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고분자 전해질 연료전지 촉매층 바인더를 위한 Sulfonated Fluorenyl Poly(ether sulfone)에 관한 연구
조원재,이미순,이연식,윤영기,최영우,Cho, Won Jae,Lee, Mi Soon,Lee, Youn Sik,Yoon, Young Gi,Choi, Young Woo 한국전기화학회 2016 한국전기화학회지 Vol.19 No.2
연료전지에서 산소 환원 반응 (ORR)은 전체 반응에서 지배적인 역할을 한다. 또한 서로 다른 물질로 이루어진 막과 바인더 간의 낮은 호환성은 연료전지 효율을 크게 감소시킨다. 이러한 두 가지 문제점을 고려하여, 본 연구에서는 기존의 일반적인 Biphenol 대신 입체적 구조를 갖는 9,9_Bis(4-hydroxyphenyl) fluorine를 이용한 고분자를 합성하여 각각의 전극 바인더를 제조하였고, 이를 이용하여 각각의 나피온 막과 탄화수소 막 위에 스프레이 기법으로 MEA를 제조하여 전기화학적 성능 평가를 진행하였다. 그 결과 전류-전압 곡선에서의 0.6 V의 성능이 두 종류의 다른 막을 적용 했을 때 큰 차이를 보이지 않았으며, 탄화 수소 막의 타펠 기울기의 정도가 나피온 막에 비해 현저히 낮았다. 이를 통해 본 연구에서 적용된 아이오노머 바인더가 연료 전지성능 향상에 더 기여할 수 있을 것으로 판단 된다. Oxygen reduction reaction in the fuel cell (ORR) plays a dominant role in the overall reaction. In addition, the low compatibility between the membrane and the binder consisted of different materials, greatly reduces the efficiency of the fuel cell performance. In view of these two problems, geometrically modified copolymers with 9.9_Bis (4-hydroxyphenyl) were synthesized via condensation reaction instead of conventional biphenol and were adopted as hydrocarbon ionomer binders. By utilizing these binders, two kinds of MEAs using fluorinated Nafion membrane and hydrocarbon based membrane were manufactured in order to electrochemical performance evaluation. With current-voltage curves, there was no significant difference in the 0.6 V when two types of membrane were applied. Also, tafel slope became considerably lower as compared to the Nafion membrane. Thus, it is determined that the new hydrocarbon binder is expected to contribute the improvement in performance of fuel cells.
조원재 한국원자력산업회의 1985 원자력산업 Vol.5 No.9
장기적으로 우라늄의 공급이 안정될 수 있고 전체적으로 볼때 전력생산비가 낮아질 수 있다는 설명을 듣고 보니 더욱 원자력발전소에 대한 인식이 달라졌다.
조원재,강민지,김승안,김태은,장서영,조은혜 한국과학영재교육학회 2023 과학영재교육 Vol.15 No.1
On this study, we produced an educational experimental kit for classifying reagents by manufacturing a simplified polarimeter. Actual polarimeters are generally less accessible for using. Thus, we used polarizers and acrylics to produce an educational experimental kit. In this study, we measured the photoactivity of reagents, and the error range was less than ±1°. Additionally, we automated the process of measuring photoactivity by using arduino. It is expected that this kit can be used as an experimental tool to predict results in advance before using an actual polarimeter in the future. 본 연구에서는 광학 이성질체의 광학적 특징을 살펴보고 간이 편광계를 제작해, 시약을 분류하는 교육용 실험 키트를 제작하였다. 기존의 사용하는 편광계는 값이 너무 비싸고 전문적인 지식 없이는 쉽게 사용할 수 없다. 따라서 문제점을 극복하고자 편광판과 아크릴을 이용해 교육용 실험 키트를 제작하였다. 본 실험에서는 R-Limonene, S-Limonene, D-Glucose, D-Fructose, D-Sucrose을 이용하여 간이 편광계로 광회전도를 측정하는 실험을 진행하였는데 이론적 광회전도와 측정 광회전도의 오차범위가 ±1° 미만으로 나타나 상당히 높은 정확도를 보였다. 특히 선행연구에서 제작한 간이 편광계에선 수집한 데이터를 엑셀과 미분 프로그램을 사용해 직접 처리하는 다소 복잡한 과정을 본 연구에서는 아두이노를 이용해 프로그램을 작성하여 측정부터 결과 도출까지 모두 자동화시켰다. 후속연구에선 지금보다 물질의 광회전도를 더 정확하게 측정할 방법을 고안하는 연구가 진행되었으면 한다
조원재,이미순,최영우,김창수,이연식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The sulfonated poly(arylene ether sulfone) (SPES) with comparable proton conductivity compared to Nafion have being developed because that have some advantage such as low manufacturing cost and gas permeability, and high glass transition temperature. The purpose of this study is to to increase oxygen reduction reaction on the sulfonated poly(arylene ether sulfone) binder in a fuel cell. The M-SPESs with the various degree of sulfonation (i.e. 20, 30, 40, and 50) were prepared to compare their phisyco-chemical properties.
조원재,이미순,김창수,최영우,이연식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The perfluorinated sulfonated acids(PFSA) ionomers(e.g Nafion) have been applied due to their excellent performances despite of their disadvantages like high costs and environmental problems. To overcome the Nafion``s disadvantages, sulfonated poly(aryl ether) sulfones are remarkable candidates due to their outstanding advantages such as low manufacturing costs and high glass transition temperature. In this study, fluorenyl SPAES was adapted as catalyst binder in order to improve oxygen reduction reaction on cathodic reaction and confirmed with electrochemical performances such as IV curve, impedance spectroscopy and CV.
조원재,윤숙자,윤민중,ChO, Won-Je,Sook-Ja Yoon,,Yoon, Min-Joong 한국광과학회 2005 Journal of Photosciences Vol.12 No.1
Application of a new photocatalyst has been attempted to improve the efficiency and rates of photocatalytic degradation of azo dyes by using a model dye such as Methyl Orange. As a new photocatalyst, $TiO_2$ encapsulated EFAL-removed zeolite Y ($TiO_2$ /EFAL-removed zeolite Y) has been synthesized by ion-exchange in the mixture of EFAL-removed zeolite Y with 0.05 M aqueous [$(NH_4)_2 TiO(C_2O_4)_2.H_2O$] [$TiO(C_2O_4)_2.H_2O$]. This new photocatalyst has been characterized by measuring XRD, IR and reflectance absorption spectra as well as ICP analysis, and it was found that the framework structure of $TiO_2$ /EFAL-removed zeolite Y is not changed by removing the extra-framework aluminum (EFAL) from the normal zeolite Y and the $TiO_2$ inside the photocatalyst exists in the form of $(TiO^{2+})_n$ nanoclusters. Based on the ICP analysis, the Si/Al ratio of the $TiO_2$ /EFAL-removed zeolite Y and the weight of $TiO_2$ were determined to be 23 and 0.061g in 1.0g photocatalyst, respectively. It was also found that adsorption of the azo dye in the $TiO_2$ /EFAL-removed zeolite is very effective (about 80 % of the substrate used). This efficient adsorption contributes to the synergistic photocatalytic activities of the $TiO_2$ /EFAL-removed zeolite by minimizing the required flux diffusion of the substrate. Thus, the photocatalytic reduction of methyl orange (MO) was found to be 8 times more effective in the presence of $TiO_2$ /EFAL-removed zeolite Y than in the presence of $TiO_2$ /normal zeolite Y. Furthermore, the photocatalytic reduction of MO by using 1.0 g of the $TiO_2$ /EFAL-removed zeolite Y containing 0.061g of $TiO_2$ is much faster than that carried out by using 1.0 g of Degussa P-25.
조원재(Won-Jae Cho),황아름(A-Reum Hwang),김상우(Sang-Woo Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.7
금속이 코팅된 FBG(fiber Bragg grating) 센서는 구조물이 과거에 겪은 최대 변형률을 기억하는 기억효과(memory effect)를 가진다. 본 연구에서는 무전해 도금법과 전해 도금법을 이용하여 약 43μm의 두께를 가지는 니켈(nickel)이 코팅된 FBG 센서를 제작하였다. 니켈 코팅된 FBG 센서의 잔류 변형률 생성성능, 즉, 기억효과를 검증하기 위해 반복하중 실험(잔류 변형률 생성실험)을 수행하였다. 인가한 최대 변형률의 크기가 증가함에 따라 잔류 변형률이 증가함을 확인함으로써 기억효과를 검증하였다. 본 연구에서 수행한 니켈이 코팅된 FBG 센서의 제작 기법과 센서에 대한 반복하중 실험결과는 향후 광섬유 센서를 이용한 구조물 건전성 감시(SHM, structural health monitoring)기법 개발에 기본 데이터로서 활용될 것이다. A metal-coated FBG (fiber Bragg grating) sensor has a memory effect, which can recall the maximum strains experienced by the structure. In this study, a nickel-coated FBG sensor was fabricated through electroless (i.e., chemical plating) and electroplating. A thickness of approximately 43 μm of a nickel layer was achieved. Then, we conducted cyclic loading tests for the fabricated nickel-coated FBG sensors to verify their capability to produce residual strains. The results revealed that the residual strain induced by the nickel coating linearly increased with an increase in the maximum strain experienced by the sensor. Therefore, we verified that a nickel-coated FBG sensor has a memory effect. The fabrication methods and the results of the cycle loading test will provide basic information and guidelines in the design of a nickel-coated FBG sensor when it is applied in the development of structural health monitoring techniques.