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용융탄산염형 연료전지의 NiO 공기극의 용해거동에 미치는 알루미나 코팅효과에 대한 연구
류보현(Ryu, B. H.),윤성필(Yoon, S. P.),한종희(Han, J),남석우(Nam, S. W.),임태훈(lim, T.-H.),홍성안(Hong, S.-A.) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.1
The stability of alumina-coated NiO cathodes was studied in Li 0.62 /K 0.38 molten carbonate electrolyte. Alumina was effectively coated on the porous Ni plate using galvanostatic pulse plating method. The deposition mechanism of alumina was governed by the concentration of hydroixde ions near the working electrode, which was controlled by the temperature of bath solution. Alumina-coated NiO cathodes were formed to A1 2 O 3 ?NiO solid solution by the oxidation process and their Ni solubilities were were than that of NiO up to the immersion time of 100h. However, their Ni solubilities increased and were similar to that of the bare NiO cathode after 100h. It was because aluminum into the solid solution was segregated to α?LiAlO 2 on the NiO and its Product did not Play a role of the Physical barrier against NiO dissolution.
엑셀과 적산프로그램의 가용성 비교를 통한 설계변경 업무의 효율성 방안
류보현 ( Ryu Bohyeun ),전상훈 ( Jeon Sanghoon ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
Design changes are inevitable areas of work for construction engineers as they occur frequently in the construction site, and are becoming a technical measure of the technical person to the design change. In this study, the purpose is to analyze by comparing the availability of excel and the enscised program during design changes through the case, and to present the efficiency of the the Cost-of-construction Program.
용융탄산염형 연료전지에서 과전압에 미치는 전극두께의 영향
이충곤,이성윤,류보현,김도형,임희천,Lee, Choong-Gon,Lee, Sung-Yoon,Ryu, Bo-Hyun,Kim, Do-Hyung,Lim, Hee-Chun 한국전기화학회 2010 한국전기화학회지 Vol.13 No.1
This work investigated the effect of anode thickness on the anodic overpotential with $100\;cm^2$ class MCFC single cells. The hydrogen oxidation rate in the molten carbonate is sufficiently high, which may lead to weak relation of overpotential with anode geometrical area. The relation of anode surface area and overpotential was analysed in terms of anode thickness in this work. Steady state polarization, inert gas step addition (ISA), and reactant gas addition (RA) methods were employed to the two cells with 0.77 mm and 0.36 mm thickness of anode. The result represented that the anodic overpotential at the cells were identical. It implied that the anodic overpotential was independent on the electrode thickness within the tested range. 본 연구에서는 용융탄산염형 연료전지의 연료극 전극두께가 과전압에 미치는 영향을 $100\;cm^2$ 급 단위전지를 사용하여 검토하였다. 용융탄산염형 연료전지에서의 수소 산화속도는 충분히 빨라 전극면적이 성능에 크게 영향을 미치지 않을 수 있어, 본 연구에서는 전극의 기하학적 면적의 크기가 과 전압에 미치는 영향에 대해 연구하였다. 평가는 정상분극법과 비활성가스 계단형 첨가법 (ISA)와 반응물 첨가법 (RA)를 사용하여 연료극 두께 0.77 mm와 0.36 mm에 대해 수행하였다. 평가결과 두 전지에서 연료극 과전압이 거의 동일하게 관찰되어 연료극 두께에 의한 과전압의 차이는 발생하지 않았다.
침전법을 활용한 Co-Ni 전극의 제조와 용융탄산염 연료전지의 그 적용
김시열(Kim, S.Y.),류보현(Ryu, B.H.),함형철(Hahm, H.C.),한종희(Han, J.),윤성필(Yoon, S.P.),남석우(Nam, S.W.),임태훈(Lim, T.H.),이호인(Lee, H.I.) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.1
In-situ lithiated NiO has been manufactured as a conventional cathode material of molten carbonate fuel cell (MCFC), however this material has a weakness for commercialization of MCFC because NiO is spontaneously dissolved into the electrolyte under MCFC operating conditions, resulting in short circuit between cathode and anode. In this research, therefore, Co(OH)₂-coated Ni powder was prepared by precipitation method with controlling pH at low temperature and atmospheric pressure. Modified cathode was fabricated by a conventional tape casting method and sintered at 700?C in a H₂/N₂ atmosphere, Based on characterization result, Pore size distribution and porosity was suitable for the cathode of MCFC. According to the result of dissolution, Ni solubility of modified cathode was 33% lower than that of conventional cathode. In addition, modified electrode showed a good performance from the single cell operation.
전동화 시내버스 사용자 관점을 고려한 실내 난방 에너지 절감 시스템 개발
윤남석(Namseok Yun),류보현(Bohyeon Ryu),조왕현(Wanghyun Joe) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Heat pump has been applied to electric buses to improve power efficiency. The heating system of electric buses generally consists of roof-on mount type heat pump and an electric heater mounted on the floor. These two heating systems are independently operated and controlled. It should be noted that the application of independent control heat pump was not effective in improving power consumption as a result of survey. Cooperative heating control maximizes the operation duty of the heat pump without additional attention or manipulation of the driver on field driving. It has been developed and applied to our EV bus applied roof-on mount heat pump system.
천연해수에 침지된 콘크리트 내부의 철근부식거동에 미치는 염분의 영향에 관한 전기화학적 연구
김광근(KWANG-KUEN KIM),류보현(BOH-HYUN RYU),김성종(SEONG JONG KIM),김기준(KI-JOON KIM),문경만(KYUNG MAN MOON) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.4
When the concrete structures were being made with sand containing chloride ion it was well known that corrosion rate of reinforced steel embedded in concrete with chloride ion was higher than that of concrete with no chloride ion. In this study, the operation of Friedel salts affecting the corrosion behavior of reinforced steel embedded in cement mortar was investigated with electrochemical view. Corrosion potential of reinforced steel embedded in cement mortar with sand containing chloride ion was shifted noble direction than that of cement mortor with no chloride ion after immersed 5 month in natural sea water and also corrosion current density decreased with shifting corrosion potential to noble direction. However Friedel salts appeared from surface to 2.5㎝ of inside direction of mortar specimen, which is located at 11.15˚(2 θ) in XRD analysis and the amount of Ca(OH)2 by SEM photograph in cement mortar with chloride ion was larger than that of cement mortar with no chloride ion. Eventually it is suggested that Friedel salts was resulted from chloride ion and it acted as the corrosion inhibitor.
고무용 카본블랙 촉매를 이용하는 메탄분해에 의한 수소 생산
윤기준(Yoon, Ki June),류보현(Ryu, Bo Hyun),이상엽(Lee, Sang Yup),한귀영(Han, Gui Yong) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
For CO₂-free hydrogen production and better utilization of the produced carbon, catalytic decomposition of methane over rubber-grade carbon blacks manufactured from coal tar was carried out. The catalytic activities of several domestic carbon blacks were compared. A pelletized carbon black exhibited considerably lower activity and activation energy than the fluffy( loose) carbon black of the same grade. This difference is considered due to the binder that was added during pelletization. For pelletized carbon blacks, a tendency was observed that the activity per unit mass of catalyst increased with the specific surface area of the carbon black. Another tendency was also observed that the activation energy increased with the primary particle size or decrease of the specific surface area.