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3.4.8. Surface area vs. porosity – a dominant factor? 3.4.8.a) The effect of the surface area It has been demonstrated in the literature that, when increasing the surface area of typical GDL carbon collector by growing CNTs on them, higher discharge capacities were obtained104. In our study, we also aimed at investigating different NwC-type materials (commercially available products, purchased from Freudenberg) as porous current collectors, with different surface areas and/or modification of one NwC side. Physical properties of three different NwC felts used (Table 3-5), as well as their SEM photos (Figure 3-20), are presented below. Chapter 3: S8 electrode on NwC NwC type (name) Characteristics Weight (mg cm-2) Thickness (μm) BET (m2 g-1) H2315 H2315-I2C8 H2315-C2 2 sides: microporous layer 13.6 250 4.55 H2315-T10A Similar to ‘classic’; hydrophobic treatment 10.6 209 not measured ‘classic’ 2 sides: hydrophobic treatment / microporous layer 9.7 13.2 209 238 0.05 10.04 Table 3-5. Physical properties of different types of NwC sheets (GDL felt) – a commercial products of Freudenberg216. Some of them presenting surface treatment or additional layer of microporous carbon particles. Figure 3-20. SEM photos of three different NwC felts: T10 type (in red), I2C8 (in green) and C2 type (in yellow). All purchased from Freudenberg216. 96PDF Image | Accumulateur Lithium Soufre
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Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
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