▎ 摘　　要

NOVELTY - Preparing cobalt-modified nitrogen-doped graphene nano-belt comprises (i) dissolving the cobalt salt in deionized water, adding dicyandiamide, heating and stirring until the dicyandiamide is dissolved, and evaporating the water to obtain colloidal precursor; (ii) subjecting the colloidal precursor to heat treatment to obtain cobalt-filled nitrogen-doped multi-wall carbon nanotube; (iii) immersing the cobalt-filled nitrogen-doped multi-wall carbon nanotube in potassium hydroxide solution to obtain opening wall; and (iv) subjecting the mixture into suction filtration, washing with deionized water, and drying. USE - The nano-belt is useful for preparing electrochemical energy storage material (claimed). ADVANTAGE - The method is low cost, environmentally-friendly, safe, and easy and suitable for large-scale industrial production and requires less equipment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for cobalt-modified nitrogen-doped graphene nano-belt is prepared by above mentioned method.