کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1284693 973084 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Percolation theory in SOFC composite electrodes: Effects of porosity and particle size distribution on effective properties
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Percolation theory in SOFC composite electrodes: Effects of porosity and particle size distribution on effective properties
چکیده انگلیسی

A percolation model, accounting for polydispersion of powders and presence of pore formers (i.e. porosity), is presented to predict effective properties of composite electrodes for solid oxide fuel cells, such as the three-phase boundary length and the mean hydraulic radius. Porosity affects both numbers of contacts (so probabilities of connection) and number of particles per unit volume. Both these effects, together with granulometric distribution, are accounted for the estimation of effective properties. As a consequence, the theory can predict numbers of contacts, coordination numbers and therefore effective properties of the electrode for multicomponent polydisperse mixtures.Model simulations show that the three-phase boundary length sharply decreases as porosity increases while the effects of polydispersion of powders are less pronounced, although significant, suggesting that these features should be considered in SOFC electrode models.


► New percolation model to predict effective properties in SOFC composite electrodes.
► Accounting for polydispersion of powders and presence of pore formers.
► Pore formers affect both numbers of contacts and number of particles per unit volume.
► Porosity has a strong influence on effective properties reducing TPB-length
► Polydisperse powders reduce TPB-length.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 196, Issue 22, 15 November 2011, Pages 9429–9436
نویسندگان
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