• Title/Summary/Keyword: 고체산화물전지

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Mössbauer Study of Silver Nanoparticle Coated Perovskites La0.7Sr0.3Co0.3Fe0.7O3-δ (LSCF) (은(Ag) 나노입자가 코팅된 페롭스카이트 La0.7Sr0.3Co0.3Fe0.7O3-δ의 Mössbauer 분광연구)

  • Uhm, Young-Rang;Rhee, Chang-Kyu;Kim, Chul-Sung
    • Journal of the Korean Magnetics Society
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    • v.22 no.2
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    • pp.37-41
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    • 2012
  • The Ag nanoparticles attached $La_{0.7}Sr_{0.3}Co_{0.3}Fe_{0.7}O_{3-{\delta}}$ (LSCF) perovskites were prepared by plasma method. The Ag nanoparticles with size of several nanometers deposited from the Ag target were coated on the surface of LSCF powders with size range from 0.2 to 3 ${\mu}m$. The agglomeration of Ag particles annealed at $800^{\circ}C$ under inert gas of Ar were rarely observed. The inter-diffusion between surface Ag and core LSCF is effectively strong to prevent aggregation of Ag nanoparticles. The wave number of FT-IR spectra for LSCF were largely shifted as the concentration of Ag on LSCF up to 2.11 wt.%. The ionic states of irons in LSCF were measured by M$\ddot{o}$ssbauer spectroscopy. The small amount of $Fe^{4+}$ ions are converted to $Fe^{3+}$ ions after Ag nanopartcles were coated on LSCF.

Hydrogen Production by Catalytic Reforming of $CO_2$ by $CH_4$ over Ni Based Catalysts and It's Applications (Ni계 촉매상에서 메탄에 의한 이산화탄소의 개질반응에 의한 수소제조 및 응용)

  • Moon, Dong-Ju;Kang, Jung-Shik;Ryu, Jong-Woo;Kim, Dae-Hyun;Yoo, Kye-Sang;Lee, Hyun-Joo;Kim, Hong-Gon;Lee, Sang-Deuk;Ahn, Byoung-Sung;Lee, Byung-Gwon
    • Transactions of the Korean hydrogen and new energy society
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    • v.17 no.2
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    • pp.166-173
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    • 2006
  • Catalytic reforming of $CO_2$ by $CH_4$ over Ni-YSZ based catalysts was investigated to produce syngas as raw material of high valued chemicals and develop high performance catalyst electrode for an internal reforming of $CO_2$ in SOFC system. Ni-YSZ based catalysts were prepared using physical mixing and maleic acid methods to improve catalytic activity and inhibition of carbon deposition. The catalysts before and after the reaction were characterized by $N_2$ physisorption, TPR(temperature programed reduction), XRD and impedance analyzer. The conversions for $CO_2$ and $CH_4$ over Ni-MgO catalyst showed 90% but much amount of carbon deposition was detected on catalyst surface. On the other hand, the conversions for $CO_2$ and $CH_4$ over NiO-YSZ-$CeO_2$ catalyst showed 100% and 85% respectively, and carbon deposition on catalyst surface was inhibited under the tested condition. It was concluded that NiO-YSZ-$CeO_2$ catalyst is a promising candidate for the catalytic reforming of $CO_2$ and the internal reforming in SOFC system.

Variations in the Properties of LSGM System Electrolyte with Sr and Mg Addition and Sintering Conditions (Sr과 Mg 첨가량 및 소결조건에 따른 LSGM계 전해질의 특성 변화)

  • Lee, Mi-Jai;Park, Sang-Sun;Choi, Byung-Hyun
    • Journal of the Korean Ceramic Society
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    • v.39 no.4
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    • pp.352-358
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    • 2002
  • The variations of the properties of Sr and Mg added $LaGaO_3$ system electrolyte with the amount of the additive and the sintering condition were studied. Main phase was (La$_{1-x}Sr_x)(Ga_{1-y}Mg_y)O_{3-\delta}$ phase for each compositions and the single phases $(La_{0.85}Sr_{0.15})(Ga_{0.85}Mg_{0.15})O_{3-\delta},(La_{0.85}Sr_{0.15})(Ga_{0.8}Mg_{0.2})O_{3-\delta}$ and $(La_{0.8}Sr_{0.2})(Ga_{0.8}Mg_{0.2})O{3-\delta}$ were obtained with the decrease in the sintering temperature and Mg addition. Thermal expansion coefficient of the $(La_{0.8}Sr_{0.2})(Ga_{0.8}Mg_{0.2})O_{3-\delta}$ decreased with the increase in the sintering temperature. Electric conductivity of electrolyte sintered at $1500^{circ}C$ for 1h was 0.14 S/cm at $800^{circ}C$ with 1 mA.

Influence of Gd0.1Ce0.9O2-δ Interlayer between La0.6Sr0.4Co0.2Fe0.8O3-δ Cathode and Sc-doped Zirconia Electrolyte on the Electrochemical Performance of Solid Oxide Fuel Cells (La0.6Sr0.4Co0.2Fe0.8O3-δ 공기극과 Sc이 도핑된 지르코니아 전해질 사이에 삽입한 Gd0.1Ce0.9O2-δ 중간층이 고체산화물 연료전지의 전기화학적 성능에 미치는 영향)

  • Lim, Jinhyuk;Jung, Hwa Young;Jung, Hun-Gi;Ji, Ho-Il;Lee, Jong-Ho
    • Ceramist
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    • v.21 no.4
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    • pp.378-387
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    • 2018
  • The optimal fabrication conditions for $Gd_{0.1}Ce_{0.9}O_{2-{\delta}}$(GDC) buffer layer and $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ (LSCF) cathode on 1mol% $CeO_2-10mol%\;Sc_2O_3$ stabilized $ZrO_2$ (CeScSZ) electrolyte were investigated for application of IT-SOFCs. GDC buffer layer was used in order to prevent undesired chemical reactions between LSCF and CeScSZ. These experiments were carried out with $5{\times}5cm^2$ anode supported unit cells to investigate the tendencies of electrochemical performance, Microstructure development and interface reaction between LSCF/GDC/CeScSZ along with the variations of GDC buffer layer thickness, sintering temperatures of GDC and LSCF were checked, respectively. Electrochemical performance was analyzed by DC current-voltage measurement and AC impedance spectroscopy. Microstructure and interface reaction were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Although the interfacial reaction between these materials could not be perfectly inhibited, We found that the cell, in which $6{\mu}m$ GDC interlayer sintered at $1200^{\circ}C$ and LSCF sintered at $1000^{\circ}C$ were applied, showed good interfacial adhesions and effective suppression of Sr, thereby resulting in fairly good performance with power density of $0.71W/cm^2$ at $800^{\circ}C$ and 0.7V.

Design and Performance Evaluation of Integral-type Hot BoP for Recovering High-temperature Exhaust Gas in 2 kW Class SOFC (2 kW급 고체산화물연료전지의 고온배기가스 폐열회수를 위한 일체형 Hot BoP의 설계 및 성능 평가)

  • Kim, Young Bae;Kim, Eun Ju;Yoon, Jonghyuk;Song, Hyoungwoon
    • Applied Chemistry for Engineering
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    • v.30 no.1
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    • pp.62-67
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    • 2019
  • This study was focused on the design and the performance analysis of integral Hot BoP for recovering waste heat from high-temperature exhaust gas in 2 kW class solid oxide fuel cell (SOFC). The hot BoP system was consisted of a catalytic combustor, air preheater and steam generator for burning the stack exhaust gas and for recovering waste heat. In the design of the system, the maximum possible heat transfer was calculated to analyze the heat distribution processes. The detail design of the air preheater and steam generator was carried out by solving the heat transfer equation. The hot BoP was fabricated as a single unit to reduce the heat loss. The simulated stack exhaust gas which considered SOFC operation was used to the performance test. In the hot BoP performance test, the heat transfer rate and system efficiency were measured under various heat loads. The combustibility with the equivalent ratio was analyzed by measuring CO emission of the exhaust gas. As a result, the thermal efficiency of the hot BoP was about 60% based on the standard heat load of 2 kW SOFC. CO emission of the exhaust gas rapidly decreased at an equivalent ratio of 0.25 or more.

Development of Anode-supported Planar SOFC with Large Area by tape Casting Method (테입캐스팅을 이용한 대면적 (100 cm2) 연료극 지지체식 평판형 고체산화물 연료전지의 개발)

  • Yu, Seung-Ho;Song, Keun-Suk;Song, Hee-Jung;Kim, Jong-Hee;Song, Rak-Hyun;Jung, Doo-Hwan;Peck, Dong-Hyun;Shin, Dong-Ryul
    • Journal of the Korean Electrochemical Society
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    • v.6 no.1
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    • pp.41-47
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    • 2003
  • For the development of low temperature anode-supported planar solid oxide fuel cell, the planar anode supports with the thickness of 0.8 to 1 mm and the area of 25, 100 and $150\;cm^2$ were fabricated by the tape casting method. The strength, porosity, gas permeability and electrical conductivity of the planar anode support were measured. The porosity of anode supports sintered at $1400^{\circ}C$ and then reduced in$H_2$ atmosphere was increased from $45.8\%\;to\;53.9\%$. The electrical conductivity of the anode support was $900 S/cm\;at\; 850^{\circ}C$ and its gas permeability was 6l/min at 1 atm in air atmosphere. The electrolyte layer and cathode layer were fabricated by slurry dip coating method and then had examined the thickness of $10{\mu}m$ and the gas permeability of 2.5 ml/min at 3 atm in air atmosphere. As preliminary experiment, cathode multi-layered structure consists of LSM-YSZ/LSM/LSCF. At single cell test using the electrolyte layer with thickness of 20 to $30{\mu}m$, we achieved $300\;mA/cm^2$ and 0.6V at $750^{\circ}C$

Fabrication and Performance of Anode-Supported Flat Tubular Solid Oxide Fuel Cell Unit Bundle (연료극 지지체식 평관형 고체산화물 연료전지 단위 번들의 제조 및 성능)

  • Lim, Tak-Hyoung;Kim, Gwan-Yeong;Park, Jae-Layng;Lee, Seung-Bok;Shin, Dong-Ryul;Song, Rak-Hyun
    • Journal of the Korean Electrochemical Society
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    • v.10 no.4
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    • pp.283-287
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    • 2007
  • KIER has been developing the anode-supported flat tubular solid oxide fuel cell unit bundle for the intermediate temperature($700{\sim}800^{\circ}C$) operation. Anode-supported flat tubular cells have Ni/YSZ cermet anode support, 8 moi.% $Y_2O_3$ stabilized $ZrO_2(YSZ)$ thin electrolyte, and cathode multi-layer composed of Sr-doped $LaSrMnO_3(LSM)$, LSM-YSZ composite, and $LaSrCoFeO_3(LSCF)$. The prepared anode-supported flat tubular cell was joined with ferritic stainless steel cap by induction brazing process. Current collection for the cathode was achieved by winding Ag wire and $La_{0.6}Sr_{0.4}CoO_3(LSCo)$ paste, while current collection for the anode was achieved by using Ni wire and felt. For making stack, the prepared anode-supported flat tubular cells with effective electrode area of $90\;cm^2$ connected in series with 12 unit bundles, in which unit bundle consists of two cells connected in parallel. The performance of unit bundle in 3% humidified $H_2$ and air at $800^{\circ}C$ shows maximum power density of $0.39\;W/cm^2$ (@ 0.7V). Through these experiments, we obtained basic technology of the anode-supported flat tubular cell and established the proprietary concept of the anode-supported flat tubular cell unit bundle.