[논문]고분자 전해질 연료전지에서 탄소복합 기체확산층의 제조와 특성분석

심중표; 한춘수; 선호정; 박경세; 이지정; 이홍기

doi:10.7316/khnes.2012.23.1.034

고분자 전해질 연료전지에서 탄소복합 기체확산층의 제조와 특성분석
Preparation and Characterization for Carbon Composite Gas Diffusion Layer on Polymer Electrolyte Membrane Fuel Cells 원문보기

한국수소 및 신에너지학회 논문집 = Transactions of the Korean Hydrogen and New Energy Society, v.23 no.1, 2012년, pp.34 - 42

심중표 (군산대학교 나노화학공학과) , 한춘수 (군산대학교 나노화학공학과) , 선호정 (군산대학교 신소재공학과) , 박경세 (군산대학교 화학과) , 이지정 (우석대학교 수소연료전지 및 응용부품기술 지역혁신센터) , 이홍기 (우석대학교 수소연료전지 및 응용부품기술 지역혁신센터)

Abstract ▼ AI-Helper

Gas diffusion layers (GDLs) of carbon composite type in polymer electrolyte fuel cells were prepared by simple and cheap manufacturing process. To obtain the carbon composite GDLs, carbon black with polymer binder was mixed in solvent, rolled to make sheet, and finally heat-treated at $340^{\circ}C$. The performance of fuel cell using composite GDLs was changed by PTFE content. The physical properties of composite GDLs for pore, conductivity and air permeability were analyzed to compare with the variation of fuel cell performance. The conductivity of composite GDLs was very similar to carbon paper as commercial GDL but pore properties and air flux were considerably different. The porosity, PTFE content and conductivity for composite GDLs did not have an influence on the cell performance much. The increase of pore diameter and air flux led to enhance cell performance.

주제어

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제안 방법

Macro-pores do not exist in the carbon composite GDLs, unlike the situation for carbon paper, and this may decrease mass transport though the GDL. The physical properties of the carbon composite GDLs were analyzed to determine their effects on fuel cell performance. The porosities, PTFE contents and conductivities for the carbon composite GDLs did not have much influence on the cell performance.

대상 데이터

In this study, the carbon composite GDLs were prepared by mixing carbon black with a polymer binder, namely PTFE. The main properties of GDLs that affect fuel cell performance are hydrophobicity, electrical conductivity, pore size distribution, and air permeability.

이론/모형

Air flux through a plane (along the z direction) of the GDLs was measured with a laboratory-made instrument using the Gurley method (ASTM D737). This instrument, a permeometer, measured air flow per minute at 1.
The permeability coefficients of the GDLs were calculated using Darcy’s law; the results are shown in Table 1.

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