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Effect of operating temperature using Ni-Al-ZrH<sub>2</sub> anode in molten carbonate fuel cell
서동호(Seo, Dongho),장성철(Jang, Seongcheol),윤성필(Yoon, Sungpil),남석우(Nam, Suk Woo),오인환(Oh, In-Hwan),임태훈(Lim, Tae-Hoon),홍성안(Hong, Seong-Ahn),한종희(Han, Jonghee) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Fuel cell is a device that directly converts chemical energy in the form of a fuel into electrical energy by way of an electrochemical reaction. In the anode for a high temperature fuel cell, nickel or nickel alloy has been used in consideration of the cost, oxidation catalystic ability of hydrogen which is used as fuel, electron conductivity, and high temperature stability in reducing atmosphere. Most MCFC stacks currently operate at an average temperature of 650?C. There is some gains with decreased temperature in MCFC to diminish the electrolyte loss from evaporation and the material corrosion, which could improve the MCFC life. However, operating temperature has a strong related on a number of electrode reaction rates and ohmic losses. Baker et al. reported the effect of temperature (575 to 650?C). The rates of cell voltage loss were 1.4mV/?C for a reduction in temperature from 650 to 600?C, and 2.16mV/?C for a decrease from 600 to 575?C. The two major contributors responsible for the change in cell voltage with reducing operation temperature are the ohmic polarization and electrode polarization. It appears that in the temperature range of 550 to 650?C, about 1/3 of the total change in cell voltage with decreasing temperature is due to an increase in ohmic polarization, and the electrode polarization at the anode and cathode. In addition, the oxidation reaction of hydrogen on an ordinary nickel alloy anode in MCFC is generally considered to take place in the three phase zone, but anyway the area contributing to this reaction is limited. Therefore, in order to maintain a high performance of the fuel cell, it is necessary to keep this reaction responsible area as wide as possible, that is, it is needed to keep the porosity and specific surface area of the anode at a high level. In this study effective anodes are prepared for low temperature MCFC capable of enhancing the cell performance by using zirconium hydride at least in part of anode material.
유해화학물질 누출사고시 피해 최소화를 위한 초기대응 연구
서동호(Dongho Seo),이봉우(Bong-woo Lee) 한국위험물학회 2018 한국위험물학회지 Vol.5 No.2
Firefighting is an organization that can respond to complex accidents such as chemical accidents, rapid on-site access in the event of a disaster, and life-saving. Especially, when responding to hazardous substances spill accidents, the firefighting team conducts disaster prevention activities in a way that safety of members and secondary harmful substances do not occur. In this study, we have arranged the on-site response sequence to minimize the damage in case of leakage of toxic chemicals by reviewing the previous research of acidic chemical such as hydrofluoric acid and carrying out experimental of basic chemicals such as ammonia water through neutralization, adsorption and dilution tests. This paper proposes a method of using portable scrubber which can effectively decontaminate toxic gas also.