Both electrodes are based on graphitic carbon. This capacity retention is on par with that of graphitic anodes today. Electrolytic aluminium smelting also uses graphitic carbon electrodes. Alumina favored the deposition of the graphitic carbon nitrides layers on the exposed surface. All have the same, AlB, structure containing a graphitic layer of boron atoms. A commercial graphitic carbon nitride is available under the brand name Nicanite. Small graphitic crystals in meteoritic iron are called cliftonite. Graphitic carbon nitride is reported as one of the best hydrogen storage materials. Graphitic carbon nitride can be made by polymerization of cyanamide, dicyandiamide or melamine. Carbon fluorides (e.g., (CF) and (CF)) are prepared by reaction of fluorine with graphitic carbon. In 2015 a coiled form of graphene was discovered in graphitic carbon (coal). Researchers occasionally observed thin graphitic flakes ("few-layer graphene") and possibly even individual layers.