▎ 摘　　要

NOVELTY - Preparing nitrogen-doped axial carbon fiber/graphene loaded cobalt nano electrocatalyst involves using cellulose and nitrogen sources as raw materials, high-temperature in-situ carbonization to form graphene fiber axial composite nitrogen-doped graphene sheet structure, while loading Co nanoparticles to obtain Mott-Schottky heterojunction. The cellulose adopts bacterial cellulose, and the nitrogen source is melamine and urea, then calcined under the protection of nitrogen. The calcining temperature is controlled to be 700-1200 degrees C, and the temperature is naturally cooled to obtain the axial composite nanomaterial of powdered carbon fiber and nitrogen-doped graphene. The obtained carbon fiber and nitrogen-doped graphene axial composite nanopowder are added to deionized water, and ultrasonically dispersed for 0.5 hours. The cobalt salt precursor is added, and stirred and dispersed to obtain a solution. USE - Method for preparing nitrogen-doped axial carbon fiber/graphene loaded cobalt nano electrocatalyst used in electrocatalytic hydrogen production (Claimed). ADVANTAGE - The method has the advantages of simple process, easy control, green and safe, and can realize macro preparation, and nitrogen-doped axial carbon fiber/graphene-supported cobalt nano electrocatalyst has higher catalytic activity and shows higher electrocatalytic hydrogen production rate under different scanning speeds. DETAILED DESCRIPTION - Preparing nitrogen-doped axial carbon fiber/graphene loaded cobalt nano electrocatalyst involves using cellulose and nitrogen sources as raw materials, high-temperature in-situ carbonization to form graphene fiber axial composite nitrogen-doped graphene sheet structure, while loading Co nanoparticles to obtain Mott-Schottky heterojunction. The cellulose adopts bacterial cellulose, and the nitrogen source is melamine and urea, then calcined under the protection of nitrogen. The calcining temperature is controlled to be 700-1200 degrees C, and the temperature is naturally cooled to obtain the axial composite nanomaterial of powdered carbon fiber and nitrogen-doped graphene. The obtained carbon fiber and nitrogen-doped graphene axial composite nanopowder are added to deionized water, and ultrasonically dispersed for 0.5 hours. The cobalt salt precursor is added, and stirred and dispersed to obtain a solution, then transferred the solution into a hydrothermal reactor and hydrothermally at 140 degrees C for 4 hours. The hydrothermal reaction is over, then added the reducing agent dropwise and adjusted the pH value of the solution to 10 with ammonia water, sealed the reaction kettle again, and performed the hydrothermal reduction reaction at 110-180 degrees C for 24 hours. The reaction mixture is cooled to room temperature, then centrifugal separation, repeated washing with water, and vacuum dried at 60 degrees C for 2 hours, and obtained nitrogen-doped axial carbon fiber/graphene loaded cobalt nano electrocatalyst.