期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 164, 期 6, 页码 F600-F609出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0961706jes
关键词
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资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada [371088-10]
- Helmholtz-Alberta Initiative
- Canadian School of Energy and Environment
- APC/NSERC Catalyst Research for Polymer Electrolyte Fuel Cell Network [14323]
- Canadian Foundation for Innovation
- Fuel Cell Technologies Office, Office of Energy Efficiency and Renewable Energy of the U.S. Department of Energy [DE-AC02-05CH11231]
The aggregate size in fuel cell catalyst inks depends on the type of dispersion medium, particle concentration, and addition of stabilizing agents. In this work, ink stability and particle size of carbon black and carbon black/Nafion dispersions in four non aqueous media, viz., methanol, ethanol, isopropanol and ethyl acetate are studied. Based on visual inspection, isopropanol is found to be the best medium for dispersion of carbon black inks. To rationalize this observation, a semi-empirical model based on diffusion limited aggregation was developed to evaluate the rate of particle aggregation and predict the ink stability time for each dispersion medium. The proposed model supports the experimental observation by qualitatively predicting the same relationship between carbon stability and the dispersion media. The model also showed that the dielectric constant of the dispersion medium and the particle zeta potential are primarily responsible for the ink stability. Particle size for the different inks was determined by dynamic light scattering with and without dilution. Experimental results show that Nafion is a strong stabilizing agent, increasing the ink stability and decreasing the particle size of carbon aggregates. The beneficial effects of Nafion are independent of its concentration and are observed even at Nafion volume fractions of 10 wt%. The interaction energy is found to be a strong function of the surface potential for the dispersion medium with a higher dielectric constant. (C) The Author(s) 2017. Published by ECS.
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