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전해질 두께가 직접 메탄올 연료전지의 성능에 미치는 영향
서상헌(Sang Hern Seo),이창식(Chang Sik Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this work is to investigate the effect of membrane thickness on the performance of direct methanol fuel cell(DMFC) at various operating conditions. The membranes of Nafion 115(127㎛) and Nation 212(50.8㎛) were examined with changes of operating temperature, concentration of methanol solution, flow rate and cathode backpressure. The experiments were performed by using 5㎠ single cell with serpentine flow field for both anode and cathode. The catalyst loading on the anode was 4㎎/㎠ with Platinum-Ruthenium and the catalyst loading on the cathode was 4㎎/㎠ Platinum-Black. The performance was expressed by voltage-current density curve. It was found that the performance of DMFC was improved by decreasing of resistance with increase of membrane thickness. whereas the open circuit voltage(OCV) was increased by reducing of methanol crossover. Therefore. thc optimal membrane thickness can be an important factor to operate maximum performance in DMFC.
디메틸에테르와 에탄올을 이용한 고분자 전해질 연료전지의 성능 특성
서상헌(Sang Hern Seo),이창식(Chang Sik Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This study conducted an experiment on the performance characteristics of polymer electrolyte membrane fuel cell using dimethyl ether and ethanol and investigated on the ohmic loss, activation loss and crossover loss. A blend of dimethyl ether(DME) and ethanol pressurized to 5 bar was supplied to serpentine flow field of anode. Membrane electrode assembly (MEA) consists of Nafion 115, anode catalyst loading Pt-Ru(4㎎/㎠) and cathode catalyst loading Pt-black(4㎎/㎠). Also, the impedance test was carried out to analysis performance losses such as ohmic loss and activation loss precisely. Fuel crossover from anode to cathode through the membrane was measured by using nitrogen gas at the cathode and power supply. It was found from the result that the performance of using a blend of DME and ethanol was more increased than that of using ethanol because the activation loss was decreased. Moreover, the open circuit voltage (OCV) and over
메탄올 및 에탄올을 이용한 직접 알코올 연료전지의 성능 특성
서상헌(Sang Hern Seo),이창식(Chang Sik Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper describes the performance characteristics of direct alcohol fuel cell utilized methanol and ethanol experimentally. In this experiment, Pt-Ru(4㎎/㎠) and Pt-black(4㎎/㎠) were used as the anode and cathode catalysts, respectively, and the N-115 was used as the membrane. The ohmic loss and activation loss were measured by the AC impedance spectrometer. Also, to investigate the methanol and ethanol permeation from then anode to the cathode through the membrane, the crossover current density was measured by power supply. It was revealed that the performance of direct methanol fuel cell(DMFC) was much higher than that of direct ethanol fuel cell(DEFC) because the ohmic loss and activation loss of DMFC were smaller than those of DEFC. However, methanol shows the higher crossover current than ethanol.
고분자 전해질 연료전지의 작동조건이 성능에 미치는 영향
류재림(Jae Lim Ryu),서상헌(Sang Hern Seo),이창식(Chang Sik Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The objective of this paper is to investigate the effect of operating condition on the performance of hydrogen-oxygen polymer electrolyte membrane fuel cell. The catalysts consist of Pt-carbon with loading 0.5㎎/㎠ at both electrodes symmetrically. This experiment was conducted to find the optimal operating conditions such as cell temperature, hydrogen flow rate, anode backpressure, oxygen flow rate and cathode backpressure. The performance was analyzed by electronic-load with constant voltage mode and expressed by voltage-current density. Additionally, AC impedance was measured to investigate of ohmic and activation loss. The results were indicated that the cell performance increased with increase of cell temperature, oxygen flow rate, and cathode backpressure. The activation loss decreased as the hydrogen flow rate and high anode backpressure increased. And the ohmic loss increased as the anode backpressure and oxygen flow rate increase.