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Nano-composite Ni-GDC anode functional layer for low-temperature solid oxide fuel cells
전옥성,이진구,박명근,현상훈,장정석,설용건 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Low temperature solid oxide fuel cells (LT-SOFCs) are favorable for various applications. However, low power density is considered as a main obstacle for LT-SOFCs. The anode part and the interface between anode and electrolyte can significantly contribute to increasing power density at low temperatures. In this study, the nano-composite Ni-Gd0.1 Ce0.9O1.95(Ni-GDC) anode functional layer (AFL) powder is prepared for LT-SOFCs with high power density. In hydrogen condition, the maximum power density of 0.98Wcm-2 appears at 600oC in the cell with the AFL.
알칼라인 조건에서의 산소발생반응을 위한 N-doped NiO 촉매
이진구,전옥성,설용건 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.5
Oxygen-evolution reaction (OER) in alkaline media has been considered as a key process for various energy applications. Many types of catalysts have been developed to reduce high overpotential in OER, such as metal alloys, metal oxides, perovskite, or spinel. Nickel oxide (NiO) has high potential to increase OER activity according to volcano plots. The exact mechanisms for OER has not been discovered, but defects such as cation or anion vacancy typically act as an active site for diverse electrochemical reactions. In this study, nitrogen was doped into NiO by using ethylenediamine for formation of Ni vacancy, and the effects of N doping on OER activity and stability was studied. 알칼라인 조건에서의 산소발생 반응(oxygen-evolution reaction: OER)은 다양한 에너지 시스템에 중요한 반응으로여겨지고 있다. 큰 overpotential을 감소시키기 위해 다양한 촉매들이 개발되고 있으며, 그 중 NiO는 높은 활성도에 대한 가능성으로 인해 연구가 활발하게 진행되고 있다. 촉매의 표면에서 OER에 대한 메커니즘은 정확하게 규명되지는않았지만, 산화물 촉매에서 Ni 또는 O vacancy와 같은 결함들은 많은 전기화학반응에서 활성점으로 여겨진다. 따라서, 본연구에서는 nitrogen을 ethylenediamine을 이용하여 NiO의 O위치에 치환하여 Ni vacancy를 형성하고 그로 인해서 OER의activity와 내구성에 어떠한 영향을 미치는지에 대해 분석해 보았다.
Carbon Dioxide Reduction and Utilization Technology through Carbon Fixation in Aqueous Phase
강동우,이민구,조호용,전옥성,이예연,박진원 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.11
The concentration of carbon dioxide in atmosphere is gradually increasing as industrial activity is being facilitated. Since most of the industries are getting their energy from fossil fuels such as coal, petroleum and gas, carbon dioxide production is inevitable. However, by applying suitable carbon capture process at the end of the carbon dioxide emission facilities, the amount of carbon dioxide emitted to atmosphere can be significantly reduced. Thus, Carbon Capture and Storage (CCS) technologies have been developed by many nations. In that technology, captured carbon dioxide is stored in deep ocean or the underground holes. However, considering environmental effects and geological distinct characteristics, CCS technologies are thought to be developed finding new way to handle captured carbon dioxide. One of the method is to turn captured carbon dioxide into precipitated calcium carbonate salt by adding calcium ions. Conventionally, calcium carbonate salt formation is achieved by reaction under high pressure and temperature. However, this method requires large amount of energy to maintain reaction condition. Hence, carbon dioxide reduction and utilization technology through carbon fixation or carbonation in aqueous phase is proposed in this research. Using aqueous absorbent, carbon dioxide is captured and precipitated calcium carbonate salt was formed by adding calcium ions. All of the reaction occurred under ambient temperature and pressure (1 atm, 298.15 K). The amount of carbon dioxide reduction as well as yield of precipitated calcium carbonate salt were considered. Also, through instrumental analysis including Scanning Electron Microscope (SEM), X‐Ray Diffraction (XRD) and Thermogravimetric Analysis (TGA), possibility of final product utilization was investigated.
A Novel design of Composite Support for A Highly Active and Durable PEM Fuel Cell Catalyst
지윤성,조용일,전유권,황호정,전옥성,권오찬,김정필,설용건 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Polymer electrolyte membrane fuel cell (PEMFC) has been granted extensive attention as a one of attractive electrochemical energy conversion devices. Because, it withholds many benefits such as high energy efficiency, high power density and rapid start up, etc. However, the main problem is the cost of generation still higher than conventional power generators. To overcome this hurdle, researchers are trying to reduce the usage of platinum. In order to use a less Pt catalyst per unit electricity production, more active catalyst with stable support needs to be developed. In this study, a novel composite nanofiber support was prepared by growing carbon nanofibers on the electrospun titania nanofiber using methane as a source. Platinum nanoparticles were deposited on the nanofibrous support by polyol method. Finally, the synthesized catalyst was showed higher activity and improved stability. These properties are characterized by XRD, SEM, TEM, and electrochemical measurements.
권오찬,황호정,김정필,지윤성,전옥성,설용건 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Lithium ion battery is a technology on its way of closing on its theoretical bounds. In this sense, secondary zinc air batteries are a strong contender as a next generation power source. As great possibilities are hidden in this particular system as their beneficial properties include: larger energy density, lesser tariffs on the environment and cheaper materials. Although with such aspects, the cyclic stability has been a constant undermining factor. Preceding works have been on the understanding of the electrode properties, but not much insight has been given to the intermediate components; the electrolyte and the separator. Herein the presented work shows some light to the influential effects of the zincate ion. It has been observed that the crossover of the zincate ion is a significant factor effecting the life of a secondary zinc air battery. Furthermore a facile mitigation strategy has been providing using a anion exchange membrane.