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박막을 형성한 원통형 덩어리 모델의 다공성 기체확산 전극 유효성인자

Effectiveness Factor for Po- rous Gas Diffusion Electrode of Cylindrical Agglomerate Model with Thin Film

HWAHAK KONGHAK, October 1996, 34(5), 663-667(5), NONE
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Abstract

다공성 기체확산 전극을 전해질용액의 얇은 박막으로 덮혀있는 원통형덩어리 모델로 가정하고 유효성인자를 조사하였다. 반응속도상수, 확산계수, 전도도, 덩어리크기, 전극의 두께, 온도 등의 여러 시스템변수들이 네 개의 무차원파라미터로 나타내어졌다. 덩어리의 크기를 반경의 절반으로 정의했을 때 평판덩어리 모델일 때보다 유효성인자가 약간 크게 나타났지만 시스템변수들의 영향은 비슷하게 나타났다. 전해질 박막두께와 덩어리크기의 비가 0.01 이하가 되면 박막에 의한 영향이 대단히 작게 나타났다. 전극의 성능을 최적으로 하는 전극의 두께는 덩어리의 형태에 무관한 것으로 보여졌다.
The porous gas diffusion electrode was described by cylindrical agglomerate model with electrolyte thin film to investigate the effectiveness factor. System variables such as reaction rate constant, diffusion coefficients, conductivity, agglomerate size, electrode thickness and temperature were combined into four dimensionless parameters. The effectiveness factor was glightly larger than that for slab agglomerate model. However, the effects of the system variables on the effectiveness factor were similar. The effect of electrolyte thin film was very small where the ratio of the thin film thickness to the agglomerate size was less than 0.01. The electrode thickness for the optimum electrode performance was independent of the agglomerate shape.

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