المؤلفون: Berger, Christian, Egger, Andreas

المصدر: High-Temperature Electrolysis ; page 3-1-3-35 ; ISBN 9780750339513 9780750339490

الإتاحة: https://doi.org/10.1088/978-0-7503-3951-3ch3Test

المؤلفون: Berger, Christian, Phillips, Rory, Pasternak, Iwona, Sobieski, Jan, Strupinski, Wlodek, Vijayaraghavan, Aravind

المساهمون: Engineering and Physical Sciences Research Council

المصدر: 2D Materials ; volume 5, issue 1, page 015025 ; ISSN 2053-1583

الإتاحة: https://doi.org/10.1088/2053-1583/aa8c8aTest

المؤلفون: Berger, Christian, Egger, Andreas, Merkle, Rotraut, Bucher, Edith, Stuhlhofer, Benjamin, Schrödl, Nina, Lammer, Judith, Gspan, Christian, Logvenov, Gennady, Maier, Joachim, Sitte, Werner

المصدر: Journal of The Electrochemical Society; 2019, Vol. 166 Issue 14, pF1088-F1095, 8p

مصطلحات موضوعية: EPITAXY, INDUCTIVELY coupled plasma atomic emission spectrometry, ELECTRON energy loss spectroscopy, SCANNING transmission electron microscopy, ENERGY dispersive X-ray spectroscopy, PULSED laser deposition

مستخلص: Dense thin-film microelectrodes of the first-order Ruddlesden-Popper phases Pr2NiO4+δ (PNO) and Pr2Ni0.9Co0.1O4+δ (PNCO) were prepared by pulsed laser deposition and photolithographic patterning on yttria-stabilized zirconia (YSZ) substrates. The thinfilms were characterized by X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy, inductively coupled plasma optical emission spectroscopy, energy dispersive X-ray spectroscopy and electron energy loss spectroscopy. Investigation of the phase stability of PNO and its reactivity with YSZ was performed by X-ray diffraction analyses after high-temperature treatment in air. Resistive and capacitive contributions of the individual processes occurring at the microelectrodes were determined by means of electrochemical impedance spectroscopy at various temperatures (550 ≤ T/°C ≤ 850) and oxygen partial pressures (1 × 10^-3 ≤ pO2/bar ≤ 1). Oxygen surface exchange coefficients kq and kchem were calculated from the surface resistances and chemical capacitances of the thin-film electrodes. Comparing kq-values of PNO and PNCO shows that substitution of Ni with 10% of Co increases the oxygen surface exchange rates, especially at lower oxygen partial pressures. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Berger, Christian, Bucher, Edith, Gspan, Christian, Menzel, Alexander, Sittea, Werner

المصدر: Journal of The Electrochemical Society; 2017, Vol. 164 Issue 10, pF3008-3018, 11p

مصطلحات موضوعية: SULFUR dioxide, OXYGEN, ELECTRODES

مستخلص: The mass and charge transport properties of La0.8Ca0.2FeO3-δ (LCF82) were determined at 600-800±C and pO2 = 0.1 bar. The electronic conductivity is in the range of 112 S cm-1 at 700±C. The chemical surface exchange coefficient (kchem) and the chemical diffusion coefficient of oxygen (Dchem) were measured. LCF82 shows exceptionally fast oxygen exchange kinetics in pure O2-Ar at 700±C. Long-term measurements at 700±C in pure O2-Ar showed an excellent stability of the kinetic parameters during 1000 h. However, when 2 ppm of sulfur dioxide were added, kchem decreased by a factor of 40 within the first 24 h. After further 1000 h, the total decrease in kchem amounted to two orders of magnitude. Post-test analyses of LCF82 were performed by SEM-EDXS, XPS, and STEM. Ca-enrichment and La-/Fe-depletion of the LCF82 surface occurred during the first 1000 h without SO2. At the surface of the sample exposed to 2 ppm SO2 for additional 1000 h, CaSO4 crystals with diameters of 1-2 µm and an underlying layer of Fe2O3 (thickness approx. 300-450 nm) were found. Remarkably, LCF82 shows faster oxygen exchange kinetics than La0.6Sr0.4CoO3-δ even in the degraded state. Therefore, LCF82 is suggested as a promising material for SOFC and SOEC air electrodes. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Berger, Christian, Bucher, Edith, Gspan, Christian, Menzel, Alexander, Sittea, Werner

المصدر: Journal of The Electrochemical Society; 2017, Vol. 164 Issue 10, pF3008-3018, 11p