Effects of Ni diffusion on the accelerated conductivity degradation of scandia-stabilized zirconia films under a reducing atmosphere

Yun, Kyong Sik; Kwon, Y.; Kim, Jung-Hwa; Jo, Sangyoung; Yoo, Chung‐Yul; Yu, Ji Haeng; Joo, Jong Hoon

doi:10.1016/j.jeurceramsoc.2016.02.007

Cited by 18 publications

(6 citation statements)

References 34 publications

(41 reference statements)

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“…3d, which was recorded under identical thermodynamic conditions to the present work. 25 It can be observed from the figure that the conductivity drops for 11SSZ, 0.2Ca11SSZ 0.5Ca11SSZ and 1Ce10SSZ are 15.81, 6.55, 13.98, and 15.44% in 100 h. These numbers are almost double compared to the oxidizing atmosphere which is similar to the literature. 38 To identify the reason behind this degradation and discrepancies, post-stability XRD was examined and shown in Fig.…”

Section: Resultssupporting

confidence: 86%

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Role of Divalent Co-Dopant as Structure Stabilizer in Scandia-Stabilized Zirconia Electrolyte for SOFC

Mathur,

Shin,

Hanantyo

et al. 2023

J. Electrochem. Soc.

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The present investigation reports the role of divalent binary co-dopant (Ca2+) in 11 mol% scandia stabilized zirconia (11SSZ) electrolytes to resolve its severe long-term aging issue for application in solid oxide fuel cells (SOFC). Dense electrolytes were formulated via the solid-state reaction method and their crystal structure was identified by X-ray diffractometer (XRD). To examine total electrical conductivity and its stability in oxidizing and reducing atmosphere DC four-point probe measurement was used. Among all the compositions, 0.2Ca11SSZ demonstrates the highest conductivity of 0.075 S cm−1 at 800 °C, with excellent stability of 6.7%/100 h in a reducing (97 vol% H2/3 vol% H2O) atmosphere. However, the presence of 0.5 mol% calcium in 11SSZ results in more than threefold suppression of aging rate compared to undoped11SSZ i.e. 2.19%/200 h in air atmosphere at 800 °C. Additionally, the doping of divalent Ca2+ widens the electrolytic domain up to pO2 ∼ 10−26 atm at 1000 °C compared to state-of-art 8YSZ (pO2 ∼ 10−22 atm), with 0.024% linear expansion on phase transition and 172 MPa flexural strength. Convincingly, the excellent structure stability and ionic conductivity of calcium co-doped 11SSZ compared to state-of-the-art electrolytes make them potential candidates to be used as an electrolyte for SOFC application.

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Section: Resultssupporting

confidence: 86%

“…Similarly, J.H. Joo and co-workers 25 also examined the aging rate for 1Ce10SSZ in typical anodic thermodynamic conditions of SOFC i.e. 97 vol% H 2 /3 vol% H 2 O at 800 °C.…”

mentioning

confidence: 99%

Role of Divalent Co-Dopant as Structure Stabilizer in Scandia-Stabilized Zirconia Electrolyte for SOFC

Mathur,

Shin,

Hanantyo

et al. 2023

J. Electrochem. Soc.

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“…The peak positioned at 620 cm −1 corresponds to the cubic phase and the peak at 372 cm −1 was assigned to the monoclinic phase. Other peaks are related to the tetragonal phases 36 . After the reaction with fluoride flux, phase transition occurred from cubic to tetragonal and monoclinic phases because the diffusion coefficient of the stabilizer ions in the zirconia system is higher than that of Zr ions and fluoride flux ion the penetrates the Zr site in the lattice 37 .…”

Section: Resultsmentioning

confidence: 99%

“…36 After the reaction with fluoride flux, phase transition occurred from cubic to tetragonal and monoclinic phases because the diffusion coefficient of the stabilizer ions in the zirconia system is higher than that of Zr ions and fluoride flux ion the penetrates the Zr site in the lattice. 37 In the GDC case, three peaks were obtained at 230, 455, and 660 cm −1 . The Raman spectrum of pure ceria showed only three modes around 252, 455, and 600 cm −1 .…”

Section: Phase Stability After Current Loading Testmentioning

confidence: 95%

Corrosion behavior of oxide ion conductors for high‐temperature direct electrochemical metal oxide reduction

Hwang

Shin

Lee

et al. 2020

Int J Applied Ceramic Tech

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The corrosion behaviors of high oxide ion conductors using solid oxide membrane (SOM) electrolysis were investigated in practical operating conditions (current load or molten CaF 2-NaF-CaO eutectic salt). In previous researches, yttria-stabilized zirconia (YSZ), which is widely used in SOM electrolysis due to its good mechanical properties and ionic conductivity at high temperature, has several problems including phase transition due to yttrium ion dissolution, which results in decreased current efficiency and severe fracture of SOM tube. Thus, we introduced oxide ion conductors with a higher ionic conductivity than that of YSZ to exploit its excellent current efficiency and long-term stability. In this study, we investigated the phase stability of Sr-and Mg-doped lanthanum gallate (LSGM), Sc-doped zirconia (ScSZ) and Gddoped ceria (GDC) using the structural analysis methods. Phase transition of LSGM and ScSZ easily occurred than that of GDC. GDC showed fairly tolerable stability; the molten salt ions were found only 10 μm deep on the surface, and the ions hardly penetrated the interior of bulk. However, LSGM (~40 μm) and ScSZ (~100 μm) showed a deep cation ion infiltration depth from the surface and severe surface corrosion was observed on the surface of LSGM and ScSZ.

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“…Shin et al 95 used the spin‐coating process to produce ScSZ electrolyte thin film through the invention of the sintering method via the flashlight irradiation, which minimizes post‐heat treatment time for the nano‐sized electrolytes. To improve the ionic conductivity, densification, and stability of the thin‐film structure, Yun et al 96 introduced nickel additives for modification of the ScSZ electrolyte. A solid electrolyte cell is capable of maintaining an output of up to 500 hours at an intermediate operating temperature.…”

Section: Challenge and Advance Of Scsz Electrolytementioning

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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Effects of Ni diffusion on the accelerated conductivity degradation of scandia-stabilized zirconia films under a reducing atmosphere

Cited by 18 publications

References 34 publications

Role of Divalent Co-Dopant as Structure Stabilizer in Scandia-Stabilized Zirconia Electrolyte for SOFC

Role of Divalent Co-Dopant as Structure Stabilizer in Scandia-Stabilized Zirconia Electrolyte for SOFC

Corrosion behavior of oxide ion conductors for high‐temperature direct electrochemical metal oxide reduction

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

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