Phase formation and ionic conductivity studies on ytterbia co-doped scandia stabilized zirconia (0.9ZrO2–0.09Sc2O3–0.01Yb2O3) electrolyte for SOFCs

Lakshmi, V. V. K.; Bauri, Ranjit

doi:10.1016/j.solidstatesciences.2011.05.014

Cited by 34 publications

(9 citation statements)

References 32 publications

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“…that working with YbScSZ allows the use of electrolyte supported cells (thickness >150 mm) at temperatures above 800 C. Therefore, a low enough resistance contribution to the cell is expected for the 165 mm thick electrolyte employed in this work at 850 C. The conductivity of the electrolyte is in agreement with previously reported values for similar compositions. 26,27 Fig. 3 shows the XRD of the as-synthesized LSCM powders together with the diffraction patterns of the powder aer being thermally treated for 75 hours in dry and wet CO 2 at temperatures between 750 C and 900 C. According to the XRD patterns, the as-synthesized LSCM presents a single phase, which remains stable to carbonation under dry and wet CO 2 atmospheres at operating temperatures.…”

Section: Experimental Methodsmentioning

confidence: 99%

Co-electrolysis of steam and CO₂ in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

et al. 2015

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The use of cermets as fuel electrodes for solid oxide electrolysis cells requires permanent circulation of reducing gas, e.g. H2 or CO, so called safe gas, in order to avoid oxidation of the metallic phase. Replacing metallic based electrodes by pure oxides is therefore proposed as an advantage for the industrial application of solid oxide electrolyzers. In this work, full-ceramic symmetrical solid oxide electrolysis cells have been investigated for steam/CO2 co-electrolysis. Electrolyte supported cells with La(0.75)Sr(0.25)Cr(0.5)Mn(0.5)O3-δ reversible electrodes have been fabricated and tested in co-electrolysis mode using different fuel compositions, from pure H2O to pure CO2, at temperatures between 850-900 °C. Electrochemical impedance spectroscopy and galvanostatic measurements have been carried out for the mechanistic understanding of the symmetrical cell performance. The content of H2 and CO in the product gas has been measured by in-line gas micro-chromatography. The effect of employing H2 as a safe gas has also been investigated. Maximum density currents of 750 mA cm(-2) and 620 mA cm(-2) have been applied at 1.7 V for pure H2O and for H2O : CO2 ratios of 1 : 1, respectively. Remarkable results were obtained for hydrogen-free fuel compositions, which confirmed the interest of using ceramic oxides as a fuel electrode candidate to reduce or completely avoid the use of safe gas in operation minimizing the contribution of the reverse water shift reaction (RWSR) in the process. H2 : CO ratios close to two were obtained for hydrogen-free tests fulfilling the basic requirements for synthetic fuel production. An important increase in the operation voltage was detected under continuous operation leading to a dramatic failure by delaminating of the oxygen electrode.

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Section: Experimental Methodsmentioning

confidence: 99%

Co-electrolysis of steam and CO₂ in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

et al. 2015

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“…The solid electrolyte structure is supposed to enhance cubic phase stability by co-doping B 2 O 3 . 53 Alumina also demonstrated positive effects on ScSZ electrolyte when a co-doping procedure was implemented to achieve a new solid electrolyte composition. 54 Meanwhile, the Mn co-doping in ScSZ electrolyte was stabilized the solid electrolyte structure during cell operating condition in the term process.…”

Section: The Progress Of Scsz Electrolyte Modificationmentioning

confidence: 99%

Advanced modification of scandia‐stabilized zirconia electrolytes for solid oxide fuel cells application—A review

Zakaria

Kamarudin

2020

Intl J of Energy Research

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Solid oxide fuel cells (SOFCs) are recognized as an energy generation device with high power density and energy conversion efficiency, low noise, low greenhouse gas emissions, positive environmental effect, and high fuel consumption versatility. Nevertheless, the high operating temperature of SOFCs has restricted the development in various applications due to challenges in material compatibility and working process. To address these issues, scandiastabilized zirconia (ScSZ) electrolytes are commonly utilized to explore its potentials as a solid electrolyte toward lowering the operating temperature due to high conductivity properties at low-to-intermediate temperature conditions. Thus, this paper provides an advanced modification of ScSZ electrolytes in SOFCs toward lowering the operating temperature. This review presents the potential properties and the progress modification of ScSZ electrolyte including challenges, and advances, summary, and future perspectives in the low-tointermediate operating temperature of SOFCs. This review can serve as a first reference for identifying specific parameters and prospective studies to enhance the properties of ScSZ electrolytes for the application of SOFCs. Based on the literature review, there are no previous review works that have been published on the modification of ScSZ electrolytes.

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“…Despite the interest of ScSZ as a substitute for YSZ in ESCs, the cubic phase of ScSZ presents certain instabilities under operation in the long term (especially in SOEC mode), giving rise to the formation of less conductive non-cubic domains [19]. This problem can be partially solved by doping ScSZ with Yb, which improves the long term durability while keeping a reasonable conductivity above YSZ [11,20,21]. The level of Yb doping can be tailored for specific performance requirements, being (ZrO 2 ) 0.9 (Yb 2 O 3 ) 0.06 (Sc 2 O 3 ) 0.04 ) (6Yb4ScSZ) a good trade-off for both conductivity and durability for operation in SOFC and SOEC modes [22].…”

Section: Introductionmentioning

confidence: 99%

3D printed electrolyte-supported solid oxide cells based on Ytterbium-doped scandia-stabilized zirconia

Márquez,

Anelli,

Nuñez

et al. 2024

J. Phys. Energy

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Solid oxide cells are an efficient and cost-effective energy conversion technology able to operate reversibly in fuel cell and electrolysis mode. Electrolyte-supported solid oxide cells have been recently fabricated employing 3D printing to generate unique geometries with never-explored capabilities. However, the use of the state-of-the-art electrolyte based on yttria-stabilized zirconia limits the current performance of such printed devices due to a limited oxide-ion conductivity. In the last years, alternative electrolytes such as scandia-stabilized zirconia became more popular to increase the performance of electrolyte-supported cells. In this work, stereolithography 3D printing of scandia-stabilized zirconia co-doped with ytterbia was developed to fabricate solid oxide cells with planar and corrugated architectures. Symmetrical and full cells with about 250 μm-thick electrolytes were fabricated and electrochemically characterized using impedance spectroscopy and galvanostatic studies. Maximum power density of 500mW/cm2 in fuel cell mode and an injected current of 1A/cm2 at 1.3V in electrolysis mode, both measured at 900ºC, were obtained demonstrating the feasibility of 3D printing for the fabrication of high-performance electrolyte-supported solid oxide cells. This, together with excellent stability proved for more than 350h of operation, opens a new scenario for using complex-shaped solid oxide cells in real applications.

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Phase formation and ionic conductivity studies on ytterbia co-doped scandia stabilized zirconia (0.9ZrO2–0.09Sc2O3–0.01Yb2O3) electrolyte for SOFCs

Cited by 34 publications

References 32 publications

Co-electrolysis of steam and CO₂ in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

Co-electrolysis of steam and CO₂ in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

Advanced modification of scandia‐stabilized zirconia electrolytes for solid oxide fuel cells application—A review

3D printed electrolyte-supported solid oxide cells based on Ytterbium-doped scandia-stabilized zirconia

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Phase formation and ionic conductivity studies on ytterbia co-doped scandia stabilized zirconia (0.9ZrO2–0.09Sc2O3–0.01Yb2O3) electrolyte for SOFCs

Cited by 34 publications

References 32 publications

Co-electrolysis of steam and CO2 in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

Co-electrolysis of steam and CO2 in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

Advanced modification of scandia‐stabilized zirconia electrolytes for solid oxide fuel cells application—A review

3D printed electrolyte-supported solid oxide cells based on Ytterbium-doped scandia-stabilized zirconia

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Co-electrolysis of steam and CO₂ in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas

Co-electrolysis of steam and CO₂ in full-ceramic symmetrical SOECs: a strategy for avoiding the use of hydrogen as a safe gas