[논문]Reduction of Methanol Crossover in a Direct Methanol Fuel Cell by Using the Pt-Coated Electrolyte Membrane

Jung, Eun-Mi; Rhee, Young-Woo; Peck, Dong-Hyun; Lee, Byoung-Rok; Kim, Sang-Kyung; Jung, Doo-Hwan

doi:10.5229/jkes.2008.11.1.001

Reduction of Methanol Crossover in a Direct Methanol Fuel Cell by Using the Pt-Coated Electrolyte Membrane 원문보기

전기화학회지 = Journal of the Korean Electrochemical Society, v.11 no.1, 2008년, pp.1 - 5

Jung, Eun-Mi (Advanced Fuel Cell Research Center, Korea Institute of Energy Research) , Rhee, Young-Woo (Department of Chemical Engineering, Chungnam National University) , Peck, Dong-Hyun (Advanced Fuel Cell Research Center, Korea Institute of Energy Research) , Lee, Byoung-Rok (Advanced Fuel Cell Research Center, Korea Institute of Energy Research) , Kim, Sang-Kyung (Advanced Fuel Cell Research Center, Korea Institute of Energy Research) , Jung, Doo-Hwan (Advanced Fuel Cell Research Center, Korea Institute of Energy Research)

Abstract ▼ AI-Helper

A Pt-layer was deposited on the anode side of a Nafion membrane via a sputtering method in order to reduce methanol crossover in a direct methanol fuel cell (DMFC). The methanol permeation and the proton conductivity through the modified membranes were investigated. The performances of the direct methanol fuel cell were also tested using single cells with a Nafion membrane and the modified membranes. The Pt-layers on the membrane blocked both methanol crossover and proton transport through the membranes. Methanol permeability and proton conductivity decreased with an increase of the platinum layer thickness. At methanol concentration of 2 M, the DMFC employing the modified membrane with a platinum layer of 66 nm-thickness showed similar performance to that of a DMFC with a bare Nafion membrane in spite of the lower proton conductivity of the former. The maximum power density of the cell using the modified membrane with a platinum layer of 66 nm-thickness increased slightly while that of the cell with the bare membrane decreased abruptly when a methanol solution of 6M was supplied.

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제안 방법

In this study, a Nafion membrane was modified by depositing Pt film on the surface of the anode side using a sputtering method with the goals of decreasing methanol crossover and thus attaining better DMFC performance. The morphology, methanol permeation, and proton conductivity of the modified membranes were investigated and the performance of direct methanol fuel cells with the modified membranes was tested.
In this study, a Nafion membrane was modified by depositing a Pt thin film via the sputtering method on the surface of the membrane on the eiode side to reduce methanol crossover. The Pt layers were deposited uniformly and the thickness increased from 20 to 66 nm with increased sputtering time.
The conductivity was measured using an AC impedance spectroscope, which was equipped with a frequency-response analyzer (Solartron SI 1260, Impedance/Gain- phase analyzer) and a potentiostat (Solartron SI 1287, Electro-chemical interface). The range of frequency sweep was 5~70 kHz and the AC amplitude was 5 mV
All of the experimental data were collected after the fuel cell was run continuously for 12 hrs, during which time methan이 solution was fed to the anode and air was fed to the cathode. We evaluated the performance of the direct methanol fuel cell by plotting the voltage and the power density versus the current density as a function of the operating temperature and the methanol concentration.

대상 데이터

The cell consisted of a MEA sandwiched between two rectangular graphite plates with incorporated flow channels. The anode feed was methanol solution and the cathode feed was pure oxygen gas of ambient pressure.

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상세보기
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상세보기
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상세보기
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상세보기
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DOI : 10.5229/JKES.2008.11.1.001 [무료]
한국전기화학회 : 저널
Korea Open Access Journals : 저널
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