Hydrothermal preparation of nitrogen-doped graphene sheets via hexamethylenetetramine for application as supercapacitor electrodes

• Published in: Electrochimica acta 2012-12, Vol.85, p.459-466
• Main Authors: Lee, Jeong Woo, Ko, Jang Myoun, Kim, Jong-Duk
• Format: Article
• Language: English
• Subjects: Applied sciences; Capacitors; Capacitors. Resistors. Filters; Chemistry; Current density; Electrical engineering. Electrical power engineering; Electrochemistry; Electrodes; Exact sciences and technology; General and physical chemistry; Graphene; Hexamethylenetetramine; Nitrogen-doped graphene; Oxides; Stability; Supercapacitor; Supercapacitors; Various equipment and components
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2012.08.070

[Display omitted] ► Nitrogen-doped graphene was prepared by hydrothermal reaction with graphene oxide and hexamethylenetetramine. ► Hexamethylenetetramine plays important roles in both reducing graphene oxide and doping nitrogen into the graphene sheets. ► Nitrogen-doped graphene shows a value of 161Fg−1 at a current density of 0.5Ag−1. Nitrogen-doped graphene sheets (NGS) were obtained using a simple hydrothermal reaction with graphene oxide and hexamethylenetetramine (HMT). HMT plays important roles in both reducing graphene oxide and doping nitrogen into the graphene sheets. The prepared nitrogen-doped graphene sheets reduced by hexamethylenetetramine (NGS-HMT) have a high nitrogen (8.62atom%) content, in which various nitrogen species, such as pyridinic-N, pyrrolic-N, and quaternary-N, are detected. For supercapacitor applications, NGS-HMT shows a value of 161Fg−1 at a current density of 0.5Ag−1, and it also exhibits a high cycle stability.