• Title/Summary/Keyword: Ni/YSZ

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Current Collector Effects on High Temperature Electrolysis by NI-YSZ Cermet Supported Solid Oxide Cells (집전체에 따른 NI-YSZ Cermet 기반의 가역적 고체산화물 연료전지를 이용한 고온 수증기 전기분해 특성)

  • Shin, Eui-Chol;Ahn, Pyung-An;Seo, Hyun-Ho;Lee, Jong-Sook;Yu, Ji-Haeng;Woo, Sang-Kuk
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.6
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    • pp.533-539
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    • 2010
  • Ni-YSZ supported button cells were prepared by spray-coating YSZ and screen-printing YSZ-LSM powder as an electrolyte and oxygen electrode on Ni-YSZ cermet disks. In order to identify the polarization loss mechanism in high temperature electrolysis current-voltage characteristics coupled with electrochemical impedance spectroscopy were investigated as a function of temperature, current load, and the humidity. The effects of the different current collectors of platinum and silver for oxygen electrodes were compared. With Ag current collector two polarization losses were distinguished. The high frequency component was attributed to the Ni-YSZ cermet which was less susceptible to temperature variation but increasing in loss with humidity. The lower frequency component was attributed to the LSM electrode. Platinum current collector led to a much lower polarization loss.

Anode-supported Solid Oxide Fuel Cells Prepared by Spin-coating (Spin-coating 공정에 의해 제조된 음극 지지형 고체산화물 연료전지)

  • Yu, Ji-Haeng;Lee, Hee-Lak;Woo, Sang-Kuk
    • Journal of the Korean Ceramic Society
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    • v.44 no.12
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    • pp.733-739
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    • 2007
  • NiO-YSZ anode-supported single cell was prepared by spin-coating YSZ and LSM slurries as electrolyte and cathode, respectively. Dense YSZ electrolyte film was successfully prepared on the porous NiO-YSZ anode substrate by tuning pre-sintering temperature of NiO-YSZ and co-firing temperature. The thickness of YSZ film was controlled by the solid content of slurry and coating cycles. The experimental conditions affecting on the thickness of YSZ film was discussed. Single cells with the active electrode area ${\sim}0.8\;cm^2$ were prepared by spin-coating the cathode layers of LSM-YSZ mixture and LSM consequently as well. The effects of the pre-sintering temperature and thus the microstructure of NiO-YSZ substrate on the current-voltage characteristics of co-fired cell were investigated.

A Study on the Improvement of Strength in NiO-YSZ Porous Anode Material for Solid Oxide Fuel Cell (SOFC용 다공성 NiO-YSZ 음극소재의 강도향상에 관한 연구)

  • 이기성;서두원;유지행;우상국
    • Journal of the Korean Ceramic Society
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    • v.40 no.3
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    • pp.241-248
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    • 2003
  • We controlled the amount of Y$_2$O$_3$additives, 8 mol% and 10 mol%, and the type of carbon pore former, activated carbon and carbon black, to improve the strength of porous NiO-YSZ anode materials for solid oxide fuel ceil. The 3-point flexural strength, porosity and electrical conductivity were evaluated. As a result, the strength of anode materials with the addition of carbon black was markedly improved. The strength of NiO-10 mol%YSZ sintered at relatively higher temperature was higher than that of NiO-8 mol%YSZ materials. The electrical conductivity of NiO-10 mol%YSZ with carbon black was evaluated as much as 10$^2$∼10$^3$S/cm at 700$^{\circ}C$∼1000$^{\circ}C$ in reducing atmosphere.

Microstructural Characteristics of Ni/YSZ Cermet for High Temperature Electrolysis by Mechanical Alloying (기계적 합금화법으로 제조된 고온 수전해용 Ni/YSZ 전극의 미세구조 특성)

  • Park Keun-Man;Chae Ui-Seok;Hong Hyun Seon;Choo Soo-Tae
    • Korean Journal of Materials Research
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    • v.14 no.10
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    • pp.743-748
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    • 2004
  • Modified Ni/YSZ cermets for high temperature electrolysis were synthesized by the direct ball milling of Ni and YSZ powder. The ball milling was carried out in dry process and in ethanol with varying milling time. While the dry-milling decreased the average size from 65 to $80{\mu}m$, the wet-milling decreased the average size down to $10{\mu}m$. In addition, very fine particles less than $0.1{\mu}m$ were observed in the wet-milling condition. The subsequent process of cold-pressing and sintering at $900^{\circ}C$ for 2 h did not affect the particle size of dry-milled powder. The electrical conductivity of the dry-milled Ni/YSZ cermet showed the value of $5{\times}10^{2}\;S/cm$ and this value was increased to $1.4{\times}10^{4}\;S/cm$ after the sintering at $900^{\circ}C$ for 2 h.

A Study on the Reaction Characteristics of Steam Reforming Reaction over Catalyzed Porous Membrane (다공성 촉매 분리막을 이용한 수증기 개질 반응 특성 연구)

  • Hong, Sung Chang;Lee, Sang Moon
    • Applied Chemistry for Engineering
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    • v.25 no.2
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    • pp.198-203
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    • 2014
  • In this study, steam reforming reaction and surface characteristics of Ni metal foam plate were investigated. Valence state of Ni could be changed by pretreatment, and metallic Ni species exposed on surface as a active site play important role in steam reforming reaction. Porous catalytic membrane also was prepared by mixing of Ni metal foam plate and Ni-YSZ catalyst to control the pore size and assign the catalytic function in Ni metal foam plate. In SEM analysis results, Pore size of Ni metal foam plate could be controlled and Ni-YSZ catalyst well dispersed on surface. Ni based porous catalytic membrane had a similar steam reforming activity regardless of space velocity.

YSZ(yttria-stablilized ziroconia) 박막을 이용한 센서셀의 산소감응

  • 배정운;박준용;황순원;김기동;조영아;전진석;최동수;염근영
    • Proceedings of the Korean Vacuum Society Conference
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    • 1999.07a
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    • pp.128-128
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    • 1999
  • 산소이온 전도체로 잘 알려진 Yttira-Stabilizd Ziroconia(TSZ)는 연료전지, oxygen pumps, chemical gas sensor 등 다양한 electrochemical divices에 이용되는 고체 전해질의 하나이다. 특히 YSZ는 oxygen 및 oxygen과 평형상태에 있는 gas들을 검출하는 sensor의 electrolyte로서 가장 많이 쓰이고 있다. 현재 상용화되어 있는 YSZ Sensor는 전통적인 bulk 형태의 ceramic으로 제작된 것으로 충분한 ionic conductivity를 얻기 위해서는 $600^{\circ}C$이상의 operating temperature를 필요로 하나 YSZ를 박막으로 제조시 낮은 operating temperature를 뿐만 아니라 sensor의 소형화, 낮은 ohmic loss 및 다양한 응용이 가능한 장점을 가질 수 있다. 본 실험에서는 산소 이온 전도체로서 8mol%-YSZ 고체전해질을 RF-magnetron bias sputtering 법을 이용하여 증착하였다. 제조된 YSZ 박막을 이용한 산소감응 센서셀 구조는 SiO2/Ni-NiO/Pt/YSZ/Pt-기판이다. 센서셀의 정상상태에서의 기전력(electromotive force ; EMF)을 산소분압(Po:1.013$\times$103Ta ~1.013$\times$105Pa)과 측정온도(30$0^{\circ}C$~$700^{\circ}C$)를 변화시키며 측정하였다. 이론적인 기전력과 측정값 사이의 편차는 Po:1.565$\times$104Pa 이하의 산소분압에서는 컸지만 이 이상의 분압에서는 이론치에 근접한 값을 가졌다. 증착한 YSZ와 Ni-NiO 박막의 구조는 X-ray diffractometer(XRD)를 이용하여 결정구조를 알아 보았고, TSZ 박막의 표면 morphology 관찰은 Scanning electron microscopy(SEM) 이용하였다. 박막의 조성분석은 X-ray energy dispersive analysis(EDX)을 사용하였다.

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Characteristics of LaCo1-xNixO3-δ Coated on Ni/YSZ Anode using CH4 Fuel in Solid Oxide Fuel Cells

  • Kim, Jun Ho;Jang, Geun Young;Yun, Jeong Woo
    • Journal of Electrochemical Science and Technology
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    • v.11 no.4
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    • pp.336-345
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    • 2020
  • Nickel-doped lanthanum cobalt oxide (LaCo1-xNixO3-δ, LCN) was investigated as an alternative anode material for solid oxide fuel cells. To improve its catalytic activity for steam methane reforming (SMR) reaction, Ni2+ was substituted into Co3+ lattice in LaCoO3. LCN anode, synthesized using the Pechini method, reacts with yttria-stabilized zirconia (YSZ) electrolyte at high temperatures to form an electrochemically inactive phase such as La2Zr2O7. To minimize the interlayer by-products, the LCN was coated via a double-tape casting method on the Ni/YSZ anode as a catalytic functional layer. By increasing the Ni doping amount, oxygen vacancies in the LCN increased and the cell performance improved. CH4 fuel decomposed to H2 and CO via SMR reaction in the LCN functional layer. Hence, the LCN-coated Ni/YSZ anode exhibited better cell performance than the Ni/YSZ anode under H2 and CH4 fuels. LCN with 12 mol% of Ni (LCN12)-modified Ni/YSZ anode showed excellent long-term stability under H2 and CH4 conditions.

Promoter Effect on Ni/YSZ Anode Catalyst of Solid Oxide Fuel Cell for Suppressing Coke Formation in the Methane Internal Reforming (고체산화물 연료전지용 Ni/YSZ 음극 촉매에서의 메탄 내부개질 반응 시 탄소 침적 억제를 위한 첨가제 영향)

  • Kim, Hye-Roung;Choi, Ji-Eun;Youn, Hyun-Ki;Chung, Jong-Shik
    • Korean Chemical Engineering Research
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    • v.46 no.4
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    • pp.813-818
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    • 2008
  • Various additives were added in small amounts on Ni/YSZ anode of SOFC (solid oxide fuel cell) in order to improve reactivity and to inhibit deactivation due to coke deposition during methane reforming using a low mole ratio steam ($H_2O/CH_4=1.5$) at $800^{\circ}C$. Ni/YSZ catalysts added with various perovskites did not show any improvement but exhibited a gradual decrease in the methane conversion. K-doped Ni/YSZ showed a steady increase and maintenance of the conversion up to 42 hours, after which there was an abrupt deactivation of catalyst owing to potassium loss by volatilization. Addition of 5% of $K_2Ti_2O_5$ on Ni/YSZ showed a stable maintenance of the conversion without K loss, and was able to prevent coke formation during a long time operation. Deactivation of catalyst during the reaction was mainly caused by the accumulation of graphidic carbon on the catalyst surface.

Optimization of anode and electrolyte microstructure for Solid Oxide Fuel Cells (고체산화물 연료전지 연료극 및 전해질 미세구조 최적화)

  • Noh, Jong Hyeok;Myung, Jae-ha
    • Korean Chemical Engineering Research
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    • v.57 no.4
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    • pp.525-530
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    • 2019
  • The performance and stability of solid oxide fuel cells (SOFCs) depend on the microstructure of the electrode and electrolyte. In anode, porosity and pore distribution affect the active site and fuel gas transfer. In an electrolyte, density and thickness determine the ohmic resistance. To optimizing these conditions, using costly method cannot be a suitable research plan for aiming at commercialization. To solve these drawbacks, we made high performance unit cells with low cost and highly efficient ceramic processes. We selected the NiO-YSZ cermet that is a commercial anode material and used facile methods like die pressing and dip coating process. The porosity of anode was controlled by the amount of carbon black (CB) pore former from 10 wt% to 20 wt% and final sintering temperature from $1350^{\circ}C$ to $1450^{\circ}C$. To achieve a dense thin film electrolyte, the thickness and microstructure of electrolyte were controlled by changing the YSZ loading (vol%) of the slurry from 1 vol% to 5 vol. From results, we achieved the 40% porosity that is well known as an optimum value in Ni-YSZ anode, by adding 15wt% of CB and sintering at $1350^{\circ}C$. YSZ electrolyte thickness was controllable from $2{\mu}m$ to $28{\mu}m$ and dense microstructure is formed at 3vol% of YSZ loading via dip coating process. Finally, a unit cell composed of Ni-YSZ anode with 40% porosity, YSZ electrolyte with a $22{\mu}m$ thickness and LSM-YSZ cathode had a maximum power density of $1.426Wcm^{-2}$ at $800^{\circ}C$.

Fracture Characteristics of NiCr/ZrO2 Functionally Graded Material by Gas Burner Thermal Shock (가스버너 열충격에 의한 NiCr/ZrO2계 경사기능재의 열적 파괴특성)

  • Song, Jun-Hee
    • Journal of the Korean Ceramic Society
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    • v.43 no.4 s.287
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    • pp.247-252
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    • 2006
  • Joining Yittria Stabilized Zirconia (YSZ) to NiCr metal was fabricated using YSZ/NiCr Functionally Graded Materials (FGM) Interlayer by hot pressing process. Microscopic observations demonstrate that the composition and microstructure of YSZ/NiCr FGM distribute gradually in stepwise way, eliminating the macroscopic ceramic/metal interface such as that in traditional ceramic/metal joint. The thermal characteristics of this YSZ/FGM/NiCr joint were studied by thermal shock testing and therml barrier testing. Thermal shock test was conducted by gas burner rig. Acoustic Emission (AE) monitoring was performed to analyze the microfracture behavior during the thermal shock test. It could be confirmed that FGM was the excellent performance of thermal shock/barrier resistance at above $1000^{\circ}C$.