▎ 摘　　要

NOVELTY - The method comprises: (i) forming a metal catalyst layer on a support surface; (ii) forming graphene on the metal catalyst layer; (iii) forming carbon nanowires on a surface of the graphene; and (iv) separating a three-dimensional carbon structure consisting of the carbon nanowires and the graphene from the support substrate. A thickness of the metal catalyst layer is 10-500 nm. The step (ii) is performed, in the presence of methanol or ethanol, at a temperature of 850-950 degrees C and a pressure of 2-760 Torr for 10 minutes to 4 hours. The step (ii) is accomplished at a temperature of 650-850 degrees C. USE - The method is useful for fabricating a three-dimensional carbon structure (claimed), which is useful in a secondary battery, a super-capacitor, a catalyst supporter and an electrode material. ADVANTAGE - The method is capable of fabricating the three-dimensional carbon structure without using metallic catalyst. DETAILED DESCRIPTION - The method comprises: (i) forming a metal catalyst layer on a support surface; (ii) forming graphene on the metal catalyst layer; (iii) forming carbon nanowires on a surface of the graphene; and (iv) separating a three-dimensional carbon structure consisting of the carbon nanowires and the graphene from the support substrate. A thickness of the metal catalyst layer is 10-500 nm. The step (ii) is performed, in the presence of methanol or ethanol, at a temperature of 850-950 degrees C and a pressure of 2-760 Torr for 10 minutes to 4 hours. The step (ii) is accomplished at a temperature of 650-850 degrees C. The step (iv) comprises calcining the metal catalyst layer by acid treatment at an acid concentration of 1-10 vol.%. The method further comprises: (6) coating a metal oxide on the carbon nanowires; and (7) adding hydrogen gas to the three-dimensional structure to reduce the metal oxide. The supporter is present in two-dimensional form or three-dimensional form. A particle size of the metal oxide is 1-100 nm. The step (iv) is accomplished, in the presence of a hydrocarbon compound that is present in an amount of 0.1-10 vol.%, for 1 minute to 2 hours. A concentration of the hydrogen gas is 1-10 vol.%.