Abstract
The efficiency of solid oxide fuel cell cathodes can be improved by microstructural optimization and using active layers, such as doped bismuth oxides. In this work, Bi1.5Y0.5O3 (BYO) films are prepared by spray-pyrolysis deposition at reduced temperatures on a Zr0.84Y0.16O1.92 (YSZ) electrolyte. The influence of the BYO film on the performance of an La0.8Sr0.2MnO3 (LSM) cathode prepared by traditional screen-printing and spray-pyrolysis is investigated. A complete structural, morphological, and electrochemical characterization is carried out by X-ray diffraction, electron microscopy, and impedance spectroscopy. The incorporation of BYO films decreases the Area Specific Resistance (ASR) of screen-printed cathodes from 6.4 to 2.2 Ω cm2 at 650 °C. However, further improvements are observed for the nanostructured electrodes prepared by spray-pyrolysis with ASRs of 0.55 and 1.15 Ω cm2 at 650 °C for cathodes with and without an active layer, respectively. These results demonstrate that microstructural control using optimized fabrication methods is desirable to obtain high-efficiency electrodes for solid oxide fuel cell (SOFC) applications.
Highlights
Solid oxide fuel cells (SOFCs) are considered a highly promising technology for clean and efficient power generation [1,2]
Dense and thin Bi1.5 Y0.5 O3 (BYO) films were successfully prepared on yttria stabilized zirconia (YSZ) electrolyte at a reduced temperature cathodes prepared by screen-printing and spray-pyrolysis deposition, respectively, was investigated
The La1−x Srx MnO3 (LSM) cathode prepared by spray-pyrolysis deposition
Summary
Solid oxide fuel cells (SOFCs) are considered a highly promising technology for clean and efficient power generation [1,2]. The cell efficiency at low temperatures is mainly limited by the oxygen reduction reaction (ORR) in the cathode [3]. La1−x Srx MnO3 (LSM) is still the most widely used cathode material due to its high chemical and thermal stability under the severe operating conditions of the cell, as well as excellent compatibility with the common electrolyte material, yttria stabilized zirconia (YSZ) [4,5]. LSM exhibits a poor ionic conductivity and relatively high activation energy for the oxygen reduction reaction, reducing drastically its electrochemical performance at intermediate temperatures [6,7]. Different strategies have been explored to overcome this limitation: (i) combining LSM with ionic conducting materials, such as YSZ, doped-CeO2 , and Bi2 O3 -based electrolytes [8,9,10]; (ii) the preparation of nanostructured
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