Abstract
Solid Oxide Electrolyzer Cells (SOECs) are very promising electrochemical devices for the production of syngas (H2/CO) by H2O and CO2 co-electrolysis. The structure, microstructure and electrical properties of the fuel electrode material play a crucial role in the performance of the whole cell and efficiency of electrocatalytic reduction of steam into hydrogen. In the present work, a novel Co and Pr co-doped SrTiO3-δ material attracted attention as a potential fuel electrode for SOFC/SOEC. Materials with different praseodymium content were prepared by a solid-state reaction process. XRD confirmed cubic perovskite structure in all obtained samples. SEM results showed porosity in doped materials and EDX proved ABO3 stoichiometry. TEC values were about 1.17–1.26•10−5 K−1 very close to the YSZ electrolyte value. XPS studies turn out that a praseodymium can be multivalent and exist on mixed +3 and + 4 oxidation state. Electrical conductivity of samples was measured by DC 4-wire method in range of 100-800 °C. Highest value of total conductivity was achieved for Sr0.7Pr0.3Ti0.93Co0.07O3-δ and reached 23.7 S∙cm−1. The obtained results were discussed and analyzed in term of defect chemistry.
Highlights
At the current stage of energy sources development, the production of energy from renewables is one of the conceptions to solve the growing energy demand problem
Particular attention should be paid to the processes taking place in extreme conditions - high current density and high
In order to investigate the influence of the praseodymium dopant on the lattice parameter and on the stability of a perovskite structure, the LeBail analysis was performed
Summary
At the current stage of energy sources development, the production of energy from renewables is one of the conceptions to solve the growing energy demand problem. The energy from renewable sources is usually supplied discontinuously, so it is required to be storaged. The very interesting concept is to produce a pure hydrogen or syngas (H2 + CO) by using the electrochemical devises such as Solid Oxide Electrolysis Cells (SOECs). The SOECs devices are very widely studied devices, because of its high efficiency process of changing electricity to fuel [1]. One of the main drawback making difficult to spread the solid oxide electrolysis technology is rapid degradation of the systems. The understanding of degradation processes of fuel electrode is crucial for improve their electrochemical properties. Particular attention should be paid to the processes taking place in extreme conditions - high current density and high
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