중온형 고체전해질 연료전지용 전해질 개발

임형렬,이주성,정순기 한양대학교 에너지 ·환경기술연구소 1995 에너지·環境技術論文集 Vol.2 No.-

고체전해질형 연료전지의 작동온도를 낮추기 위해 고체전해질인 ??를 고상반응법으로 제조하여 그 전기화학적 특성을 살펴보았으며 소결온도 및 첨가제 함량이 이온전도도에 미치는 영향에 대해서도 고찰하였다. 1500℃에서 10시간동안 소결한 ??의 경우 Yb₂O₃의 함량이 ZrO₂에 대해 8㏖%일 때 가장 뛰어난 특성을 보여 890℃, 공기 중에서 ??의 이온전도도를 나타내었다. ?? were prepared by solid state reaction and its electrochemical characteristics were investigated to lower the operating temperature of solid oxide fuel cell. Also the effects of sintering temperature and additive content on ionic conductivity were studied. In case of ?? sintered at 1500℃ for 10hr, the best characteristics were showed when x is 0.08 and the value was ?? at 890℃ in air.

고체전해질형 연료전지용 전해질 제작 및 La_1-xSr_xMnO₃의 특성에 관한 고찰

임형렬,이주성,Rim, Hyung-Ryul,Lee, Ju-Seong 한국공업화학회 1996 공업화학 Vol.7 No.1

고체전해질형 연료전지용 전해질로 사용되는 8mol% YSZ($Y_2O_3$ stabilized zirconia)의 소결조건을 변화시켜 이온전도도를 측정하였다. 그 결과 소결조건이 $1400^{\circ}C$, 10시간이었을 때 가장 높은 값인 $10^{-1}S.cm^{-1}$를 나타내었다. 또한 산소극재료로서 $La_{1-x}Sr_xMnO_3$($0{\leq}{\times}{\leq}1$)를 고상반응법으로 제조하여 과전압, 전자 전도도, 전해질인 YSZ와의 계면저항등을 살펴보았다. 그 결과 La에 대한 Sr의 치환량이 50mol%일 때 가장 우수한 특성을 나타내었다. Solid oxide electrolytes of 8mol% YSZ($Y_2O_3$ stabilized zirconia) were prepared at various sintering conditions and their ionic conductivities were measured. The highest ionic conductivity of $10^{-1}S.cm^{-1}$ was obtained when the sintering temperature was 1400oC and the sintering time was 10hr. Also the cathode material, $La_{1-x}Sr_xMnO_3$ was prepared by solid state reaction method and the overpotential, electrical conductivity, and charge transfer resistance between cathode material and YSZ electrolyte were studied. It was found that the optimum doping content of Sr for La was 50mo1%.

고체전해질형 연료전지용 전해질 제작 및 La1 - xSrxMnO3 의 특성에 관한 고찰

임형렬,이주성 ( Hyung Ryul Rim,Ju Seong Lee ) 한국공업화학회 1996 공업화학 Vol.7 No.1

고체전해질형 연료전지용 전해질로 사용되는 8㏖% YSZ(Y₂O₃ stabilized zirconia)의 소결조건을 변화시켜 이온전도도를 측정하였다. 그 결과 소결조건이 1400℃, 10시간이었을 때 가장 높은 값인 10^(-1)S.㎝^(-1)를 나타내었다. 또한 산소극재료로서 La_(1-)Sr_xMnO₃(0≤X≤1)를 고상반응법으로 제조하여 과전압, 전자전도도, 전해질인 YSZ와의 계면저항 등을 살펴보았다. 그 결과 La에 대한 Sr의 치환량이 50㏖%일 때 가장 우수한 특성을 나타내었다. Solid oxide electrolytes of 8㏖% YSZ(Y₂O₃ stabilized zirconia) were prepared at various sintering conditions and their ionic conductivities were measured. The highest ionic conductivity of 10^(-1)S.㎝^(-1) was obtained when the sintering temperature was 1400℃ and the sintering time was 10hr. Also the cathode material, La_(1-x)Sr_xMnO₃, was prepared by solid state reaction method and the overpotential, electrical conductivity, and charge transfer resistance between cathode material and YSZ electrolyte were studied. It was found that the optimum doping content of Sr for La was 50㏖%.

Fabrication of heteroatom doped cobalt catalyst for oxygen reduction and evolution reactions in alkaline medium

Ahmed Sheraz,Rim Hyung‐Ryul,Sun Ho‐Jung,Lee Hong‐Ki,Shim Joongpyo,Park Gyungse 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.5

The application of heteroatom doped cobalt (Ni@Co/C) prepared from a porous metal–organic framework as the cathode material for the rechargeable zinc–air batteries has been demonstrated. The Ni@Co/C-modified electrode showed an excellent catalytic activity toward oxidation–reduction reaction and oxygen evolution reactions. The Co/C catalysts, which were Co particle impregnated on graphitic carbon powders, were synthesized after the calcination of Co3 (SDA)3(DMF)2 precursor, and then Ni deposition (Ni@Co/C) was followed on it by chemical reduction. Linear sweep voltammetry measurement indicates that Ni@Co/C-H800, which had Ni particles on Co/C derived from MOF at 800 C under N2, exhibited excellent performance. The stable charging/discharging profiles at 20 mA cm2 of current were obtained for the 350 h in alkaline medium, suggesting Ni@Co/C-H800 as a potential candidate for oxidation– reduction and evolution reactions.

고체전해질형 연료전지용 Pr_1-xM_xMnO₃(M-Ca, Sr) 산소극 재료의 특성

임형렬,정순기,이주성,Rim, Hyung-Ryul,Jeong, Soon-Ki,Lee, Ju-Seong 한국공업화학회 1996 공업화학 Vol.7 No.6

고체전해질형 연료전지의 산소극 재료로서 페롭스카이트 구조를 갖는 $PrMnO_3$에 Ca과 Sr을 도핑시켜 도핑량에 따른 전기전도도, 산소환원과전압 등의 전기화학적 특성과, 전해질인 yttria stabilized zirconia와의 반응성 그리고 열 팽창률 등을 살펴 보았다. 합성된 페롭스카이트 분말은 대략 $2{\sim}5{\mu}m$의 평균입자 크기를 나타내었는데 이때 입자크기 및 비표면적은 도핑량과 무관하였다. Ca이 30mo1% 도핑되었을 때 전기전도도는 $1000^{\circ}C$에서 $266S{\cdot}cm^{-1}$로 가장 높은 값을 나타내었고, 분극을 통해 살펴 본 산소환원특성도 Ca이 30mol% 도핑되었을 때 가장 우수한 특성을 나타내었다. 전극물질과 전해질인 YSZ를 $1200^{\circ}C$에서 100시간 동안 반응시킨 결과 $PrMnO_3$에 Sr을 도핑시켰을 때보다 Ca을 도핑시킨 것이 반응성이 훨씬 약한 결과를 나타내었다. $Pr_{0.7}Ca_{0.3}MnO_3$의 열팽창계수는 $300{\sim}1000^{\circ}C$의 영역에서 $1.19{\times}10^{-5}K^{-1}$로 측정되었고 이 값은 YSZ의 열팽창계수 $1.15{\times}10^{-5}K^{-1}$과 유사한 값이었다. Ca or Sr-doped $PrMnO_3$ were prepared for cathode material of solid oxide fuel cell. The characteristics such as the electrical conductivity and the cathodic overpotential were investigated as to doping contents. Also the reactivity with yttria stabilized zirconia of electrolyte, and the thermal expansion coefficient were studied. The prepared perovskite powder had the mean particle size of $2{\sim}5{\mu}m$, and the particle size and the surface area was out of relation to the doping content. When Ca doping amount of electrode material was 30mol%, the electrical conductivity was the highest value of $266S{\cdot}cm^{-1}$ at $1000^{\circ}C$, and also the polarization characteristics showed the best property. The reactivity between YSZ and Ca-doped $PrMnO_3$ at $1200^{\circ}C$ for 100hours was lower than that between YSZ and Sr-doped $PrMnO_3$. The thermal expansion coefficient of $Pr_{0.7}Ca_{0.3}MnO_3$ was $1.19{\times}10^{-5}K^{-1}$ in the temperature range of $300{\sim}1000^{\circ}C$, and this value was similar to that of YSZ, $1.15{\times}10^{-5}K^{-1}$.

고체전해질형 연료전지용 Pr0.7Ca0.3MnO3 의 특성 고찰

임형렬,심중표,정윤이,이주성 ( Hyung Ryul Rim,Joong Pyo Shim,Eun Ey Jung,Ju Seong Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1997 No.0

중온형 고체전해질 연료전지용 MCe1-xGdxO3-x/2 ( M=Mg , Ca , Ba ) 전해질의 특성 고찰

임형렬,정순기,이주성 ( Hyung Ryul Rim,Soon Ki Jeong,Ju Seong Lee ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2

Development of Electrode Structure via Loading Pt Catalysts on PTFE/C Powder by Colloidal Method in PAFC

Lee, Ju Seong,Rim, Hyung Ryul,Park, Jung Il,Shim, Jae Cheol,Yoo, Duck Young,Kim, Jo Woong 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.2

Inside electrodes fabricated by a conventional method, inactive catalysts exist because catalysts were covered with polytetrafluoroethylene (PTFE). To reduce the inactive catalysts and develop a better electrode structure, the procedure of mixing the materials was changed. To begin with, PTFE/C powder was manufactured. Pt catalysts were then loaded on the PTFE/C powder. For loading the Pt catalysts on carbon blacks, a colloidal method was used. The porosities, pore areas, and performances of the electrodes were examined by a porosimeter and an electrochemical measurement apparatus. The electrodes fabricated by the new method were superior to those fabricated by the conventional method. In particular, the performance of the former, was 390 mA/㎠ at 0.7 V (vs. RHE) compared with that of the latter of 250 mA/㎠ at 0.7 V (vs. RHE).

연구발표 초록 ( 공업화학 (Ⅱ) ) : 인산형 연료전지의 다공성전극중 조촉매의 활성효과

임형렬,엄승욱,이주성 ( Hyung Ryul Rim,Seung Wook Eom,Ju Seong Lee ) 한국화학공학회 1991 추계학술발표회 Vol.- No.-

고체전해질형 연료전지용 Pr1 - xMxMnO3 ( M=Ca , Sr ) 산소극 재료의 특성

임형렬,정순기,이주성 ( Hyung Ryul Rim,Soon Ki Jeong,Ju Seong Lee ) 한국공업화학회 1996 공업화학 Vol.7 No.6

고체전해질형 연료전지의 산소극 재료로서 페롭스카이트 구조를 갖는 PrMnO₃에 Ca과 Sr을 도핑시켜 도핑량에 따른 전기전도도, 산소환원과전압 등의 전기화학적 특성과, 전해질인 yttria stabilized zirconia와의 반응성 그리고 열팽창률 등을 살펴 보았다. 합성된 페롭스카이트 분말은 대략 2∼5μm 평균입자 크기를 나타내었는데 이때 입자크기 및 비표면적은 도핑량과 무관하였다. Ca이 30mol% 도핑되었을 때 전기전도도는 1000℃에서 266S·cm^(-1)로 가장높은 값을 나타내었고, 분극을 통해 살펴 본 산소환원특성도 Ca이 30mol% 도핑되었을 때 가장 우수한 특성을 나타내었다. 전극물질과 전해질인 YSZ를 1200℃에서 100시간 동안 반응시킨 결과 PrMnO₃에 Sr을 도핑시켰을 때보다 Ca을 도핑시킨 것이 반응성이 훨씬 약한 결과를 나타내었다. Pr_(0.7)Ca_(0.3)MnO₃의 열팽창계수는 300∼1000℃의 영역에서 1.19×10^(-5)K^(-1)로 측정되었고 이 값은 YSZ의 열팽창계수 1.15×10^(-5)K^(-1)과 유사한 값이었다. Ca or Sr-doped PrMnO₃ were prepared for cathode material of solid oxide fuel cell. The characteristics such as the electrical conductivity and the cathodic overpotential were investigated as to doping contents. Also the reactivity with yttria stabilized zirconia of electrolyte, and the thermal expansion coefficient were studied. The prepared perovskite powder had the mean particle size of 2∼5μm, and the particle size and the surface area was out of relation to the doping content. When Ca doping amount of electrode material was 30mol%, the electrical conductivity was the highest value of 266 S·cm^(-1) at 1000℃, and also the polarization characteristics showed the best property. The reactivity between YSZ and Ca-doped PrMnO₃ at 1200℃ for 100hours was lower than that between YSZ and Sr-doped PrMnO₃. The thermal expansion coefficient of Pr_(0.7)Ca_(0.3)MnO₃ was 1.19×10^(-5)K^(-1) in the temperature range of 300∼1000℃, and this value was similar to that of YSZ, 1.15×10^(-5)K^(-1).