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Synthesis and electrical properties of Al-doped Sr2MgMoO6-δ as an anode material for solid oxide fuel cells

✍ Scribed by Zhixiang Xie; Hailei Zhao; Ting Chen; Xiong Zhou; Zhihong Du

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
781 KB
Volume
36
Category
Article
ISSN
0360-3199

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✦ Synopsis

Electrical conductivity Double perovskite structure a b s t r a c t Aluminum doped Sr 2 MgMoO 6-d (SMMO) was synthesized via citrate-nitrate route. Dense samples of Sr 2 Mg 1-x Al x MoO 6Àd (0 x 0.05) were prepared by sintering the pellets at 1500 C in air and then reducing at 1300 C in 5%H 2 /Ar. The electrical conductivity strongly depended on the preparing atmosphere, samples reduced in 5%H 2 /Ar exhibited higher conductivity than those unreduced. Al-doping increased remarkably the electrical conductivity of Sr 2 Mg 1-x Al x MoO 6Àd . The reduced samples displayed a relatively stable electrical conductivity under oxygen partial pressure (Po 2 ) from 10 À19 to 10 À14 atm at 800 C, and exhibited an excellent recoverability in electrical conductivity when cycled in alternative air and 5%H 2 /Ar atmospheres. Sr 2 Mg 0.95 Al 0.05 MoO 6Àd material showed a good chemical compatibility with LSGM and GDC electrolytes below 1000 C, while there was an obvious reaction with YSZ. Al-doping improves the anode performance of SMMO in halfcell of Pt/Sr 2 Mg 1-x Al x MoO 6Àd rGDCrPt in H 2 fuel. The present results demonstrate that Sr 2 Mg 1-x Al x MoO 6Àd is a potential anode material for intermediate temperature-Solid Oxide Fuel Cells (IT-SOFCs).

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