GAO, Lei; LI, Qiang; SUN, Liping; ZHANG, Xianfa; HUO, Lihua; ZHAO, Hui; GRENIER, Jean-Claude

doi:10.1016/j.jpowsour.2017.10.036

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GAO, Lei
Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education

LI, Qiang
Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education

SUN, Liping
Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education

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Journal of Power Sources. 2017-12, vol. 371, p. 86-95

Elsevier

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Cobalt-free provskite oxides Bi0.5Sr0.5Fe1−xNbxO3−δ (BSFNx, x = 0.05, 0.10 and 0.15) were prepared and evaluated as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). In particular, the effects of Nb substitution on phase evolution, thermal expansion behavior and electrochemical performance were systematically investigated. The average thermal expansion coefficient (TEC) of BSFNx decreases from 13.3 × 10−6 K−1 at x = 0.05 to 12.6 × 10−6 K−1 at x = 0.15 within a temperature range of 50–800 °C. Among the BSFNx materials, Bi0.5Sr0.5Fe0.9Nb0.1O3−δ (BSFN0.10) oxide shows the best electrochemical performance. The polarization resistances (Rp) of BSFN0.10 cathode on CGO electrolyte are 0.038, 0.075 and 0.156 Ω cm2 at 700, 650 and 600 °C, respectively. Meanwhile the maximum power densities of the anode-supported single cells are 1.28, 1.54 and 1.34 W cm−2 at 700 °C for BSFNx cathodes with x = 0.05, 0.10, and 0.15, respectively. Furthermore, the relationship study of oxygen partial pressure dependence on Rp indicates that the oxygen reduction reaction (ORR) rate-limiting step is the oxygen adsorption-dissociation on the electrode surface. The desirable electrochemical performance demonstrates that BSFNx oxides are potential cathode materials for IT-SOFCs.< Réduire

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Cobalt-free cathode material

Electrochemical performance : Oxygen reduction kinetics

Solid oxide fuel cells

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A novel family of Nb-doped Bi0.5Sr0.5FeO3-δ perovskite as cathode material for intermediate-temperature solid oxide fuel cells

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