Study on the Conductivity of La sub(0.4)Sr sub(1.6)CoNbO sub(6- delta ) as an Electrode Material for Symmetrical SOFC
The double-perovskite La sub(0.4)Sr sub(1.6)CoNbO sub(6- delta ) (LSCN) powders were synthesized by the solid-state reaction method. The electrical conductivities of LSCN samples were tested in air and 5 vol%H sub(2)/Ar. The results show that the conductivity of LSCN in 5 vol%H sub(2)/Ar (8.12 Scm s...
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| Veröffentlicht in: | Key engineering materials 2014-03, Vol.602-603, p.858-861 |
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| creator | Zhou, Jiang Tao Lin, Xu Ping Ai, De Sheng Ge, Ben Peng, Zhi Jian |
| description | The double-perovskite La sub(0.4)Sr sub(1.6)CoNbO sub(6- delta ) (LSCN) powders were synthesized by the solid-state reaction method. The electrical conductivities of LSCN samples were tested in air and 5 vol%H sub(2)/Ar. The results show that the conductivity of LSCN in 5 vol%H sub(2)/Ar (8.12 Scm super(-1)) at 850 [degrees]C was higher than that in air (7.03 Scm super(-1)). The activation energy obtained from the Arrhenius function was 0.821 eV in air and 0.707 eV in 5 vol%H sub(2)/Ar. The analysis of XPS shows that there exit three valence states of Co (Co super(+2), Co super(+3), Co super(+4)) and two of Nb (Nb super(+4), Nb super(+5)). The loss of lattice oxygen in LSCN not only produces oxygen vacancies, but also generates excess electrons, which contributes to the electrical conductivity of the LSCN samples. |
| doi_str_mv | 10.4028/www.scientific.net/KEM.602-603.858 |
| format | Article |
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The electrical conductivities of LSCN samples were tested in air and 5 vol%H sub(2)/Ar. The results show that the conductivity of LSCN in 5 vol%H sub(2)/Ar (8.12 Scm super(-1)) at 850 [degrees]C was higher than that in air (7.03 Scm super(-1)). The activation energy obtained from the Arrhenius function was 0.821 eV in air and 0.707 eV in 5 vol%H sub(2)/Ar. The analysis of XPS shows that there exit three valence states of Co (Co super(+2), Co super(+3), Co super(+4)) and two of Nb (Nb super(+4), Nb super(+5)). The loss of lattice oxygen in LSCN not only produces oxygen vacancies, but also generates excess electrons, which contributes to the electrical conductivity of the LSCN samples.</description><identifier>ISSN: 1013-9826</identifier><identifier>DOI: 10.4028/www.scientific.net/KEM.602-603.858</identifier><language>eng</language><subject>Conductivity ; Electrical conductivity ; Electrical resistivity ; Lattice vacancies ; Lattices ; Resistivity ; Solid oxide fuel cells ; X-ray photoelectron spectroscopy</subject><ispartof>Key engineering materials, 2014-03, Vol.602-603, p.858-861</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Zhou, Jiang Tao</creatorcontrib><creatorcontrib>Lin, Xu Ping</creatorcontrib><creatorcontrib>Ai, De Sheng</creatorcontrib><creatorcontrib>Ge, Ben</creatorcontrib><creatorcontrib>Peng, Zhi Jian</creatorcontrib><title>Study on the Conductivity of La sub(0.4)Sr sub(1.6)CoNbO sub(6- delta ) as an Electrode Material for Symmetrical SOFC</title><title>Key engineering materials</title><description>The double-perovskite La sub(0.4)Sr sub(1.6)CoNbO sub(6- delta ) (LSCN) powders were synthesized by the solid-state reaction method. The electrical conductivities of LSCN samples were tested in air and 5 vol%H sub(2)/Ar. The results show that the conductivity of LSCN in 5 vol%H sub(2)/Ar (8.12 Scm super(-1)) at 850 [degrees]C was higher than that in air (7.03 Scm super(-1)). The activation energy obtained from the Arrhenius function was 0.821 eV in air and 0.707 eV in 5 vol%H sub(2)/Ar. The analysis of XPS shows that there exit three valence states of Co (Co super(+2), Co super(+3), Co super(+4)) and two of Nb (Nb super(+4), Nb super(+5)). 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The electrical conductivities of LSCN samples were tested in air and 5 vol%H sub(2)/Ar. The results show that the conductivity of LSCN in 5 vol%H sub(2)/Ar (8.12 Scm super(-1)) at 850 [degrees]C was higher than that in air (7.03 Scm super(-1)). The activation energy obtained from the Arrhenius function was 0.821 eV in air and 0.707 eV in 5 vol%H sub(2)/Ar. The analysis of XPS shows that there exit three valence states of Co (Co super(+2), Co super(+3), Co super(+4)) and two of Nb (Nb super(+4), Nb super(+5)). The loss of lattice oxygen in LSCN not only produces oxygen vacancies, but also generates excess electrons, which contributes to the electrical conductivity of the LSCN samples.</abstract><doi>10.4028/www.scientific.net/KEM.602-603.858</doi></addata></record> |
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| subjects | Conductivity Electrical conductivity Electrical resistivity Lattice vacancies Lattices Resistivity Solid oxide fuel cells X-ray photoelectron spectroscopy |
| title | Study on the Conductivity of La sub(0.4)Sr sub(1.6)CoNbO sub(6- delta ) as an Electrode Material for Symmetrical SOFC |
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