The structural and electrical properties of samarium doped ceria films formed by e-beam deposition technique

Virbukas, Darius; Laukaitis, Giedrius

doi:10.1016/j.ssi.2016.12.003

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…An important factor is the almost complete absence of film contamination with components of the camera and auxiliary devices' materials due to a small beam width. E-beam PVD, modification of this method, was used for deposition of various electrolyte films [34], [35]. Pulsed laser ablation deposition (PLD) if used for high quality thin films, ease of operation and reproducibility and the films obtained do not require post-treatment at high temperatures.…”

Section: Physical Methodsmentioning

confidence: 99%

Place of electrophoretic deposition among thin-film methods adapted to the solid oxide fuel cell technology: A short review

Pikalova¹,

Калинина²

2019

Int. J. EQ

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Thin film technologies have attracted ever-growing interest in different industrial areas. Concerning solid oxide fuel cells (SOFCs), especially devices operating in the intermediate temperature range, such technologies are applied particularly for the deposition of dense, gas-tight electrolyte films with a thickness of several µm to decrease ohmic resistance and enhance the cell performance. The main requirements for the technology selected are its low cost, simplicity of the equipment used, short deposition time and flexibility regarding the cell shape. First, we overview thin-film technologies adapted to the deposition of SOFC functional layers, discussing their strengths and weaknesses, with special attention given to electrophoretic deposition (EPD) as being the most simple and cost-effective colloidal method to fabricate different electrolyte films. Then we present the contribution of our scientific group in the development of the EPD method. The preparation of stable suspensions for the EDP is one of the key requirements for its successful implementation and reproducibility; this was considered in detail and the effect of self-stabilization in suspensions based on nanopowders (7-15 nm), obtained by the method of laser evaporation with consequent condensation, was discussed. Such suspensions, exhibiting high positive ζ-potential values (30-50 mV), were shown to be suitable for EPD without the addition of dispersants or iodine. The requirements for the electrode substrates were formulated and a model of particle aggregation near the porous substrate surface was proposed. Deposition parameters were established for different electrolyte films -commonly used yttria-stabilized zirconia, single and multiply doped CeO 2 and proton-conducting doped BaCeO 3 electrolytes. As was shown, the deposition on the highly conducting cathode substrates is simpler to implement than the EPD on non-conducting anode substrates and, in addition, it produces high quality films which render high OCV values and superior SOFC performance.

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Section: Physical Methodsmentioning

confidence: 99%

Place of electrophoretic deposition among thin-film methods adapted to the solid oxide fuel cell technology: A short review

Pikalova¹,

Калинина²

2019

Int. J. EQ

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“…In another study, Sriubas et al 153 fabricated ScAlSz thin films of thickness 2 μm where an effect of Al concentration on structure, microstructure, and electrochemical properties was reported. The deposition rate was achieved ~0.2 nm/s and 1.6 nm/s on taking concentration of Al as 15.9 atomic % and 3.8 atomic %, respectively.…”

Section: Fabrication Techniques For Sofcsmentioning

confidence: 99%

“…To avoid this condition, the YSZ is slip cast on the anode by keeping the pores open enough for the gas transportation. The CGO diffusion layer was fabricated on the YSZ electrolyte layer to avoid interconnection between the cathode and YSZ electrolyte where the current density of 0.93 A/cm 2 was achieved at 650 C. Virbukas and Laukaitis 153 deposited SDC thin ceramic films on SS Alloy 600 and SiO 2 substrates to study an influence of deposition rate. The crystallite size was found to be decreased with an increased deposition rate.…”

Section: Electron Beam Evaporationmentioning

confidence: 99%

A review on materials, advantages, and challenges in thin film based solid oxide fuel cells

Chasta

Himanshu

Dhaka

2022

Intl J of Energy Research

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Summary In accomplishment of massive energy demand, the solid oxide fuel cells (SOFCs) have proven as apotheosis candidates due to their high energy conversion efficiencies, low pollution exhaust, fuel flexibility, and environmental friendliness which make these the most promising alternatives to conventional electricity generators. Despite numerous advantages of SOFCs, large‐scale industrial applications are yet to be realized owing to their high operating temperatures (800°C‐1000°C). To lower the operating temperature, it is crucial to minimize ionic resistances which can be accomplished by reducing the electrolyte thickness to lesser than 5 μm. Therefore, present article embraces a concise review on conventional materials, designs, and generations of SOFCs with their compatibility and drawbacks. The strengths and limitations of conventional and advanced tools for fabricating thin film based SOFCs (TF‐SOFCs) as well as the associated properties of electrolytes and electrodes are thoroughly examined, and further route cast is provided to attain better performance. The present review encourages the development of TF‐SOFCs using advanced techniques employing ultrathin single and bilayer electrolytes which can have potential to reduce the operating temperature of SOFCs from 450°C to 600°C region and pave the way for global commercialization.

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“…There are few papers written by D. Virbukas et al, where the influence of the specific surface area of powders is discussed. Authors studied Gd 0.1 Ce 0.9 O 2-δ (S BET : 6.44; 36.2; 201 m 2 /g), and Sm 0.15 Ce 0.85 O 2-δ (S BET : 39.3 m 2 /g) thin films deposited on room temperature substrates and did not find a significant influence of the specific surface area of ceria powders on the microstructure of thin films [12,13]. These investigations were carried out with the thin films deposited at room temperature without investigating the thin films deposited on higher temperature substrates.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Initial Powder’s Specific Surface Area on the Properties of Sm-Doped Ceria Thin Films

et al. 2018

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The influence of a specific surface area of evaporating powder on the properties of thin Sm-doped cerium (SDC) oxide films has not yet been sufficiently investigated. Therefore, SDC films were deposited by e-beam evaporation using Sm0.2Ce0.8O2-δ powders of 6.2 m2/g, 11.3 m2/g, and 201.3 m2/g specific surface area on SiO2, and Al2O3 substrates. X-Ray Diffraction (XRD) analysis showed that SDC thin films deposited on 600 °C SiO2 substrates changed their preferred orientation from (111) to (311), (200), and (220) when evaporating 6.2 m2/g and 11.3 m2/g powders and using 0.2 nm/s, 1.2 nm/s, and 1.6 nm/s deposition rates. However, thin films deposited by evaporating powder of 201.3 m2/g specific surface area do not change their preferred orientation. The crystallite size of the SDC thin films depends on the substrate temperature and specific surface area of the evaporating powder. It increases from 6.40 nm to 89.1 nm with increasing substrate temperature (50–600 °C). Moreover, crystallites formed by evaporating a powder of 201.3 m2/g specific surface area are 1.4 times larger than crystallites formed by evaporating a powder of 6.2 m2/g specific surface area. An impedance analysis revealed that the normalized resistance of “grains” is higher than the normalized resistance of grain boundaries. Moreover, a total conductivity depends on crystallite size. It changes from 4.4 × 10−7 S/cm to 1.1 × 10−2 S/cm (600 °C) when the crystallite sizes vary from 6.40 nm to 89.10 nm. In addition, the optical band gap becomes wider with increasing crystallite size proving that the Ce3+ concentration decreases with an increasing crystallite size.

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The structural and electrical properties of samarium doped ceria films formed by e-beam deposition technique

Cited by 9 publications

References 23 publications

Place of electrophoretic deposition among thin-film methods adapted to the solid oxide fuel cell technology: A short review

Place of electrophoretic deposition among thin-film methods adapted to the solid oxide fuel cell technology: A short review

A review on materials, advantages, and challenges in thin film based solid oxide fuel cells

Influence of the Initial Powder’s Specific Surface Area on the Properties of Sm-Doped Ceria Thin Films

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