▎ 摘　　要

NOVELTY - Preparing graphene nanoribbons comprises etching dilute acid solution on a metal substrate, heating the substrate, passing ethane, propane, acetylene and ethanol through a reactor to obtain carbon nano-wall surface of the metal substrate and then reacting and cooling, scraping the carbon nanowall on a surface of the metal substrate, placing the carbon nanowalls powder on a current collector and then pressing into a sheet, immersing the working electrode in a common electrolyte and then reacting to obtain electrolyte solution and then filtering, and washing the filter residue and drying. USE - The method is useful for preparing graphene nanoribbons (claimed). ADVANTAGE - The method is capable of preparing the graphene nanoribbons with good quality and temperature resistance and uniform size. DETAILED DESCRIPTION - Preparing graphene nanoribbons comprises (a) etching a dilute acid solution on a metal substrate under oxygen and protective gas atmosphere, heating the metal substrate to 600-900 degrees C under UV light irradiation, passing ethane, propane, acetylene and ethanol through a catalytic chemical vapor deposition reactor for 30-300 minutes to form carbon nano-wall on surface of the metal substrate and then reacting and cooling to room temperature, and scraping the carbon nanowall on the surface of the metal substrate to obtain carbon nanowall powder, (b) placing the carbon nanowall powder on a current collector and then pressing into a sheet to obtain a carbon nanowall working electrode including a counter electrode and a reference electrode, and (c) immersing the working electrode in a common electrolyte and then reacting at room temperature for 1-20 hours and current density of 2-100 mA/cm2 to obtain electrolyte solution and then filtering, washing the filter residue and then drying to obtain intercalated carbon nanowall, and immersing the intercalated carbon nanowall in liquid nitrogen, liquid argon and liquid hydrogen and then heating at 800-1000 degrees C for 30-300 minutes and then cooling.