$LaCoC_3$ 산화물의 에탄올 감지특성에 미치는 CaO의 영향

임병오,손태원,양천회,Rim, Byung-O,Shon, Tai-Won,Yang, Chun-Hoi 한국안전학회 1988 한국안전학회지 Vol.3 No.2

The perovskite-type compounds $La_{1-x}Ca_xCoO_3$ were synthesized, their thermochemical properties and the gaseous sensitivity were investigated in ethanol vapor. The maximum response for detecting gas corresponded with the exothermic peak of DTA experiment. In any case the substituent was increased, the responsive ratio for detecting gas was grown upon. However, the needed time for response was later, and the operating temperature was elevated. The mechanism of this electrical conductivity was explained by the oxygen ionic diffusion through oxygen vacancy produced by the substituent.

스피넬상 $Li{Mn_2}{O_4}$를 이용한 $CO_2$ 분해의 최적조건

이동석,임병오,양천회,이풍헌,Lee, Dong-Suek,Rim, Byung-O,Yang, Chun-Hoe,Lee, Poong-Hun 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.10

이산화탄소 분해를 위한 촉매 $Li{Mn_2}{O_4}$는 졸-겔법에 의해서 망간아세테이트와 수산화리튬을 출발물질로 사용하여 $150^{\circ}C$의 공기분위기에서 12시간 동안의 건조과정과 $480^{\circ}C$에서 12시간 동안의 열처리과정을 통해서 합성하였다. 합성한 촉매를 수소환원시키기 위해서 다른 온도에서 수소($H_2$)로 3시간동안 환원하였고, 이 수소에 의해 환원된 촉매를 이용해 $300^{\circ}C$, $325^{\circ}C$, $350^{\circ}C$, $375^{\circ}C$, $400^{\circ}C$에서 이산화탄소($CO_2$) 분해율을 조사하였다. 실험결과 수소환원과 이산화탄소 분해의 온도최적조건은 $350^{\circ}C$임을 알 수 있었다. 합성촉매를 포함해 수소에 의한 환원과 이산화탄소분해 후 촉매에 대하여 XRD분석, SEM관찰, TGA 분석을 하였다. The spinel $Li{Mn_2}{O_4}$ catalysts for $CO_2$ decomposition were synthesized by a sol-gel method using manganese acetate and lithium hydroxide as starting materials through drying at $150^{\circ}C$ for 12 hrs under oxygen atmosphere followed by heat treatment at $480^{\circ}C$ for 12 hrs. The synthesized $Li{Mn_2}{O_4}$ were reduced by hydrogen for 3 hrs at various temperatures and the decomposition rate of carbon dioxide was investigated at 300, 325, 350, 375 and $400^{\circ}C$ using the $Li{Mn_2}{O_4}$ reduced by hydrogen gases. As a result of experiment, the optimum temperature of hydrogen reduction and $CO_2$ decomposition was shown $350^{\circ}C$. The physicochemical properties of the spinel $Li{Mn_2}{O_4}$ the reduced $Li{Mn_2}{O_4}$ and the $Li{Mn_2}{O_4}$ after $CO_2$ decomposition were examined with XRD, SEM and TGA.

폴리에틸렌 필름으로 포장된 두부의 보관수명 예측을 위한 수치모사

김재능,임병오,손태원,정귀영 ( Jai Neung Kim,Byung O Rim,Tae Won Shon,Gui Yung Chung ) 한국공업화학회 1998 공업화학 Vol.9 No.6

CO₂ 분해용 스피넬상 LiMn₂O₄ 에 대한 Fe₃O₄ 첨가효과

양천모(Chun Mo Yang),임병오(Byung O Rim),김승호(Seung Ho Kim),김순태(Soon Tae Kim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3

The spinel LiMn₂O₄ powders were synthesized at 480℃ for 12 h in air by a sol-gel method using managanese acetate and lithium hydroxide as starting material and the Fe₃O₄ powders were synthesized by the precipitation method using 0.2M-FeSO₄·H₂O and 0.5M-NaOH. The synthesized Fe₃O₄ powders were mixed at portion of 5, 10, 15 and 20 wt% about LiMn₂O₄ powders through ball-milling followed by drying at room temperature for 48 h in air. The mixed catalysts were reduced at 350℃ for 3 h by hydrogen and the decomposition rate of carbon dioxide was measured at 350℃ using the reduced catalysts. As the results of CO₂ decomposition experiments, the decomposition rates of carbon dioxide were 85% in all catalysts but the initial decomposition rates of CO₂ were slightly high in the case of the 5%-Fe₃O₄ added catalyst.

CO₂ 분해용 촉매 CuO-Magnetite 및 ZnO-Magnenetite 합성

양천모(Yang Chun Mo),임병오(Rim Byung O) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.2

The Cuo-Magnetite and ZnO-Magnetite catalysts with various of Cuo and ZnO mole% for Carbon Dioxide decomposed reaction synthesized. The catalysts were reduced by H₂ at 350℃ for 3 hours. The temperature was obtained by TGA and DSC experiments. The structures of catalysts were confirmed by X-ray diffraction experiment. The surface area of catalysts is 15~27 m²/g. The results of Carbon Dioxide decomposed ability was better H₂-reduced magnetite catalysts with 0.03 mole% CuO and 0.03 mole% ZnO than others catalysts. After Carbon Dioxide decomposed reaction, catalysts were reacted H₂ and created only methane.

CuO-Magnetite 및 ZnO-Magnetite 촉매상에서 $CO_2$ 수식 이미지 분해반응속도론

양천모(Yang, Chun-Mo),임병오(Rim, Byung-O) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.4

$Cu_xFe_{3-x}O_4$ 수식 이미지 catalyst and $Zn_xFe_{3-x}O_4$ 수식 이미지 catalyst were synthesized by the air oxidation method with various C(II) and Zn(II) weights. Activated catalysts decomposed carbon dioxide to carbon at $350^{\circ}C$ 수식 이미지, $380^{\circ}C$ 수식 이미지, $410^{\circ}C$ 수식 이미지 and $440^{\circ}C$ 수식 이미지. The value of carbon dioxide decomposition rate for $Cu_{0.003}Fe_{2.997}O_4$ 수식 이미지 and $Zn_{0.003}Fe_{2.997}O_4$ 수식 이미지 catslysts than was better catalysts. The decomposed rate of the catalysts is about 85%${\sim}$ 수식 이미지90%. The reaction rate constant(4.00 $psi^{1-{\alpha}}/min$ 수식 이미지) and activation energy(2.62 kcal/mole) of $Cu_{0.003}Fe_{2.997}O_4$ 수식 이미지 catalyst are better than $Zn_{0.003}Fe_{2.997}O_4$ 수식 이미지

CO2 분해용 스피넬상 LiMn2O4 에 대한 Fe3O4 첨가효과

양천모(Chun Mo Yang),임병오(Byung O Rim),김승호(Seung Ho Kim),김순태(Soon Tae Kim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3

N/A The spinel LiMn_2O_4 powders were synthesized at 480℃ for 12 h in air by a sol-gel method using managanese acetate and lithium hydroxide as starting material and the Fe_3O_4 powders were synthesized by the precipitation method using 0.2M-FeSO_4·H_2O and 0.5M-NaOH. The synthesized Fe_3O_4 powders were mixed at portion of 5, 10, 15 and 20 wt% about LiMn_2O_4 powders through ball-milling followed by drying at room temperature for 48 h in air. The mixed catalysts were reduced at 350℃ for 3 h by hydrogen and the decomposition rate of carbon dioxide was measured at 350℃ using the reduced catalysts. As the results of CO_2 decomposition experiments, the decomposition rates of carbon dioxide were 85% in all catalysts but the initial decomposition rates of CO_2 were slightly high in the case of the 5%-Fe_3O_4 added catalyst.

유기전해질에 따른 EDLC의 전기화학적 특성

양천모,이중기,조원일,조병원,임병오,Yang Chun-Mo,Lee J.K.,Cho W.I.,Cho B.W.,Rim Byung-O 한국전기화학회 2001 한국전기화학회지 Vol.4 No.3

탄소계 전극을 사용하는 EDLC(Electric Double Layer Capacitor)용의 축전용량과 충방전속도는 전해질의 종류, 충방전 조건 그리고 탄소계 물질의 물리화학적 성질에 따라 크게 달라질 수 있다. 이에 본 연구에서는 dip coating method에 의해 제조된 EDLC용 활성탄소 전극에서 유기 전해질의 종류를 달리하여 충방전 실험과 전기화학적인 실험을 시행하였다. 또한 충전전류밀도와 방전전류밀도의 변화에 따른 비축전 용량의 변화를 조사하였고, 최적 유기전해질의 조건에서 leakage current 특성, 자가방전 특성 그리고 시간전압곡선을 기존의 $1M-Et_4NBF_4/PC$와 비교하였다 활성탄, 소전극으로 비표면적이 $2000m^2/g$인 MSP-20을 사용하고 유기전해질로는 $1M-LiPF_6/PC-DEC(1:1)$를 사용한 EDLC에서 130 F/g 정도의 우수한 비축전 용량을 나타내었고 저항면에서도 가장 낮은 수치를 나타내었다 $1M-LiPF_6/PCDEC(1:1)$를 사용한 EDLC는 15분동안 0.0004A의 낮은 leakage current와 100시간 경과 후 0.8V의 우수한 자가 방전 특성 그리고 IR-drop이 적은 선형의 시간-전압곡선을 보여주었다. Specific capacitance and charge-discharge rate of EDLC using activated carbon electrode were affected by the compositions of electrolytes, the conditions of charge-discharge and physical properties of activated carbon materials. The activated carbon electrode was prepared by dip coating method. Charge-discharge test and electrochemical experiments were carried out for various kinds of organic electrolytes. Effects of charge and discharge current density on the specific capacitance were studied. Characteristics of leakage current, self-discharge and time-voltage curves in optimum conditions of organic electrolytes were compared with conventional $1M-Et_4NBF_4/PC$ electrolyte. The EDLC using MSP-20(specific surface area: $2000m^2/g$) electrode and $1M-LiPF_6/PC-DEC(1:1)$ was exhibited th highest specific capacitance of 130F/g and low polarization resistances. The EDLC using MSP-20 electrode at $1M-LiPF_6/PC-DEC(1:1)$ was small leak current of 0.0004A for 15min, long voltage retention of 0.8V after 100h and linear time-voltage curves with small IR-drop.

CO$_2$ 수식 이미지 분해용 촉매 CuO-Magnetite 및 ZnO-Magnenetite 합성

양천모(Yang, Chun-Mo),임병오(Rim, Byung-O) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.2

The Cuo-Magnetite and ZnO-Magnetite catalysts with various of Cuo and ZnO mole% for Carbon Dioxide decomposed reaction synthesized. The catalysts were reduced by $H_2$ 수식 이미지 at $350^{\circ}C$ 수식 이미지 for 3 hours. The temperature was obtained by TGA and DSC experiments. The structures of catalysts were confirmed by X-ray diffraction experiment. The surface area of catalysts is $15{\sim}27\;m^2/g$ 수식 이미지. The results of Carbon Dioxide decomposed ability was better $H_2-reduced$ 수식 이미지 magnetite catalysts with 0.03 mole% CuO and 0.03 mole% ZnO than others catalysts. After Carbon Dioxide decomposed reaction, catalysts were reacted $H_2$ 수식 이미지 and created only methane.

활성탄소 전극의 제조공정에 따른 EDLC의 전기화학적 특성

양천모,김현중,조원일,조병원,윤경석,임병오,Yang Chun-Mo,Kim H.J.,Cho W.I.,Cho B.W.,Yun K.S.,Rim Byung-O 한국전기화학회 2001 한국전기화학회지 Vol.4 No.3

EDLC(electric double layer capacitor)용 활성탄소전극의 제조공정을 dip coating method, doctor blade coating method, paste rolling method로 달리하여 전기화학적 특성과 비축전 용량을 조사하였다. Dip coating method에 의한 전극제조시 전해질염으로 LiPF6를 이용하고 유기용매로 PC-DEC를 이용한 EDLC의 비축전 용량이 130F/g으로 가장 우수하였고, 선형의 시간전압곡선에서의 IR-drop도 0.11V로 작았으며 CV(cyclic voltammetry) 분석 또한 이상적인 EDLC의 특성을 나타내었다. The electrochemical characteristics and specific capacitance were investigated by preparation processes (dip coating method, doctor blade coating method and paste rolling method) of activated carbon electrode for an EDLC(electric double layer capacitor). The EDLC using $LiPF_6$ salts and PC-DEC solvents showed good specific capacitance, 130F/g and small IR-drop at linear time-voltage curve. 0.11V, Cyclic voltammetry analysis using the activated carbon electrode prepared by dip coating method was shown closer to ideal EDLC characterization.