Development of Ni-Sr(V,Ti)O3-δ Fuel Electrodes for Solid Oxide Fuel Cells
dc.bibliographicCitation.date | 2022 | |
dc.bibliographicCitation.firstPage | 278 | |
dc.bibliographicCitation.issue | 1 | |
dc.bibliographicCitation.journalTitle | Materials | eng |
dc.bibliographicCitation.volume | 15 | |
dc.contributor.author | Serôdio Costa, Bernardo F. | |
dc.contributor.author | Arias-Serrano, Blanca I. | |
dc.contributor.author | Yaremchenko, Aleksey A. | |
dc.date.accessioned | 2023-03-07T05:08:44Z | |
dc.date.available | 2023-03-07T05:08:44Z | |
dc.date.issued | 2021 | |
dc.description.abstract | A series of strontium titanates-vanadates (STVN) with nominal cation composition Sr1-xTi1-y-zVyNizO3-δ (x = 0–0.04, y = 0.20–0.40 and z = 0.02–0.12) were prepared by a solid-state reaction route in 10% H2–N2 atmosphere and characterized under reducing conditions as potential fuel electrode materials for solid oxide fuel cells. Detailed phase evolution studies using XRD and SEM/EDS demonstrated that firing at temperatures as high as 1200◦C is required to eliminate undesirable secondary phases. Under such conditions, nickel tends to segregate as a metallic phase and is unlikely to incorporate into the perovskite lattice. Ceramic samples sintered at 1500◦C ex-hibited temperature-activated electrical conductivity that showed a weak p(O2 ) dependence and increased with vanadium content, reaching a maximum of ~17 S/cm at 1000◦C. STVN ceramics showed moderate thermal expansion coefficients (12.5–14.3 ppm/K at 25–1100◦C) compatible with that of yttria-stabilized zirconia (8YSZ). Porous STVN electrodes on 8YSZ solid electrolytes were fabricated at 1100◦C and studied using electrochemical impedance spectroscopy at 700–900◦C in an atmosphere of diluted humidified H2 under zero DC conditions. As-prepared STVN electrodes demonstrated comparatively poor electrochemical performance, which was attributed to insufficient intrinsic electrocatalytic activity and agglomeration of metallic nickel during the high-temperature synthetic procedure. Incorporation of an oxygen-ion-conducting Ce0.9Gd0.1O2-δ phase (20–30 wt.%) and nano-sized Ni as electrocatalyst (≥1 wt.%) into the porous electrode structure via infiltration re-sulted in a substantial improvement in electrochemical activity and reduction of electrode polarization resistance by 6–8 times at 900◦C and ≥ one order of magnitude at 800◦C. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/11713 | |
dc.identifier.uri | http://dx.doi.org/10.34657/10746 | |
dc.language.iso | eng | |
dc.publisher | Basel : MDPI | |
dc.relation.doi | https://doi.org/10.3390/ma15010278 | |
dc.relation.essn | 1996-1944 | |
dc.rights.license | CC BY 4.0 Unported | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0 | |
dc.subject.ddc | 600 | |
dc.subject.other | Anode | eng |
dc.subject.other | Electrical conduc-tivity | eng |
dc.subject.other | Electrode polarization | eng |
dc.subject.other | Solid oxide fuel cell | eng |
dc.subject.other | Thermal expansion | eng |
dc.subject.other | Titanate | eng |
dc.subject.other | Vanadate | eng |
dc.title | Development of Ni-Sr(V,Ti)O3-δ Fuel Electrodes for Solid Oxide Fuel Cells | eng |
dc.type | Article | eng |
dc.type | Text | eng |
tib.accessRights | openAccess | |
wgl.contributor | INP | |
wgl.subject | Chemie | ger |
wgl.subject | Physik | ger |
wgl.type | Zeitschriftenartikel | ger |
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