Hollow graphene spheres self-assembled from graphene oxide sheets by a one-step hydrothermal process

• Published in: Carbon (New York) Vol. 56; pp. 389 - 391
• Main Authors: Cao, Jianyun, Wang, Yaming, Xiao, Ping, Chen, Yingchun, Zhou, Yu, Ouyang, Jia-Hu, Jia, Dechang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.05.2013; Elsevier
• Subjects: Capacitors; Carbon; Cross-disciplinary physics: materials science; rheology; Cycles; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Graphene; Image transmission; Ion beams; Materials science; Methods of nanofabrication; Oxides; Physics; Scanning electron microscopy; Self-assembly; Specific materials; Scanning electron microscopy; Stability; Aqueous suspension; Self-assembled layers; Focused ion beam technology; Hydrothermal growth; Self-assembly; Hollow shape; Transmission electron microscopy; Hydrothermal synthesis; Graphene; Capacitance; Mercury sulfide; Graphene oxide; Structure; Diameter
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2012.12.075

We developed a one-step hydrothermal method to assemble graphene oxide (GO) sheets into hollow graphene spheres (HGSs), using only a GO/H2SO4 aqueous suspension as the starting material. Scanning electron microscope, focused ion beam scanning electron microscope and transmission electron microscope images show that the as-prepared HGSs vary from 1 to 3μm in diameter and have a hollow interior structure. The as-prepared HGSs show a high capacitance of 207Fg−1, as well as good rate capability and cycling stability when used as electrode materials for supercapacitors.