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Carbon/PVC 복합전극의 제조 및 전 바나듐계 레독스-흐름전지에의 응용
유철휘,장인영,정현철,김종철,강안수 대한안전경영과학회 2002 대한안전경영과학회 학술대회논문집 Vol.2002 No.11
All-vanadium redox flow battery(VRFB) has been studied actively as one of the most promising electrochemical energy storage systems for a wide range of applications such as electric vehicles, photovoltaic arrays, and excess power generated by electric power plants at night time. CPCS has been shown to have the characteristics as an excellent current collector for VRFB and electrochemical properties of specific resistivity 0.31 Ω cm, which were composed of G-1028 80 wt%, PVC 10 wt%, DBP 5 wt% and FS 5 wt%. Energy efficiencies of VRFB with the CPCE and the existing electrode assembly were 84.14 % and 77.24 % respectively, in charge/discharge experiments at constant current of 200 mA, and the CPCE was confirmed to be suitable as the electrode of VRFB.
유철휘,강성구,김진배,황갑진 한국수소및신에너지학회 2015 한국수소 및 신에너지학회논문집 Vol.26 No.1
The secondary battery using sodium is investigating as one of power storage system and power inelectric vehicles. The secondary battery using sodium as a sodium battery and sodium ion battery had merits suchas a abundant resources, high energy density and safety. Sodium battery (sodium molten salt battery) is operatedat lower temperature (100℃) compared to NAS and ZEBRA battery (300~350℃). Sodium ion battery isinvestigating as one of the post lithium ion battery. In this paper, it is explained for the principle and recent researchtrends in sodium molten salt and sodium ion battery.
유철휘,김종수,박대흠,정영관 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.5
The bubbles made of hydrogen and oxygen gases producted by electrolysis disturb the electrolysis,but the behavior of these bubbles in the electrolysis stack isn't clearly defined. In order to study on the behavior of bubbles in the flow pattern of the meshes type separator, the flow visualization experiment was performed by using of a visible alkaline electrolysis stack and a stereoscopic microscope. As the results, a fine size bubbles adhered to the separator's surface in the electrolyte solution have grown large sized bubbles until each bubble's buoyance is lager than the sum of surface adhesion force and weight. And then the large bubbles flow into the upper area of the separator. Also, as wide area of the separator have been occupied by various sized bubbles,the electrolysis efficiency is declined.
나일채,조홍식,유철휘,황갑진 한국막학회 2014 멤브레인 Vol.24 No.5
두 종류의 막(다공성 막, 양이온교환막)을 사용하여 아연-브롬 레독스-흐름 전지(ZBRFB, Zn-Br redox-flow battery)의 성능을 평가하였다. ZBRFB의 성능평가는 20mA/cm2의 전류밀도에서 진행하였다. 다공성 막인 SF-600을 사용한 ZBRFB의 기전력(SOC 100%에서의 OVC)은 1.87 V, 양이온교환막인 Nafion117 막을 사용한 ZBRFB의 기전력은 1.93 V를 나타냈다. 각 막을 사용한 ZBRFB의 성능은 7회 충 방전 실험을 진행하여 평가하였다. SF600 막을 사용한 ZBRFB의 평균 전류효율은 89.76%, 평균 전압효율은 83.46%, 평균 에너지효율은 74.88%를 나타냈으며, Nafion117 막을 사용한 ZBRFB의 평균 전류효율은 97.7%, 평균 전압효율은 76.33%, 평균 에너지효율은 74.56%를 나타냈다. Two commercial membranes (porous membrane and cation exchange membrane) were evaluated as a separator in the Zn-Br redox-flow battery (ZBRFB). The performance properties of ZBRFB were test in the current density of 20mA/cm2. The electromotive forces (OCV at SOC 100%) of ZBRFB using SF-600 (porous membrane) and Nafion 117 (cation exchange membrane) were 1.87 V and 1.93 V, respectively. The cycle performance of ZBRFB using each membrane was evaluated during 7 cycles. The performance of ZBRFB using SF-600 membrane was 89.76%, 83.46% and 74.88% for average current efficiency, average voltage efficiency and average energy efficiency, respectively. The performance of ZBRFB using Nafion117 membrane was 97.7%, 76.33% and 74.56% for average current efficiency, average voltage efficiency and average energy efficiency, respectively.
최호상,유철휘,황갑진 한국막학회 2010 멤브레인 Vol.20 No.3
IS (요오드-황)프로세스의 HI 분해반응 공정에서의 적용을 목적으로 지르코니아 코팅 지지체를 이용하여 CVD법에 의해 수소분리막을 제작하였으며, 분리막으로서의 가능성을 평가하였다. 제작한 막의 형상 및 Si의 분포를 파악하기 위해 SEM 및 EPMA를 이용하여 분석하였다. 지르코니아를 코팅한 지지체를 이용하여 제작한 막에 Zr-Si-O층이 존재한다는 것을 알 수 있었다. 제작한 막의 수소와 질소가스의 단일 성분 투과속도를 300~600℃에서 측정하였다. 600℃에서 Z-1막에서의 수소투과속도는 1 x 10 -7 mol·Pa -1·m -2·s -1를 나타냈다. 질소에 대한 수소의 선택성은 Z-1 막에서 5.0, Z-2막에서 5.75를 나타냈다. The hydrogen permselective membrane were prepared by chemical vapor deposition (CVD) aiming at the applications to hydrogen iodide decomposition in the thermochemical IS process, and it was evaluated for the possibility as a separation membrane. An electron probe X-ray microanalyzer (EPMA) and SEM picture were used to analyze the morphology and structure of the prepared membranes. It was confirmed that Zr-Si-O layer exist in the surface of the prepared membrane using zirconia coated support. Single-component permeance to H2 and N2 were measured at 300~600℃. Hydrogen permeance through the Z-1 membrane at a permeation temperature of 600℃ was about 1 x 10 -7 mol·Pa -1·m -2·s -1. The selectivities of H2/N2 at 600℃ were 5.0 and 5.75 for Z-1 and Z-2 membrane, respectively.
장수연,유철휘,황갑진 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.4
In order to evaluate the possibility as a separator in alkaline water electrolysis, the high temperature characteristics were evaluated by measuring the membrane resistance and durability of 5 types of commercial anion exchange membranes in 7 M KOH solution and at 80℃. The membrane resistance of AEM membrane measured in 7 M KOH solution and at 80℃ had a lower value of about 8-24 times compared to the other membranes. The durability of AEM membrane tested with the soaking time in 7 M KOH solution and at 80℃ showed a very good stability and that of FAAM40 and FAAM75-PK showed secondly a good stability. The thermal stability with the soaking time in 7 M KOH solution and at 80℃ of FAAM40 and FAAM75-PK membrane analyzed by thermo-gravimetric analysis showed a good stability compared to the other membranes.
이온 치환된 제올라이트를 활용한 양이온 제거에 관한 연구
황갑진,유철휘,이경한,구경모,한주영 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
산업 폐기물과 생활하수로 인한 물의 오염은 지속적으로 문제가 되고 있으며, 특히 미량의 금속류와 암모니아성 질소 등은 기존의 정수처리방법으로는 더 이상의 처리가 곤란하다는 문제점을 갖고 있다. 이에 대한 해결방안으로 저렴한 비용과 고효율성 및 2차적인 환경오염을 최소화 할 수 있는 이점을 가지는 활성탄, 화산재, 점토류 및 제올라이트가 주목받고 있다. 제올라이트는 골격구조에 따라 양이온 선호도를 갖는 특성을 가져 선택적으로 양이온 교환이 가능하며, 구조적 특성과 뛰어난 이온교환능력 및 높은 흡착력, 특정 이온에 대한 높은 선택성으로 인해 선택적 중금속제거를 위한 흡착제로서 많은 관심을 받고 있다. 본 연구에서는 천연 입상 제올라이트를 K<sup>+</sup>, Na<sup>+</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup>로 이온치환을 진행한 후 이온 치환된 제올라이트를 이용하여 양이온의 제거에 대한 연구를 진행하였다. 양이온의 제거는 시간에 따른 제거율과 흡착량을 분석함으로써 진행하였다.
전 바나듐계 레독스-호름전지의 응용을 위한 양이온 교환막의 제조
강안수,유철휘,이한섭 용인대학교 자연과학연구소 1996 自然科學硏究所論文誌 Vol.1 No.1
Redox-flow battery has been studied actively as one of the most promising electrochemical energy storage systems for a wide range of applications such as electric vehicles, photovoltaic arrays, and excess power generated by electric power plants. By employing the same active material in both half-cell electrolytes, problems of cross-contamination inherent in other types of redox flow batteries, such as the Fe/Cr system, are eliminated in the all vanadium systems. To date, Selemion CMV and Nafion 117 as the cation exchange membrane have been the most widely used material in the research and development of all vanadium redox- flow battery. Despite of excellent results, the long-term stability of the Selemion CMV membrane in the all vanadium redox-flow battery is limited by the oxdizing nature of vanadium and Nafion 117 is too expensive. To solve these problems, the developement of cation exchange membrane that possess good chemical stability, high permselectivity and relatively inexpensive in comparison with the commercial membranes, is necessary. Based on 16, 20, 40, 50 and 60 ㎛ thickness polyethylene film as a starting membrane, the cation exchange membranes were prepared by chlorosulfonation reaction under irradiation ultraviolet. The PE-16(polyethylene of 16 ㎛ thickness) as a separator of all vanadium redox-flow battery which was obtained by the chlorosulfonation for 60 minutes under the irradiation of UV intensity 22,000 lux, showed the best result with electrical areal resistivity 0.61 Ω·㎠, transport number 0.97 and ion exchange capacity 0.8752.