In this study, fabrication of anode-supported solid oxide fuel cells (SOFCs) by cold sintering process (CSP) of electrolyte and anode layers was studied for the first time. A crackfree thin layer of 8YSZ electrolyte supported by a porous NiO-8YSZ anode was obtained by using the cold sintering process at 200 °C and 450 MPa uniaxial pressure for 1 h which then was post sintered at 1225 °C in conventional furnaces. Despite the much lower post-sintering temperatures as compared to the conventional ones at about 1400 °C, a continuous electrolyte/anode interface that was free of any defects such as delamination was achieved. Monolithic electrolyte prepared under identical conditions reached 95% of its theoretical density. Utilization of the cold sintering process resulted in limited grain growth in the anode which enhanced long triple-phase boundary densities. SOFCs constructed from cold-sintered 8YSZ/NiO-8YSZ bilayers exhibited opencircuit potentials of 0.90−0.85 V at 700−800 °C, confirming a fairly dense 8YSZ electrolyte. The highest power density achieved at 800 °C was 158 mW/cm 2 , which most likely would have the potential to be improved significantly upon further decreasing the anode thickness.
Silver (Ag) inks are
often used as precursors to form current collector layers on the
intermediate-temperature solid oxide fuel cell (SOFC) cathodes. It has been
common practice to add glassy phase (frit) particles into the Ag inks to
achieve good adhesion between the current collector and the cathode layers upon
firing. However, insufficient attention has been given to the effects of frit
content on the microstructure and the current collecting properties of Ag
layers. This study presents the effect of frit addition on the measured
electrochemical performance of La0.6Sr0.4FeO3
(LSF) thin film cathodes. Microstructural analyses reveal that frit addition
significantly densifies the Ag current collector layer. The glassy phase
replacing Ag reduces the contact area between the Ag particles and the LSF thin
film cathode, resulting in increased ohmic resistances. The glassy phase also
seals the electrocatalytic surface of the LSF thin film, thus enhancing the
cathode polarization resistances. Electrochemical impedance spectroscopy
measurements on symmetrical half-cells reveal that ohmic resistances matching
the resistivity of the yttria stabilized zirconia electrolyte (YSZ) and
acceptable cathode polarization resistances (e.g., 0.5 Ωcm2 at 700℃ in air) can be obtained when frit-free Ag current collector inks are
used.
Bu çalışmada, sol-jel yöntemi ile tetraetil ortosilikat (TEOS) ön başlatıcısı varlığında zirkonyum fosfat (ZrP) ve Poli (etilen oksit) temelli ZrP/ PEO kompozit malzemesi üretilmiştir. Hazırlanan malzemenin yapısı X-ışını difraksiyonu (XRD) ve Fourier transform IR spektroskopisi (FTIR) yöntemleri ile incelenmiştir. Isısal özellikleri ise termal gravimetrik analiz (TGA) ile incelenmiştir. TGA analizinde, sentezlenen malzemenin 300 °C'e kadar kararlı olduğu bulunmuştur. Üretilen bu malzemenin maliyeti düşüktür, ayrıca ısıtıldığında 100 °C'nin üzerindeki sıcaklıklarda 300 °C ye kadar bozulmaya uğramamaktadır. 300 °C'ye kadar olan ısısal kararlılığı ve su tutma kabiliyeti sayesinde ZrP/PEO kompozit malzemesi, ara sıcaklık yakıt pillerinde kullanılabilme potansiyeline sahiptir.
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