Effect of densification processes on the properties of plasma-sprayed YSZ electrolyte coatings for solid oxide fuel cells

Li, Chang-Jiu; Ning, Xianjin

doi:10.1016/j.surfcoat.2004.04.086

Cited by 75 publications

(28 citation statements)

References 11 publications

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“…Due to this remarkable lamellar feature, anisotropy in properties is obvious for such coating. Such anisotropic behavior in thermal, mechanical, and electrical properties of coatings has been reported [11]. Studies have shown that for the same samples of YSZ electrolyte, the ionic conductivity in the parallel direction is higher than that in the perpendicular direction [11,30].…”

Section: Resultsmentioning

confidence: 56%

“…Such anisotropic behavior in thermal, mechanical, and electrical properties of coatings has been reported [11]. Studies have shown that for the same samples of YSZ electrolyte, the ionic conductivity in the parallel direction is higher than that in the perpendicular direction [11,30]. According to the results reported by Zhang et al [30], for the same specimen of 4.5 mol% YSZ electrolyte, the ionic conductivity in the parallel direction is about twice higher than that in the perpendicular direction.…”

Section: Resultsmentioning

confidence: 67%

“…According to the results reported by Zhang et al [30], for the same specimen of 4.5 mol% YSZ electrolyte, the ionic conductivity in the parallel direction is about twice higher than that in the perpendicular direction. Regarding the deposition characteristics of YSZ and the application of YSZ in SOFCs, the ionic conductivity of YSZ coating perpendicular to the lamellae is more important than the conductivity along the lamella direction [11].…”

Section: Resultsmentioning

confidence: 99%

“…Atmospheric plasma spray is a promising method to deposit thin electrolyte film, with thickness <20 µm for planar fuel cells, for its high deposition rate, cost effectiveness, and flexibility for automated production. However, high porosity of APS-sprayed YSZ coating brought about high gas permeability and, consequently, low open circuit voltage (OCV) of SOFC [11]. Many post-densification processes have been applied to improve APS YSZ electrolyte, including acidic phosphate solution sealing [12], nitrate decomposition [11,13], sol immersion [14], laser glazing [15], and spark sintering [16].…”

Section: Introductionmentioning

confidence: 99%

“…However, high porosity of APS-sprayed YSZ coating brought about high gas permeability and, consequently, low open circuit voltage (OCV) of SOFC [11]. Many post-densification processes have been applied to improve APS YSZ electrolyte, including acidic phosphate solution sealing [12], nitrate decomposition [11,13], sol immersion [14], laser glazing [15], and spark sintering [16]. At present, many investigations have been carried out to improve the gas permeability and ionic properties of YSZ thin films using alumina addition [2,[17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of plasma-sprayed YSZ electrolytes for solid oxide fuel cells by alumina addition

Mirahmadi

Pourmalek

2010

Ionics

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Atmospheric plasma spray is a fast and economical process for deposition of yttria-stabilized zirconia (YSZ) electrolyte for solid oxide fuel cells. YSZ powders have been used to prepare plasma-sprayed thin ceramic films on the metallic substrate employing plasma spray technology at atmospheric pressure. Alumina doping was employed to improve the structural characteristics and electrical properties of YSZ. The effect of alumina addition from 1 to 5 wt.% on the properties of plasma-sprayed YSZ films was investigated. It was found that the gas permeability of the Al-doped YSZ electrolyte layer reached a level of 8.6×10 −7 cm 4 gf −1 s −1 , which is a necessary value for the practical operation of solid oxide fuel cells. Alumina doping considerably increased the ionic conductivity of plasma-sprayed YSZ. The open circuit voltage of the alumina-doped YSZ coating was approximately equal to the theoretical value for dense YSZ material.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improvement of plasma-sprayed YSZ electrolytes for solid oxide fuel cells by alumina addition

Mirahmadi

Pourmalek

2010

Ionics

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Solid oxide cell electrolytes deposited by atmospheric suspension plasma spraying at high velocity and high temperature

Kuhn

Kesler

2023

Fuel Cells

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Metal-supported solid oxide cells with Yttria-stabilized zirconia (YSZ) electrolytes fabricated by atmospheric plasma spraying are routinely found to have open-circuit voltages (OCVs) below the Nernst potential due to gas crossover and combustion resulting from electrolyte defects. To improve splat bonding and reduce coating defects, YSZ electrolytes were fabricated here at >800 • C substrate temperatures and torch-substrate relative velocities of 4 and 12 m/s by atmospheric suspension plasma spraying. Electrolyte microstructures appeared dense, with porosities estimated to be approximately 2.2-3.5 vol%. Minimal segmentation cracking was observed on samples fabricated at 12 m/s. The full cells that were electrochemically tested had permeabilities in the range of 4-6 × 10 −19 m 2 , and the maximum recorded OCV was ∼26 mV below the Nernst potential for 750 • C. Potential performance gains from YSZ deposition at substrate temperatures >800 • C may have been masked by poor substrate-fuel electrode contact. Using electrochemical impedance spectroscopy, it was found that the ohmic and polarization resistances decreased and increased, respectively, over time. The calculated distribution of relaxation times of the tested cells, together with observations from the literature, were employed to identify possible cell degradation mechanisms observed during short-term durability testing.

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Coating Characterizations

Fauchais¹,

Heberlein²,

Boulos³

2013

Thermal Spray Fundamentals

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Effect of densification processes on the properties of plasma-sprayed YSZ electrolyte coatings for solid oxide fuel cells

Cited by 75 publications

References 11 publications

Improvement of plasma-sprayed YSZ electrolytes for solid oxide fuel cells by alumina addition

Improvement of plasma-sprayed YSZ electrolytes for solid oxide fuel cells by alumina addition

Solid oxide cell electrolytes deposited by atmospheric suspension plasma spraying at high velocity and high temperature

Coating Characterizations

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