• 한국수소및신에너지학회논문집
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• 제25권4호
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• pp.419-424
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• 2014

Direct ethanol fuel cell has been fabricated with ceramic membrane. A porous silicon carbide (SiC) membrane having approximately 30% porosity has been applied for a direct ethanol proton exchange membrane (DE-PEM) fuel cell. A horizontal type cell having Pt ($18mg/cm^2$) catalyst layer on both side of the ceramic membrane was used for the demonstration test. The ethanol oxidation based-fuel cell stack showed very high voltage (1.289V) and measurable current level (68mA) even though at room temperature.

• 멤브레인
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• 제26권5호
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• pp.329-336
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• 2016

수소이온 교환막(PEM; Proton Exchange Membrane)은 연료전지 막-전극 복합체(MEA; Membrane-electrode Assembly)를 구성하는 핵심 소재 중 하나로서, 촉매와 함께 연료전지 성능을 결정하는 중요한 역할을 한다. 이러한 수소이온교환막의 성능은 내부에 존재하는 수소이온 전달 통로인 수화 채널의 구조에 큰 영향을 받는 것으로 알려져 있다. 분자 동역학(MD; Molecular Dynamics) 전산모사 기술은 이러한 소재 내부의 분자 및 원자구조를 파악하기 위한 유용한 도구로서, 수소이온 교환막의 구조 및 특성에 관한 많은 관련 연구가 진행되고 있다. 본 총설에서는 분자동역학 전산모사 관련 연구에 대한 동향을 정리하고, 이를 통해 어떤 구조적 특징들을 분석할 수 있는지 제시하여, 수소이온 교환막 연구자들과 분리막 연구자들에게 분자동역학 전산모사 기술의 유용성에 대하여 소개하고자 한다.

• 한국가스학회지
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• 제11권1호
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• pp.51-54
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• 2007

78개 셀의 전극유효 면적이 $295cm^{2}$인 고분자 전해질 연료전지(PEMFC) 스택의 운전특성과 CO 피독에 대한 영향을 조사하였다. 전류밀도 $325mA/cm^{2}$에서 출력 5.4kW를 6시간 유지시키는 동안 셀들의 전압편차는 2.3%로 매우 안정함을 보였다. 개질과정의 부산물로 생성되는 CO는 PEHFC의 성능에 중요한 영향을 끼치는 스택의 주 오염물질중의 하나이다. 시간에 따른 연속적인 CO 피독 실험(5-20ppm)은 스택의 피독과 재생과정의 route를 알 수 있었다.

• 한국수소및신에너지학회논문집
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• 제23권3호
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• pp.250-255
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• 2012

In this paper, the development and performance analysis of a fuel cell-powered unmanned aerial vehicle is described. A fuel cell system featuring 1 kW proton exchange membrane fuel cell combined with a highly pressurized fuel supply system is proposed. For the higher fuel consumption efficiency and simplification of overall system, dead-end type operation is chosen and each individual system such as purge system, fuel supply system, cooling system is developed. Considering that fluctuation of exterior load makes it hard to stabilize fuel cell performance, the power management system is designed using a fuel cell and lithium-ion battery hybrid system. After integration of individual system, the performance of unmanned aerial vehicle is analyzed using data from flight and laboratory test. In the result, overall system was properly operated but for more duration of flight, research on weight lighting and improvement of fuel efficiency is needed to be progressed.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.201-202
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• 2008

• 한국수소및신에너지학회논문집
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• 제19권4호
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• pp.313-321
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• 2008

Dynamics of the proton exchange membrane fuel cell is specially important when the system is frequently working on transient conditions. Even though the dynamics of proton exchange membrane fuel cell for residential power generation is less critical than that of PEMFC for transportation application, the system dynamics of PEMFC for RPG can be very important for daily start-up and stop. In particular, thermal management of the PEMFC for RPG is very important because the heat generation from electrochemical reaction is delivered to the home for hot water usages. Additionally, the thermal management is also very important for heat balance of the system and temperature control of the fuel cell. The objective of this study is to develop a dynamic system model for the study of PEMFC performance over various BOP options. Basic simulation results will be presented.

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 2002년도 추계총회 및 학술발표회
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• pp.8-8
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• 2002

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.643-645
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• 2008

Stainless steel 304 and 316 plates were deposited with the multi-layered coatings of titanium film (0.1um) and gold film (1-2um) by an electron beam evaporation method. The XRD patterns of the stainless steel plates modified with the multi-layered coatings showed the crystalline phases of the external gold film and the stainless steel substrate. Surface microstructural morphologies of the stainless steel bipolar plates modified with multi-layered coatings were observed by AFM and FE-SEM images. The external gold films formed on the stainless steel plates showed microstructure of grains of about 100nm diameter. The grain size of the external surface of the stainless steel plates increased with the gold film thickness. The electrical resistance and water contact angle of the stainless steel bipolar plates covered with multi-layered coatings were examined with the thickness of the external gold film.

• Korean Membrane Journal
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• 제5권1호
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• pp.18-24
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• 2003

In order to improve the mechanical properties of the sulfonated polysulfone (SPSf) membranes previously synthesized in our laboratory, poly(vinyl alcohol) (PVA) was blended which is well known as the excellent physical and chemical properties. The resulting membranes blended with several molecular weight of PVA varying from 13,000 to 124,000 have been characterized to investigate the effect of PVA molecular weight in terms of ion conductivities, methanol permeabilities, water contents and ion exchange capacities for both heat treated and untreated membranes at 150$^{\circ}C$. The proton conductivity is decreased as the molecular weight of PVA increases. The plain SPSf-6.0 showed the proton conductivity of 0.078 S/cm whereas the blended membrane with M.W. 31,000 PVA indicated 0.04 S/cm. For methanol permeabilities, when PVA is added to SPAf-6.0, methanol crossover is increased because of the gain of the hydrophilicity from 3.4 to 6.5${\times}$10$\^$-6/ $\textrm{cm}^2$/s. For the annealed blended membranes (with M.W. 31,000 PVA), both the methanol corssover and proton conductivity showed very consistent values, about 2.3${\times}$10$\^$-6/ $\textrm{cm}^2$/s and 0.036 S/cm, respectively.

• 공업화학
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• 제34권2호
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• pp.99-105
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• 2023

Recently, 2D materials greatly impact in the various applications especially in the energy conversion and storage devices. Among the 2D materials, nowadays researchers are showing their propensity towards the MXenes due to their potential structural and physical properties as well as their use in various applications. Recently, MXenes have been used as filler in polymer electrolytes membranes and as catalytic support to increase the performance of fuel cells (FCs). But this review covers only recent progress and application of MXenes in proton and anion exchange membranes for FCs. Also, this review will provide a significant guidance and broad overview for future research in MXenes based polymer electrolyte membrane for FCs.