Metal‐Carbon Composite Materials from Fiber Precursors: I . Preparation of Stainless Steel—Carbon Composite Electrodes
| Autor: | Aravamuthan Krishnagopalan, Kohler David A, Bruce J. Tatarchuk, Zabasajja John N |
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| Rok vydání: | 1990 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Scanning electron microscope Composite number Sintering Carbon black Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Specific surface area Electrode Materials Chemistry Electrochemistry Fiber Composite material FOIL method |
| Zdroj: | Journal of The Electrochemical Society. 137:136-141 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.2086348 |
| Popis: | A novel approach to fabrication of composite metal‐carbon electrodes has been developed. Stainless steel fibers (2 μm diam) and carbon fiber bundles (20 μm diam) were combined with cellulose (as the binding agent) into an interwoven paper preform. The composite paper preform was then sintered to a stainless foil substrate to form the electrode structure. "Optimal sintering," experimentally determined by the percentage of initial carbon remaining in the sintered electrode, was achieved at 1423 K in for 2.5 min. Gas flow of was maintained at 10 cm3/min (STP) or a linear velocity of 2.6 cm/min with a total pressure of 101 kPa. These conditions were consistent with the thermodynamics and kinetics of sintering and catalyzed carbon gasification. The composite electrode structure was shown to possess the high surface area characteristic of carbon black and the structural integrity of sintered metals. The degree of intermixing of fibers in the composite paper preforms and in the sintered electrodes was clearly shown by scanning electron microscopy (SEM). Volumetric BET measurements showed a surface area of ca. 760 m2/g of carbon for the sintered composite electrode structure compared to ca. 790 m2/g for the precursor carbon fiber. It is believed these preparation techniques offer flexibility in the properties of the composite electrode (i.e., specific surface area, void volume, thermal and electrical conductivity, etc.). |
| Databáze: | OpenAIRE |
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