RT Journal Article
T1 Mixed Ionic-Electronic Conductivity, Redox Behavior and Thermochemical Expansion of Mn-Substituted 5YSZ as an Interlayer Material for Reversible Solid Oxide Cells
A1 Natoli, Alejandro
A1 Arias-Serrano, Blanca I.
A1 Rodríguez-Castellón, Enrique
A1 Żurawska, Agnieszka
A1 Frade, Jorge R.
A1 Yaremchenko, Aleksey. A.
K1 Química Inorgánica
AB Manganese-substituted 5 mol.% yttria-stabilized zirconia (5YSZ) was explored as a prospective material for protective interlayers between electrolyte and oxygen electrodes in reversible solid oxide fuel/electrolysis cells. [(ZrO2)0.95(Y2O3)0.05]1−x[MnOy]x (x = 0.05, 0.10 and 0.15) ceramics with cubic fluorite structure were sintered in air at 1600 °C. The characterization included X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), thermogravimetry and dilatometry in controlled atmospheres, electrical conductivity measurements, and determination of oxygen-ion transference numbers by the electromotive force (EMF) technique. Mn-substituted 5YSZ solid solutions exhibit variable oxygen nonstoichiometry with manganese cations in a mixed 2+/3+ oxidation state under oxidizing conditions. Substitution by manganese gradually increases the extent of oxygen content variation on thermal/redox cycling, chemical contribution to thermal expansion and dimensional changes on reduction. It also deteriorates oxygen-ionic conductivity and improves p-type electronic conductivity under oxidizing conditions, leading to a gradual transformation from predominantly ionic to prevailing electronic transport with increasing x. Mn2+/3+→Mn2+ transformation under reducing atmospheres is accompanied by the suppression of electronic transport and an increase in ionic conductivity. All Mn-substituted 5YSZ ceramics are solid electrolytes under reducing conditions. Prolonged treatments in reducing atmospheres, however, promote microstructural changes at the surface of bulk ceramics and Mn exsolution. Mn-substituted 5YSZ with 0.05 ≤ x < 0.10 is considered the most suitable for the interlayer application, due to the best combination of relevant factors, including oxygen content variations, levels of ionic/electronic conductivity and thermochemical expansion
PB IOAP-MPDI
YR 2021
FD 2021-01-30
LK https://hdl.handle.net/10630/25023
UL https://hdl.handle.net/10630/25023
LA eng
NO Natoli A, Arias-Serrano BI, Rodríguez-Castellón E, Żurawska A, Frade JR, Yaremchenko AA. Mixed Ionic-Electronic Conductivity, Redox Behavior and Thermochemical Expansion of Mn-Substituted 5YSZ as an Interlayer Material for Reversible Solid Oxide Cells. Materials. 2021; 14(3):641. https://doi.org/10.3390/ma14030641
NO PhD scholarship of A.N. is funded by the FCT (grant SFRH/BD/116853/2016). Thiswork was supported by the projects HEALING (POCI-01-0145-FEDER-032036) and CARBOSTEAM(POCI-01-0145-FEDER-032295) funded by FEDER through COMPETE2020-Programa OperacionalCompetitividade e Internacionalização (POCI) and by national funds through FCT/MCTES, and bythe project CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020) financedby national funds through the FCT/MCTES and when appropriate co-financed by FEDER underthe PT2020 Partnership Agreement. E.R.-C. thanks to project RTI2018-099668-BC22 of Ministeriode Ciencia, Innovación y Universidades and FEDER funds. A.Z. gratefully acknowledges financial ˙support from the Ministry of Science and Higher Education of the Republic of Poland for StatutoryGrant CPE/098/STAT-MN-AZ/20 in the Institute of Power Engineering. Partial funding for open access charge: Universidad de Málaga
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026