• Proceedings of the KSME Conference
• /
• 2007.05a
• /
• pp.1433-1438
• /
• 2007

Characteristics of a phase change type micro actuator have been studied. The micro actuator has been designed for a micro-pump in an active direct methanol fuel cell(DMFC), consisting of an actuating chamber, a membrane, an electric heater, and a sensor of resistance temperature detector (RTD). In the present study, researches have been focused on the response of the actuator to control algorithm of the heater. The experiments demonstrated that the displacement of the membrane increase with temperature variation which is a function of applied voltage, duty ratio, and operating frequency of heating. The results also showed that operation of the actuator with high voltage at small duty of heating is more efficient than the same power consumption of heating with low voltage at large duty.

• Proceedings of the Membrane Society of Korea Conference
• /
• 2004.03a
• /
• pp.123-134
• /
• 2004

연로로부터 화학에너지를 직접 전기에너지로 바꾸는 연료전지(Fuel Cells)중 고체형 고분자 전해질 연료전지(Polymer Electrolyte Membrane Fuel Cell: PEMFC)와 직접 메탄올 연료전지(Direct Methanol Fuel Cell: DMFC)는 효율이 높고, zero emission 가능성으로 차세대 수송용 전원으로 각광받고 있는 미래 환경친화적 에너지원이다. 수소와 산소(또는 공기)와의 반응을 이용한 것이 PEMFC이고, 수소를 연료로 쓰지 않고 액체상 메탄올을 직접 연료로 사용하는 것이 DMFC이다. (중략)

• Clean Technology
• /
• v.10 no.2
• /
• pp.53-59
• /
• 2004

Direct methanol fuel cells (DMFC) are presently paid attention due to their higher energy density and portability. In order to slove problems such as high anodic overpotential and methanol crossover in DMFC, an analytical analysis for electrochemical model using Tafel equation and limiting current density was performed. Change of operational parameters such as temperature, transfer coefficients and membrane thickness results in helpful informations on voltage-current curves.

• Proceedings of the Polymer Society of Korea Conference
• /
• 2006.10a
• /
• pp.127-128
• /
• 2006

Nafion/basic polymer composite membranes were prepared to reduce the methanol crossover for the application of direct methanol fuel cell. The thermal and mechanical properties increased with increasing basic polymer contents due to the formation of complex via acid/basic interaction. The water uptake, proton conductivity, methanol permeability decreased with increasing basic polymer concentration by reduction of acidity associated with the formation of acid/base complex. The molecular effect on those properties was not considerable.

• 한국전기화학회:학술대회논문집
• /
• 2005.07a
• /
• pp.219-222
• /
• 2005

• 한국전기화학회:학술대회논문집
• /
• 2005.07a
• /
• pp.241-244
• /
• 2005

• 한국전기화학회:학술대회논문집
• /
• 2002.07a
• /
• pp.227-232
• /
• 2002

• 한국전기화학회:학술대회논문집
• /
• 2002.07a
• /
• pp.287-292
• /
• 2002

• 한국전기화학회:학술대회논문집
• /
• 2002.07a
• /
• pp.43-48
• /
• 2002

• 한국전기화학회:학술대회논문집
• /
• 2002.07a
• /
• pp.65-70
• /
• 2002