MEMS-based portable direct methanol fuel cells with platinum sputtered microcolumn electrodes using limited fuel sources백금 촉매가 증착된 미소돌기 전극을 이용한 유한연료형 휴대용 마이크로 직접메탄올연료전지에 관한 연구

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The paper presents a MEMS-based portable Direct Methanol Fuel Cell (DMFC), featured by a platinum sputtered microcolumn electrode and a built-in fuel chamber containing a limited amount of methanol fuel. Microcolumns are formed on the front-side of the electrode to increase the power density of the micro-DMFC, while the window frames on the back-side of the electrode increase the electrode stiffness to enhance the contact between electrodes and polymer electrolyte. We design and fabricate five different types of electrodes including the single window microcolumn electrode with the projection area of 5mm × 5mm (ME1), the single window planar electrode with the projection area of 5mm × 5mm (PE1), the 4-window microcolumn electrode with the projection area of 10mm × 10mm (ME4), the 16-window microcolumn electrode with the projection area of 10mm × 10mm (ME16) and the 16-window planar electrode with the projection area of $10mm × 10mm$ (PE16). In order to verify the microcolumn effect on the front-side of the electrodes and the window frame effect on the back-side of the electrodes, we measure and compare the average value and standard deviation of the maximum power density in single micro-DMFCs having 5 different electrodes. For single micro-DMFCs with ME1 and PE1 electrodes at room temperature with limited fuel source, the average values of the maximum power density are 43.26±30.16μW/㎠ and 3.24±1.66μW/㎠, respectively. Single micro-DMFCs with ME16, ME4 and PE16 electrodes at room temperature with the fuel flow of $5μl/min$ show the maximum power density of 31.04±0.29μW/㎠, 25.23±2.7μW/㎠ and 9.75±0.29μW/㎠, respectively. The microcolumn electrodes show at least 258% of the power density obtained by the conventional planar electrodes. Comparing the standard deviation in the power density of single micro-DMFC with ME16 electrodes to that of single micro-DMFCs with ME1 and ME4 electrodes to verify the window frame effect, we find that the window frames in the b...
Advisors
Cho, Young-Horesearcher조영호researcher
Description
한국과학기술원 : 기계공학전공,
Publisher
한국과학기술원
Issue Date
2003
Identifier
231053/325007  / 020005149
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학전공, 2003.8, [ xv, 131 p. ]

Keywords

Microcolumn Electrode; Micro Fuel Cell; Limited Fuel Sources; 유한연료형; 미소돌기전극; 마이크로 연료전지

URI
http://hdl.handle.net/10203/43210
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=231053&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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