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향류확산법으로 제조한 Pt-SPE 복합체에서의 백금의 농도분포
The Pt Concentration Profiles in Pt-SPE Composite Made by Counter-current Diffusion
플로리다 대학교 화학과 1연세대학교 공과대학 화학공학과
Department of Chemistry, University of Florida, USA 1Department of Chemical Engingeering, College of Engineering, Yonsei University, Korea
HWAHAK KONGHAK, February 2000, 38(1), 47-52(6), NONE
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Abstract
항류확산법에 의해 염화백금산 수용액과 환원제인 붕소산나트륨을 사용하여 제조한 Pt-SPE의 막(membrane)내에서의 백금의 농도 분포를 설명하기 위한 수학적 모델식으로부터 구한 값과 실험에 의해 제조한 Pt-SPE의 막내 농도 분포를 비교하였다. 모델식의 해석에 필요한 확산계수는 투과실험을 통하여 측정하였다. 이로부터 전극물질의 담지위치를 예측할 수 있으며, Pt-SPE 복합체는 전극물질과 환원제의 상대적 확산계수가 작은 전극물질쪽에서 형성되는 것으로 나타났다.
The theoretical data, from the model equations for the description of the metallic platinum concentration profiles across the membrane, have been compared with experimental results obtained by electron dispersive microanalysis spectroscope. The diffusivity data for the model analysis are obtained from permeation test using diffusion cell consisted by two compartments. From the results, we could be predict the location of deposition of electrode material. The Pt-SPE composites were deposited at the location where relative diffusivity between electrode material and reductant is lower.
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Kita H, Fukikawa K, Nakajima H, Electrochim. Acta, 29, 12 (1984)
Schelly ZA, Szamosi J, Liesegang GW, J. Phys. Chem., 89, 9 (1985)
