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전사지를 이용한 다전지식 평관형 고체산화물 연료전지 제작 및 셀 특성
안용태,지미정,박선민,신상호,황해진,최병현,An, Yong-Tae,Ji, Mi-Jung,Park, Sun-Min,Shin, Sang-Ho,Hwang, Hae-Jin,Choi, Byung-Hyun 한국재료학회 2013 한국재료학회지 Vol.23 No.3
In the segmented-in-series solid-oxide fuel cells (SIS-SOFCs), fabrication techniques which use decalcomania paper have many advantages, i.e., an increased active area of the electrode; better interfacial adhesion property between the anode, electrolyte and cathode; and improved layer thickness uniformity. In this work, a cell-stack was fabricated on porous ceramic flattened tube supports using decalcomania paper, which consists of an anode, electrolyte, and a cathode. The anode layer was $40{\mu}m$ thick, and was porous. The electrolyte layers exhibited a uniform thickness of about $20{\mu}m$ with a dense structure. Interfacial adhesion was improved due to the dense structure. The cathode layers was $30{\mu}m$ thick with porous structure, good adhesion to the electrolyte. The ohmic resistance levels at 800, 750 and $700^{\circ}C$ were measured, showing values of 1.49, 1.58 and $1.65{\Omega}{\cdot}cm^2$, respectively. The polarization resistances at 800, 750 and $700^{\circ}C$ were measured to be 1.63, 2.61 and $4.17cm^2$, respectively. These lower resistance values originated from the excellent interfacial adhesion between the anode, electrolyte and cathode. In a two-cell-stack SOFC, open-circuit voltages(OCVs) of 1.915, 1.942 and 1.957 V and maximum power densities(MPD) of 289.9, 276.1 and $220.4mW/cm^2$ were measured at 800, 750 and $700^{\circ}C$, respectively. The proposed fabrication technique using decalcomania paper was shown to be feasible for the easy fabrication of segmented-in-series flattened tube SOFCs.
Ni-Fe/YSZ 코어-쉘 구조 연료극을 사용한 다전지식 고체산화물 연료전지의 전기화학적 특성
안용태,지미정,황해진,이민진,홍선기,강영진,최병현,An, Yong-Tae,Ji, Mi-Jung,Hwang, Hae-Jin,Lee, Min-Jin,Hong, Sun-Ki,Kang, Young-Jin,Choi, Byung-Hyun 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
An Ni-Fe/YSZ core-shell structured anode for uniform microstructure and catalytic activity was synthesized. Flat tubular segmented-in-series solid oxide fuel cell-stacks were prepared by decalcomania method using synthesized anode powder. The Ni-Fe/YSZ core-shell anode exhibited better electrical conductivity than a commercially available Ni-YSZ cermet anode. Also power output increased by 1.3 times with a higher open circuit voltage. These results can be attributed to the uniformly distributed Ni particles in the YSZ framework. The impedance spectra of a Ni-Fe/YSZ core-shell anode showed comparable reduced ohmic resistance similar to those of the commercially available Ni-YSZ cermet anodes.
전사지를 이용 적층한 셀 구조 및 연료극 기능층 형성에 따른 출력 특성
안용태,지미정,구자빈,최진훈,황해진,최병현,An, Yong-Tae,Ji, Mi-Jung,Gu, Ja-Bin,Choi, Jin-Hoon,Hwang, Hae-Jin,Choi, Byung-Hyun 한국재료학회 2012 한국재료학회지 Vol.22 No.11
The properties of SOFC unit cells manufactured using the decalcomania method were investigated. SOFC unit cell manufacturing using the decalcomania method is a very simple process. In order to minimize the ohmic loss of flattened tube type anode supports of solid oxide fuel cells(SOFC), the cells were fabricated by producing an anode function layer, YSZ electrolyte, LSM electrode, etc., on the supports and laminating them. The influence of these materials on the power output characteristics was studied when laminating the components and laminating the anode function layer between the anode and the electrolyte to improve the output characteristics. Regarding the performance of the SOFC unit cell, the output was 246 $mW/cm^2$ at a temperature of $800^{\circ}C$ in the case of not laminating the anode function layer; however, this value was improved by a factor of two to 574 $mW/cm^2$ due to the decrease of the ohmic resistance and polarization resistance of the cell in the case of laminating the anode function layer. The outputs appeared to be as high as 574 and 246 $mW/cm^2$ at a temperature of $800^{\circ}C$ in the case of using decalcomania paper when laminating the electrolyte layer using the in dip-coating method; however, the reason for this is that interfacial adhesion was improved due to the dense structure, which leads to a thin thickness of the electrolyte layer.
P<sub>2</sub>O<sub>5</sub>-SnO<sub>2</sub>계 유리에서 용융분위기에 따른 구조와 물성에 미치는 영향
안용태,최병현,지미정,권용진,배현,황해진,An, Yong-Tae,Choi, Byung-Hyun,Ji, Mi-Jung,Kwon, Yong-Jin,Bae, Hyun,Hwang, Hae-Jin 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2
In this study, tin phosphate glass system($SnO_2-(1-x)P_2O_5-xB_2O_3$) that occur during the melting of the metal oxide inhibition of the oxidation reaction, and to reduce oxides of high melting temperature in the following three methods were melting. The first is the general way in the atmosphere, and the second by injecting $N_2$ gas under a neutral atmosphere, and finally in the air were melted by the addition of a reducing agent Melt in the atmosphere when the oxidation of the metal oxide is inhibited by low temperatures were melting. In addition, the deposition of crystals within glassy or inhibit devitrification phenomenon is also improved over 80% transmittance. This phenomenon, when the melting of glass, many of $Sn^{4+}$ ions are reduced to the $Sn^{2+}$ was forming oxides SnO, because it acts as a modifier oxide.
SOFC anode용 나노구형 Ni<sub>(1-x)</sub>-M<sub>(x=0~0.15)</sub>(M=Co, Fe) alloy 분말 합성 및 그 특성
이민진,최병현,지미정,안용태,홍선기,강영진,황해진,Lee, Min-Jin,Choi, Byung-Hyun,Ji, Mi-Jung,An, Young-Tae,Hong, Sun-Ki,Kang, YoungJin,Hwang, Hae-Jin 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
In this study, the reducing agent hydrazine and precipitator NaOH were used with $NiCl_2$ as a starting material in order to compound Ni-based material with spherical nano characteristics; resulting material was used as an anode for SOFC. Synthetic temperature, pH, and solvent amounts were experimentally optimized and the synthesis conditions were confirmed. Also, a 0 ~ 0.15 mole ratio of metal(Co, Fe) was alloyed in order to increase the catalyst activation performance of Ni and finally, spherical nano $Ni_{(1-x)}-M_{(x=0{\sim}0.15)}$(M = Co, Fe) alloy materials were compounded. In order to evaluate the catalyst activation for hydrocarbon fuel, fuel gas(10%/$CH_4$+10%/Air) was added and the responding gas was analyzed with GC(Gas Chromatography). Catalyst activation improvement was confirmed from the 3% hydrogen selectivity and 2.4% methane conversion rate in $Ni_{0.95}-Co_{0.05}$ alloy; those values were 4.4% and 19%, respectively, in $Ni_{0.95}-Fe_{0.05}$ alloy.
GNP 법을 이용한 저온형 SOFC용 (BaSr)(CoFe)O_3 공기극의 제조 및 특성 평가
이미재(Lee, Mi-Jai),문지웅(Moon, Ji-Woong),김세기(Kim, Sei-Ki),지미정(Ji, Mi-Jung),황해진(Hwang, Hae-Jin),임용호(Lim, Yong-Ho),최병현(Choi, Byung-Hyun) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
Cathode material, (Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-{delta}}, for low temperature SOFC was prepared by the glycine-nitrate synthesis process (GNP). The characteristics of the synthesized powders were studied with controlling pH of a precursor. The synthesis BSCF powders with pH were agglomeration state and calcinations temperature has not influence on particles. Highly acidicprecursor solution increased a single phase forming the temperature. Also, synthesis BSCF powder was show result for thermal analysis and alteration of difference crystal with pH. It is considered that Ba and Sr cannot complex by carboxylic acid group of glycine, because under highly acidic condition the caboxylic group mainly combined with H^+ insead of alkali and alkaline earth cations. In case of using precursor solution with pH 2{sim}3, a single perovskite phase was obtained at 1000?C. Polarization resistance of (Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-{delta}} was measured by AC impedance spectroscopy from the two electrode symmetric cell. Area specific resistance of the (Ba_{0.5}Sr_{0.5})_{0.99}Co_{0.8}Fe_{0.2}O_{3-{delta}} air electrode at 500?C;and;600?C were 0.96{Omega}?cm² and 0.16{Omega}?cm², respectively.
SnO<sub>2</sub>-(1-x)P<sub>2</sub>O<sub>5</sub>-xB<sub>2</sub>O<sub>3</sub> 유리의 열적, 구조적 특성
안용태,최병현,지미정,장우석,배현,황해진,An, Yong-Tae,Choi, Byung-Hyun,Ji, Mi-Jung,Chang, Woo-Suk,Bae, Hyun,Hwang, Hae-Jin 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.2
$SnO_2-(1-x)P_2O_5-xB_2O_3$ glass system were prepared by melt-quenching technique in the compositional series containing 50, 55 and 60 mol% of $SnO_2$. Local structure of the glasses was investigated by Raman and FT-IR measurements. A large glass-forming region was found at the phosphate side of the ternary system with homogeneous glasses containing up to 5~25 mol% of $B_2O_3$. According as content of $B_2O_3$ increases, theraml expansion coefficient of glass decreased but transition temperature and softening temperature increased. Because these phenomenon changed local structure of glass. According as content of $B_2O_3$ increases, quantity of bridging oxygen increased. Also, according as content of $SnO_2$ increases, confirmed that quantity of non-bridging oxygen increases.