▎ 摘　　要

NOVELTY - Preparing rod-shaped cobalt tetraoxide/graphene nano composite material comprises (1) mixing graphite flakes, sodium nitrate and concentrated sulfuric acid for 30 minutes to obtain a mixture a, (2) under the condition of ice water bath, adding potassium permanganate to the mixture a obtained in the step (1), stirring for 12 hours, adding deionized water, stirring for 12 hours, stirring with hydrogen peroxide for 24 hours to obtain mixture b, (3) washing mixture b with distilled water for 5-6 times, and freeze-drying to obtain graphene oxide, (4) uniformly mixing cobalt nitrate, urea, and graphene oxide in 40 ml deionized water, washing and heating to obtain solid product c, and (5) freeze-drying solid product c, calcining under argon atmosphere to obtain nanorod-shaped cobalt tetraoxide/graphene composite material. USE - The method is useful for preparing rod-shaped cobalt tetraoxide/graphene nano composite material. ADVANTAGE - The method is simple. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for nanorod-shaped cobalt tetraoxide/graphene nano composite material.