NOVELTY - The electrode (100) comprises a fullerene covalently bonded to a conductive n-doped silicon carbide, less than or equal to 50% non-crystalline carbon and less than or equal to 5% of a transition metal that interferes with the ability of an active electrode structure to transfer electrons or detect an analyte, and an electrical lead (106) electrically conductively coupled to the conductive carbide. The fullerene is an aligned or non-aligned, entangled array, is formed by a carbo-thermal carbide conversion that is free of metal catalyst, consist of carbon nanotubes, and/or carbon nanorods, and display high edge plane character.    USE - The electrode is useful: in a sensor for detecting or quantifying an analyte in a test solution (all claimed); in batteries, electrochemical capacitors and fuel cells; for environmental and medical applications; and for voltammetric and/or electrochemical applications, where the analyte is chemical or biological analyte.    ADVANTAGE - The electrode can be easily manufactured with good electrode properties, high electron transfer rate and specific capacitance, increased electrical resistance and improved performance.    DETAILED DESCRIPTION - The electrode (100) comprises a fullerene covalently bonded to a conductive n-doped silicon carbide, less than or equal to 50% non-crystalline carbon and less than or equal to 5% of a transition metal that interferes with the ability of an active electrode structure to transfer electrons or detect an analyte, and an electrical lead (106) electrically conductively coupled to the conductive carbide. The fullerene is an aligned or non-aligned, entangled array, is formed by a carbo-thermal carbide conversion that is free of metal catalyst, consist of carbon nanotubes, and/or carbon nanorods, display high edge plane character, include a 2-dimensional array of fullerenes, is modified to include a transition noble metal that enhances the ability of the active electrode structure to transfer electrons or detect an analyte, and is provided that the transition metal does not function as a metal catalyst for fullerene growth. The electrode is characterized in that the peak separation of a cyclic voltammogram for the conductive carbide having a surface layer of the fullerene is less than 150-59.1 mV at a scan rate of 5mV/s in a 4mM ferricyanide and 1M potassium chloride solution, further includes less than or equal to 0.1% of a non-crystalline carbon and less than or equal to 0.1% of a metal catalyst, and is characterized by a G band Raman signature to Gasterisk band Raman signature of 10:1-1:5 at 514 run excitation and of 12:1-1:5 at 758 nm excitation. The transition metal and non-crystalline carbon are less than or equal to 1% of the active electrode structure. The conductive carbide has an ohmic resistance of less than 0.1 Omega /sq, and a 99% of crystalline carbide content, and is converted to fullerenes such that the fullerenes are a free standing mass of fullerenes. The active electrode structure further comprises a binder and/or a filler. The metal catalyst is present in an amount of less than 100 ppm. INDEPENDENT CLAIMS are included for:    (1) an active electrode structure;    (2) a sensor;    (3) a process for detecting or quantifying an analyte in a test solution; and    (4) a bulk fullerene material.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic side perspective view of an electrode.    Electrode (100)    Substrate (102)    Housing (104)    Electrical lead (106)    Port of the housing. (120)