▎ 摘　　要

Graphene microtube has a robust potential application in gas separation, catalysis, water treatment and electronics. At present it remains two big challenges: high persistence of the tubular structure and high quality of the microtube. Here, a novel electrochemical technique was proposed, in which graphene oxides can be simultaneously deposited and reduced on a template wire at room temperature. After removing the template, the tubular structure was formed and complied well with the shape of the template. Moreover, the tube wall is composed of highly aligned graphene sheets. These combined characters bring about excellent flexibility and electrochemical properties, e.g., the specific capacitance of the graphene microtube is 2.5 times the value of the graphene fiber with the same sectional area. (C) 2017 Elsevier Ltd. All rights reserved.