▎ 摘　　要

NOVELTY - Preparing macroporous crosslinked carbon electrode material with carbon nanofiber comprises collecting waste cotton stalk, cutting cotton stalk skin into 3-5 cm long small sections, placing into a beaker with deionized water, placing into an ultrasonic cleaning instrument for ultrasonic washing, taking out and placing in blast drying box for drying, placing dried cotton stalk in a crusher to crushing and sieving to obtain cotton stalk powder, taking cotton stalk flour in the beaker, adding sodium hydroxide solution or potassium hydroxide solution, adding de-ionizing water, stirring and then turning to hydrothermal synthesis reaction kettle, covering hydrothermally reaction kettle cover, placing reaction kettle in the blast drying tank at 130-150℃ for 2-4 hours, then cooling, placing a sample obtained after the reaction in the sand core funnel for filtering, soaking and washing obtained solid substance. USE - The method is useful for preparing macroporous crosslinked carbon electrode material with carbon nanofiber, which is useful in super capacitor (claimed) as electric energy storage device in national construction and social life. ADVANTAGE - The method has simple operation, low calcining temperature, saves energy requirement of carbonization, reduces emission of carbon dioxide, and is easy to popularize, apply, and economical. The graphene carbon nano-sheet macroporous crosslinked cotton stalk biomass carbon electrode material has rich hole structure and excellent electrochemical performance.