• Proceedings of the KIEE Conference
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• 2000.11d
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• pp.857-859
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• 2000

A planar MEA(Multi-channel Electrode Array) has been developed for monitoring the electrical activity of electrogenic cells in a cell culture by an extracellular recording. The material, fabrication process, characterization of the array, cleaning effect and impedance according to opening size by impedance measurement are described.

• New & Renewable Energy
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• v.2 no.2 s.6
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• pp.50-59
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• 2006

An experimental and numerical study is carried out to investigate the performance and the efficiency humidifying Membrane Electrolyte Assembly and having the double-layered catalyst in a fuel cell system which is taken into account the physical and thermal concept. Based on the principals of the problem, the equation of electronic charge conservation equation, gas-phase continuity equation, and mass balance equation are used for the numerical calculation. A unit cell for $200cm^2$ MEA is assembled and measured for finding better operational situation. After finding the optimal condition, 10 cell stacked PEMFC is fabricated. For the performance evaluation, V-I and power curves are examined in detail by changing the condition of humidity, temperature, pressure, thickness of catalyst and oxidant. It is found that the power is maximized around 500W at 80A.

• Korea-Australia Rheology Journal
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• v.16 no.1
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• pp.35-45
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• 2004

Rates of chemical absorption of $CO_2$ in water-in-oil (w/o) emulsion were measured in a flat-stirred vessel at $25^{\circ}C$. The w/o emulsion was composed of aqueous monoethanolamine (MEA) droplets as a dispersed phase and non-Newtonian viscoelastic benzene solutions of polybutene (PB) and polyisobutylene (PIB) as a continuous phase. The liquid-side-mass transfer coefficient ($k_L$) was obtained from the dimensionless empirical equation containing Deborah number expressed as the properties of pseudoplasticity of the non-Newtonian liquid. $k_L$ was used to estimate the enhancement factor due to chemical reaction between $CO_2$ and MEA in the aqueous phase. PIB with elastic property of non-Newtonian liquid made the rate of chemical absorption of $CO_2$ accelerate compared with Newtonian liquid.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.325-328
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• 2006

고분자 전해질 연료전지의 전극을 gradient catalyst coating 방법을 이용하여 제조하였다. 촉매 잉크제조 시 나피온 이오노머의 함침 구성비를 다르게 하여 조성 비율이 다른 gradient 구조를 갖도록 하여 전극을 제조하였다. Anode Cathode의 두 전극을 각각 나피온 함량비가 다른 두 개의 gradient 층구조의 촉매층으로 9:1, 8:2, 7:3, 6:4 비율의 조성비로 성능을 측정하였으며, 전극의 전기화학적 반응 면적을 알아보기 위해 순위전위법을 그리고 분극 저항(Polarization resistance) 변화를 알아보기 위해서는 0.7V에서 임피던스 측정법의 전기화학분석법으로 전극 제조법에 따른 성능변화를 확인하였다. 특히 Gradient catalyst coating 방법을 이용하여 제조한 MEA는 종래 방식의 MEA보다 high current $density(1000mA/cm^2)$이상에서 향상된 성능을 보였다.

• Proceedings of the Materials Research Society of Korea Conference
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• 2002.05a
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• pp.139-139
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• 2002

• Proceedings of the Materials Research Society of Korea Conference
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• 2002.05a
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• pp.138-138
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• 2002

• 한국전기화학회:학술대회논문집
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• 2005.07a
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• pp.87-92
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• 2005

• 한국가스학회:학술대회논문집
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• 2005.05a
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• pp.229-229
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• 2005

• 한국전기화학회:학술대회논문집
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• 2004.06a
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• pp.215-218
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• 2004

• Korean Chemical Engineering Research
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• v.45 no.2
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• pp.197-202
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• 2007

This research was basically carried out to extend the application of $CO_2$ absorption processes for flue-gas system, which are mainly applied to a reforming process in petro-chemical industries. In general, MEA absorbent has some problems in flue-gas treatment, such as, degradation, regeneration energy and absorption capacities. As we known, sterical hindered amine, typically AMP (2-amino 2-methyl 1-propanol), have a good potential to improve these problems. In this paper, the characteristics of $CO_2$ absorption in aqueous AMP solution were measured and compared with that of MEA. It has been found that the $CO_2$ absorption capacity in AMP is double than that of MEA in the low $CO_2$ partial pressure system such as flue-gas. Also, the equilibriums of $CO_2$-AMP system were partially suggested, which are essentially needed to design the absorption process.