التفاصيل البيبلوغرافية
| العنوان: |
Oxygen Surface Exchange Kinetics of Pr2(Ni,Co)O4+" Thin-Film Model Electrodes. |
| 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] |
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| قاعدة البيانات: |
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