Preparation of dense ScSZ thin films by plasma spraying with densified ScSZ powders

Yuan, Kun; Song, Caixia; Chen, Gang; Xu, Z.Y.; Peng, Haoran; Lü, Xiaoliang; Ji, Xiaojuan

doi:10.1016/j.ijhydene.2020.10.084

Cited by 7 publications

(5 citation statements)

References 26 publications

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“…Apparently, this value is still lower than the theoretical OCV of 1.12 V, 34 indicating that the electrolyte is not completely dense. However, this is an acceptable value for SOFC operations and is significantly higher than that (∼0.93 V) of cells with the ScSZ electrolyte obtained by APS reported in the literature, 35,36 in which the electrolyte was deposited at a longer spraying distance (100 mm), whereas the spraying distance for the electrolyte is usually about 70 mm in this study. To evaluate the stability of the half‐cells, the OCV as a function of time was measured at 650 °C, as shown in Figure 6B.…”

Section: Resultscontrasting

confidence: 54%

Atmospheric plasma spraying to fabricate metal‐supported solid oxide fuel cells with open‐channel porous metal support

Lin

Wang

et al. 2022

J Am Ceram Soc.

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Metal‐supported solid oxide fuel cells (MS‐SOFCs) have been fabricated by applying phase‐inversion tape‐casting and atmospheric plasma spraying (APS). The effect of the binder amount of the phase‐inversion slurries on the microstructure development of the 430L stainless steel metal support was investigated. The pore structures, the viscosity of the slurry, porosity and permeability of the as‐prepared metal supports are significantly influenced by the amount of the binder. NiO–scandia‐stabilized zirconia (ScSZ) anode, ScSZ electrolyte and La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) cathode layers were consecutively deposited on the metal support with an ideal microstructure by APS process. The effect of plasma power of the APS on the microstructure of the electrolyte and cathode was investigated. A dense electrolyte layer and a porous cathode layer were successfully obtained at 40 and 6 kW of the APS plasma power, respectively. MS‐SOFCs, with a cell configuration of 430L/Ni‐ScSZ/ScSZ/LSCF, achieved a maximum cell power density of 1079 mW cm−2 at 700°C using humidified H2 as fuel and ambient air as oxidant. The corresponding ohmic resistance and total resistance of MS‐SOFCs was 0.14 and 0.32 Ω cm2, respectively. This work demonstrates the feasibility of fabricating high‐performance MS‐SOFCs with economical and scalable techniques.

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Section: Resultscontrasting

confidence: 54%

Atmospheric plasma spraying to fabricate metal‐supported solid oxide fuel cells with open‐channel porous metal support

Lin

Wang

et al. 2022

J Am Ceram Soc.

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“…A simple strategy to address this issue is to introduce an electron conduction isolation (also often referred to as a protective) layer on the fuel side of the GDC electrolyte. Among all investigated, ZrO 2– -based materials seem to be a logical candidate, as Zr 4+ is thermodynamically stable in reducing atmosphere, as well as being conductive of O 2– ions. Scandium-stabilized zirconia (Sc 0.2 Zr 0.8 O 2−δ , ScSZ) stands out as a very promising isolation material as it not only possesses the highest O 2– conductivity among ZrO 2 -based materials, − but also is a pure ionic conductor at intermediate temperature.…”

Section: Introductionmentioning

confidence: 99%

Superior Electrochemical Performance of a Ce_0.8Gd_0.2O_2−δ/Zr_0.8Sc_0.2O_2−δ Thin Bilayer-Protected Gadolinium-Doped Ceria Electrolyte in Intermediate-Temperature Solid Oxide Fuel Cells

Liu

Cai

et al. 2023

ACS Omega

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To improve the performance of the Ce0.8Gd0.2O2−δ (GDC) electrolyte in a solid oxide fuel cell, it is necessary to block the electronic conduction due to Ce3+/Ce4+ transitions occurring at elevated temperatures. In this work, a GDC/ScSZ double layer consisting of 50 nm GDC and 100 nm Zr0.8Sc0.2O2−δ (ScSZ) thin films were deposited on a dense GDC substrate by the pulsed laser deposition (PLD) technology. The effectiveness of the double barrier layer in blocking the electronic conduction of the GDC electrolyte was investigated. The results showed that the ionic conductivity of GDC/ScSZ–GDC was slightly lower than that of GDC in the temperature range of 550–750 °C, but the difference gradually decreased with the increase in temperature. At 750 °C, the conductivity of GDC/ScSZ–GDC was 1.54 × 10–2 S·cm–1, which was almost the same as that of GDC. The electronic conductivity of GDC/ScSZ–GDC was 1.28 × 10–4 S·cm–1, which was lower than that of GDC. The conductivity results showed that the ScSZ barrier layer can reduce electron transfer effectively. More obviously, the open-circuit voltage and the peak power density of the (NiO–GDC)|GDC/ScSZ–GDC|(LSCF–GDC) cell were higher than those of the (NiO–GDC)|GDC|(LSCF–GDC) cell in the temperature range of 550–750 °C. The superior performance of the GDC/ScSZ–GDC electrolyte is attributed to the ScSZ thin layer, which is effective in blocking the electronic conduction of the GDC electrolyte.

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“…For ScSZ, the reported ionic conductivity trend, high to low, is cubic > tetragonal > rhombohedral > monoclinic (with tetragonal phase), respectively [29]. In addition, ScSZ denser films were prepared also at low oxygen partial pressure using low-pressure plasma spray to achieve higher oxygen ion transport performance [30]. In the fabrication of thin films using PLD, the resulting crystal structure and morphology of the deposited thin films, which directly affect the electrical properties of the thin films, are dependent on the parameters employed during deposition [24,25].…”

Section: Introductionmentioning

confidence: 99%

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

et al. 2022

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Scandium (Sc) and yttrium (Y) co-doped ZrO2 (ScYSZ) thin films were prepared on a SiO2-Si substrate via pulsed laser deposition (PLD) method. In order to obtain good quality thin films with the desired microstructure, various oxygen partial pressures (PO2) from 0.01 Pa to 10 Pa and substrate temperatures (Ts) from 25 °C to 800 °C were investigated. X-ray diffraction (XRD) patterns results showed that amorphous ScYSZ thin films were formed at room substrate temperature while cubic polycrystalline thin films were obtained at higher substrate temperatures (Ts = 200 °C, 400 °C, 600 °C, 800 °C). Raman spectra revealed a distinct Raman shift at around 600 cm−1 supporting a cubic phase. However, a transition from cubic to tetragonal phase can be observed with increasing oxygen partial pressure. Photoemission spectroscopy (PES) spectra suggested supporting analysis that more oxygen vacancies in the lattice can be observed for samples deposited at lower oxygen partial pressures resulting in a cubic structure with higher dopant cation binding energies as compared to the tetragonal structure observed at higher oxygen partial pressure. On the other hand, dense morphologies can be obtained at lower PO2 (0.01 Pa and 0.1 Pa) while more porous morphologies can be obtained at higher PO2 (1.0 Pa and 10 Pa).

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Preparation of dense ScSZ thin films by plasma spraying with densified ScSZ powders

Cited by 7 publications

References 26 publications

Atmospheric plasma spraying to fabricate metal‐supported solid oxide fuel cells with open‐channel porous metal support

Atmospheric plasma spraying to fabricate metal‐supported solid oxide fuel cells with open‐channel porous metal support

Superior Electrochemical Performance of a Ce_0.8Gd_0.2O_2−δ/Zr_0.8Sc_0.2O_2−δ Thin Bilayer-Protected Gadolinium-Doped Ceria Electrolyte in Intermediate-Temperature Solid Oxide Fuel Cells

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

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Preparation of dense ScSZ thin films by plasma spraying with densified ScSZ powders

Cited by 7 publications

References 26 publications

Atmospheric plasma spraying to fabricate metal‐supported solid oxide fuel cells with open‐channel porous metal support

Atmospheric plasma spraying to fabricate metal‐supported solid oxide fuel cells with open‐channel porous metal support

Superior Electrochemical Performance of a Ce0.8Gd0.2O2−δ/Zr0.8Sc0.2O2−δ Thin Bilayer-Protected Gadolinium-Doped Ceria Electrolyte in Intermediate-Temperature Solid Oxide Fuel Cells

Effects of Oxygen Partial Pressure and Substrate Temperature on the Structure and Morphology of Sc and Y Co-Doped ZrO2 Solid Electrolyte Thin Films Prepared via Pulsed Laser Deposition

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Superior Electrochemical Performance of a Ce_0.8Gd_0.2O_2−δ/Zr_0.8Sc_0.2O_2−δ Thin Bilayer-Protected Gadolinium-Doped Ceria Electrolyte in Intermediate-Temperature Solid Oxide Fuel Cells