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Graphene has been obtained at atmospheric pressure and low temperature on exhausted activated carbon-derived SiC nanoparticles. The graphene’s growth, traced by online analyzers, has been obtained from an external source of carbon, in particular by methane/hydrogen chemical vapor deposition (CVD). Recycled SiC has been chosen as growth substrate to carry out a convenient process and to increase the added value of the recycled, combining the favorable properties of different substances. Therefore, the SiC powder and the composite material obtained have been carefully characterized by the combined use of different techniques and tested as supercapacitor electrodes. The results show a very high capacitances up to 114.7 F/g for SiC alone and three times higher in the presence of graphene with an excellent cycle stability.

The effect of composition, microstructure, and preferred orientation upon the oxidation of iron‐nickel‐cobalt alloy was investigated. Decarburized samples were oxidized at various temperatures and times. Decarburization at 1100°C in wet hydrogen enhances the (200) orientation. The oxidation rate depends on the alloy grain size and minor alloy constituents and is enhanced at the grain boundaries. The oxide is predominantly spinel with increased amounts of α‐Fe2O3 appearing in fine‐grain alloy oxidized at lower temperatures and longer times.

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