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Pulsed constant voltage electrophoretic deposition of YSZ electrolyte coating on conducting porous Ni–YSZ cermet for SOFCs applications.

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Title: Pulsed constant voltage electrophoretic deposition of YSZ electrolyte coating on conducting porous Ni–YSZ cermet for SOFCs applications.
Authors: Oskouyi, Omid Ekhlasi1, Shahmiri, Mohammad1, Maghsoudipour, Amir1,2 am.maghsoudipour@gmail.com, Hasheminiasari, Masood1
Source: Journal of Alloys & Compounds. May2019, Vol. 785, p220-227. 8p.
Subjects: Physical constants, Electrophoretic deposition, Electrolytes, Porous materials, Nickel alloys
Abstract: Abstract In the present investigation, solid oxide fuel cells (SOFCs) electrolyte coatings of 8 mol% Y 2 O 3 stabilized ZrO 2 (YSZ) are applied on Ni-YSZ cermet fuel cell anode in ethanol by pulsed constant voltage-electrophoretic deposition (EPD). Press pressure and sintering temperature as two of the most effective parameters for NiO-YSZ composite fabrication are investigated. In order to create electrically conductive anodes, NiO-YSZ composite is reduced in H 2 atmosphere while its crystallinity being studied by X-ray diffraction (XRD). Pulsed constant voltage EPD process parameters such as pulse width, applied voltage and total deposition time are examined. The YSZ electrolyte film is sintered for 4 h at two different temperatures of 1300 and 1350 C°. Optical microscope (OM) is used to study the surface quality of coating. Substrate morphology and the quality of YSZ electrolyte film are investigated by scanning electron microscope (SEM). Atomic force microscopy (AFM) is used to probe the surface roughness and the morphology of green and sintered coatings. Results show improved deposition yield by increasing applied voltage and total deposition time. Uniform and dense coating was deposited at voltage of 35 V, pulse width of 1 ms, 50% duty cycle and total deposition time of 6 min having the thickness and roughness of about 17 ± 1 μm and 166 ± 5 nm, respectively. Highlights • Dense YSZ electrolyte coating were deposited on porous Ni–YSZ cermet by pulsed constant voltage EPD process instead of DC EPD. • The only phase change occurred during NiO-YSZ composite reduction is NiO to metallic Ni with 98.9% reduction efficiency. • Dense YSZ electrolyte were obtained at voltage of 35 V, pulse width of 1 ms, and total deposition time of 6 min. • The optimal thickness and roughness of YSZ coating were 17 ± 1 μm and 166 ± 5 nm, respectively. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract In the present investigation, solid oxide fuel cells (SOFCs) electrolyte coatings of 8 mol% Y 2 O 3 stabilized ZrO 2 (YSZ) are applied on Ni-YSZ cermet fuel cell anode in ethanol by pulsed constant voltage-electrophoretic deposition (EPD). Press pressure and sintering temperature as two of the most effective parameters for NiO-YSZ composite fabrication are investigated. In order to create electrically conductive anodes, NiO-YSZ composite is reduced in H 2 atmosphere while its crystallinity being studied by X-ray diffraction (XRD). Pulsed constant voltage EPD process parameters such as pulse width, applied voltage and total deposition time are examined. The YSZ electrolyte film is sintered for 4 h at two different temperatures of 1300 and 1350 C°. Optical microscope (OM) is used to study the surface quality of coating. Substrate morphology and the quality of YSZ electrolyte film are investigated by scanning electron microscope (SEM). Atomic force microscopy (AFM) is used to probe the surface roughness and the morphology of green and sintered coatings. Results show improved deposition yield by increasing applied voltage and total deposition time. Uniform and dense coating was deposited at voltage of 35 V, pulse width of 1 ms, 50% duty cycle and total deposition time of 6 min having the thickness and roughness of about 17 ± 1 μm and 166 ± 5 nm, respectively. Highlights • Dense YSZ electrolyte coating were deposited on porous Ni–YSZ cermet by pulsed constant voltage EPD process instead of DC EPD. • The only phase change occurred during NiO-YSZ composite reduction is NiO to metallic Ni with 98.9% reduction efficiency. • Dense YSZ electrolyte were obtained at voltage of 35 V, pulse width of 1 ms, and total deposition time of 6 min. • The optimal thickness and roughness of YSZ coating were 17 ± 1 μm and 166 ± 5 nm, respectively. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2019.01.166