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Solvent-free direct salt precursor mechanochemical synthesis of La0.5Sr0.5Ti0.5Mn0.5O3-δ oxide perovskite and its electrocatalytic behavior as oxygen electrode for solid oxide cells
被引:0
|作者:
Zouridi, Leila
[1
,2
]
Vourros, Anastasios
[3
,4
]
Garagounis, Ioannis
[3
,4
]
Marnellos, George E.
[3
,4
]
Binas, Vassilios
[2
,5
,6
]
机构:
[1] Univ Crete, Dept Mat Sci & Technol, Iraklion, Greece
[2] Fdn Res & Technol Hellas, Inst Elect Struct & Laser, Iraklion, Greece
[3] Univ Western Macedonia, Dept Mech Engn, Kozani, Greece
[4] Chem Proc & Energy Resources Inst, Ctr Res & Technol Hellas, Thessaloniki, Greece
[5] Univ Crete, Dept Phys, Iraklion, Greece
[6] Aristotle Univ Thessaloniki, Chem Dept, Phys Chem Lab, Thessaloniki, Greece
关键词:
LSTM;
Perovskite;
MIEC electrode;
Symmetrical reversible solid oxide cells;
Mechanochemistry;
Solvent-free;
Solid state synthesis;
Screen printing;
THIN-FILM;
LANTHANUM;
COMBUSTION;
TITANATES;
CATHODES;
CRYSTAL;
ANODES;
SR;
D O I:
10.1016/j.jssc.2023.124293
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
In this work, a solvent-free mechanochemical route is proposed as a direct salt precursor solid state synthesis for the mixed ionic-electronic conducting (MIEC) Lanthanum Strontium Titanium Manganese oxide perovskite (La0.5Sr0.5Ti0.5Mn0.5O3-delta, LSTM). The resulting mechanochemically synthesized powder is structurally and morphologically characterized and is comprised of fine spherical nanostructures in the sub-micron scale (<= 100 nm), with low polydispersity and homogeneous morphology, while the obtained perovskite structure is pure single-phase without any precursor residuals or metal oxide phases. For comparison, conventional synthetic routes (sol-gel and precursor calcination) are presented which result in inferior samples of mixed metal oxides and micron-sized particles. Symmetrical solid oxide cells with single-phase LSTM and LSTM-YSZ composite electrodes reveal a mixed conduction behavior in the temperature range of 700-850 degrees C under flowing synthetic air atmosphere. With a developed current density of 172 mA cm(-2) at 850 degrees C and +2 V overpotential, and an electrode polarization resistance of 7.5 Omega cm(2), perovskite LSTM synthesized by the presented solvent-free direct salt precursor mechanochemical synthesis is therefore proposed as a potential candidate for MIEC electrodes in symmetrical reversible solid oxide cells (r-SOCs).
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