Journal Article

Impact of electrical conductivity and the electrochemical performance of La2NiO4+δ and La4Ni3O10±δ cathodes on symmetric cells for intermediate-temperature SOFCs

Avellaneda, D., Costilla-Aguilar, S. U., Cienfuegos-Pelaes, R. F., Aguilar-Martinez, J. A., Escudero, M. J., Torres-Castro, Alejandro, González-González, Virgilio

2024

Overview

In the present work, the Ruddlesden-Popper (RP) phases La 2 NiO 4+δ (La2) and La 4 Ni 3 O 10±δ (La4) were employed as cathode materials with Gd 0.1 Ce 0.9 O 2-δ (GDC) electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs). Cathode inks were deposited on the GDC substrate by the dip-coating technique. The electrochemical properties of the cathode in symmetric cells with GDC were investigated. The area-specific resistance (ASR) of the La 4 Ni 3 O 10±δ cathode is lower than that of the La 2 NiO 4+δ cathode at 600, 700, and 800 ºC, with values of 6.91, 1.22, and 0.23 Ω cm 2 , respectively. These values are better than other RP families previously reported. This work combines cathode layers to form multilayers as a La2La4La2 symmetric cell, enhancing the oxygen reduction reaction (ORR) properties, which exhibit an ASR value of 0.12 Ω cm 2 at 800 °C. We report a performance in a symmetric cell using a configuration with La2 and La4 cathodes that could be a promising alternative for IT-SOFCs. Graphical abstract

• Publisher: Springer US,Springer Nature B.V
• Subject: Alkali-silica reactions / Cathodes / Characterization and Evaluation of Materials / Chemical reduction / Chemistry and Materials Science / Classical Mechanics / Crystallography and Scattering Methods / Dip coatings / electrical conductivity / Electrical resistivity / Electrochemical analysis / electrochemistry / Electrode materials / electrolytes / Electrolytic cells / Electrons / Energy Materials / Immersion coating / Inks / Materials Science / Multilayers / Oxygen reduction reactions / Polymer Sciences / Solid Mechanics / Solid oxide fuel cells / Substrates