The existence of MgO phases was observed to have negligible effect on the grain conductivity, but improve the grain boundary conductivity measured by ac impedance spectroscopy. However, when Nd2O3 was used as a co-dopant, XRD patterns and FESEM both indicated a pure cubic phase. Ce0.9Gd0.05Nd0.05O1.95 and Ce0.9Sm0.05Nd0.05O1.95 were found to exhibit higher grain conductivity, comparing with single-doped ceria.",

keywords = "Ceria, Co-doping, Electrical conductivity, Solid oxide fuel cells",

author = "Bin Li and Xi Wei and Wei Pan",

note = "Funding Information: This research was supported by TOYOTA MOTOR Corp.",

year = "2010",

month = apr,

doi = "10.1016/j.ijhydene.2009.07.002",

language = "English",

volume = "35",

pages = "3018--3022",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

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TY - JOUR

T1 - Improved electrical conductivity of Ce0.9Gd0.1O1.95 and Ce0.9Sm0.1O1.95 by co-doping

AU - Li, Bin

AU - Wei, Xi

AU - Pan, Wei

N1 - Funding Information: This research was supported by TOYOTA MOTOR Corp.

PY - 2010/4

Y1 - 2010/4

N2 - Solid electrolytes are the most important and indispensable part of a solid oxide fuel cell (SOFC) where hydrogen is used as one of the fuels to obtain electricity. Ce0.9Gd0.1O1.95 and Ce0.9Sm0.1O1.95 were chosen to be the base electrolytes. The effects of MgO and Nd2O3 as co-dopants on the electrical conductivity were investigated, respectively. For 4 mol% Mg-doped Ce0.9Gd0.1O1.95 or Ce0.9Sm0.1O1.95, MgO phases were detected by FESEM micrographs, which showed a very low solubility of Mg2+ in ceria lattice. The existence of MgO phases was observed to have negligible effect on the grain conductivity, but improve the grain boundary conductivity measured by ac impedance spectroscopy. However, when Nd2O3 was used as a co-dopant, XRD patterns and FESEM both indicated a pure cubic phase. Ce0.9Gd0.05Nd0.05O1.95 and Ce0.9Sm0.05Nd0.05O1.95 were found to exhibit higher grain conductivity, comparing with single-doped ceria.

AB - Solid electrolytes are the most important and indispensable part of a solid oxide fuel cell (SOFC) where hydrogen is used as one of the fuels to obtain electricity. Ce0.9Gd0.1O1.95 and Ce0.9Sm0.1O1.95 were chosen to be the base electrolytes. The effects of MgO and Nd2O3 as co-dopants on the electrical conductivity were investigated, respectively. For 4 mol% Mg-doped Ce0.9Gd0.1O1.95 or Ce0.9Sm0.1O1.95, MgO phases were detected by FESEM micrographs, which showed a very low solubility of Mg2+ in ceria lattice. The existence of MgO phases was observed to have negligible effect on the grain conductivity, but improve the grain boundary conductivity measured by ac impedance spectroscopy. However, when Nd2O3 was used as a co-dopant, XRD patterns and FESEM both indicated a pure cubic phase. Ce0.9Gd0.05Nd0.05O1.95 and Ce0.9Sm0.05Nd0.05O1.95 were found to exhibit higher grain conductivity, comparing with single-doped ceria.

KW - Ceria

KW - Co-doping

KW - Electrical conductivity

KW - Solid oxide fuel cells

UR - https://www.scopus.com/pages/publications/77951024172

U2 - 10.1016/j.ijhydene.2009.07.002

DO - 10.1016/j.ijhydene.2009.07.002

M3 - Article

AN - SCOPUS:77951024172

SN - 0360-3199

VL - 35

SP - 3018

EP - 3022

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 7

ER -

Improved electrical conductivity of Ce_0.9Gd_0.1O_1.95 and Ce_0.9Sm_0.1O_1.95 by co-doping

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