Publications
97 results found
Escudero MJ, Aguadero A, Alonso JA, et al., 2007, A kinetic study of oxygen reduction reaction on La<sub>2</sub>NiO<sub>4</sub> cathodes by means of impedance spectroscopy, JOURNAL OF ELECTROANALYTICAL CHEMISTRY, Vol: 611, Pages: 107-116, ISSN: 1572-6657
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- Citations: 312
Aguadero A, Escudero MJ, Perez M, et al., 2007, Hyperstoichiometric La<sub>1.9</sub>Sr<sub>0.1</sub>NiO<sub>4+δ</sub> mixed conductor as novel cathode for intermediate temperature solid oxide fuel cells, JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY, Vol: 4, Pages: 294-298, ISSN: 1550-624X
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- Citations: 26
Aguadero A, Alonso JA, Fernandez-Diaz MT, et al., 2007, <i>In situ</i> high temperature neutron powder diffraction study of La<sub>2</sub>Ni<sub>0.6</sub>Cu<sub>0.4</sub>O<sub>4+δ</sub> in air:: Correlation with the electrical behaviour, JOURNAL OF POWER SOURCES, Vol: 169, Pages: 17-24, ISSN: 0378-7753
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- Citations: 33
Aguadero A, Alonso JA, Martinez-Lope MJ, et al., 2006, <i>In situ</i> high temperature neutron powder diffraction study of oxygen-rich La<sub>2</sub>NiO<sub>4+δ</sub> in air:: correlation with the electrical behaviour, JOURNAL OF MATERIALS CHEMISTRY, Vol: 16, Pages: 3402-3408, ISSN: 0959-9428
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- Citations: 82
Aguadero A, Escudero MJ, Perez M, et al., 2006, Effect of Sr content on the crystal structure and electrical properties of the system La<sub>2-<i>x</i></sub>Sr<i><sub>x</sub></i>NiO<sub>4+δ</sub> (0 ≤ <i>x</i> ≤ 1), DALTON TRANSACTIONS, Pages: 4377-4383, ISSN: 1477-9226
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- Citations: 70
Agüadero A, Pérez M, Alonso JA, et al., 2005, LA2-XSRXNIO4+d (X = 0-0.1) mixed conductors as cathodes for intermediate temperature solid oxide fuel cells, Proceedings of the 1st European Fuel Cell Technology and Applications Conference 2005 - Book of Abstracts, Vol: 2005
Operating solid oxide fuel cells (SOFC) devices at very high temperatures (900-1000°C) has led to a reduced durability of their components and high operating costs. This creates challenges in the development of new materials which are able to succesfully operate at much lower temperatures (550-850°C). In the field of cathodes, mixed ionic electronic conductors with a K2NiF4-type structure have received considerable attention. These promising compounds exhibit satisfactory transport properties and thermal expansion coefficients which match the typical intermediate temperature electrolites ones. The crystal lattice of K2NiF4 structures can be described as a stacking of pcrovskite layers alternating with LaO rock salt layers. The ionic conductivity of these materials is mainly associated to the excess oxygen (d) accomodated in their LaO layers. La2NiO4+d is a compound which has been widely studied. However, it lacks of the adequate electronic conductivity, which can be improved by doping the A position with alkaline-earths. In this regard, strontium is the most appropriate element as its cationic radius is very similar to that of lanthanum. In this work, results relative to the system La2-xSrx NiO4+d (x = 0-0.1) are presented. Excess oxygen determined by iodometric titration shows that the strontium incorporation generates a decrease of the interstitial oxygen. In order to avoid the concomitant decrease of the ionic conductivity, the system underwent heat treatments under high oxygen pressure (200 bar, 650°C). Electrical conductivity of dense samples in air is being measured by a four probe dc method as a function of temperature (500-950°). Symmetrical cells consisting of yttria-stabilized zirconia (YSZ) electrolyte pellets and slurry-coated cathodes have been prepared and their kinetics of the oxygen reaction are being investigated by electrochemical impedance spectroscopy at various temperature and oxygen partial pressure. As well, a neutron diffracti
Aguadero A, Pérez M, Alonso JA, et al., 2005, Neutron powder diffraction study of the influence of high oxygen pressure treatments on La<sub>2</sub>NiO<sub>4+δ</sub> and structural analysis of La<sub>2</sub>Ni<sub>1-<i>x</i></sub>Cu<i><sub>x</sub></i>O<sub>4+δ</sub> (0 ≤ <i>x</i> ≤ 1), JOURNAL OF POWER SOURCES, Vol: 151, Pages: 52-56, ISSN: 0378-7753
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- Citations: 35
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