Facile synthesis of 3D MnNi-layered double hydroxides (LDH)/graphene composites from directly graphites for pseudocapacitor and their electrochemical analysis

• Published in: Applied surface science Vol. 429; pp. 196 - 202
• Main Authors: Lee, Ilbok, Jeong, Gyoung Hwa, An, Soyeon, Kim, Sang- Wook, Yoon, Songhun
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 31-01-2018
• Subjects: Electrochemistry; Graphene; Graphite; Layered double hydroxides; Nanostructures; Supercapacitor; Electrochemistry; Supercapacitor; Nanostructures; Graphene; Graphite; Layered double hydroxides
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.06.259

•3D MnNi-layered double hydroxides (LDH)/graphene were synthesized from graphite.
•Nanocomposite-on-graphene electrode provides fast and efficient diffusion of electrolyte ions to active material surface.•Mn1Ni3-LDH-G composite electrode shows optimum electrochemical performance.
Herein, MnNi-layered double hydroxides (LDH) were imbibed within the interlayers of graphene nanosheets. The anionic surfactant, sodium dodecyl sulfate played a role of graphite exfoliator adding interaction with metal cations. Using this process, layered MnNi-LDH-graphene nanocomposite was prepared without formation of graphene oxide. When applied into pseudocapacitor electrode, LDH-graphene with optimal ratio between Mn and Ni exhibited very stable cycle with 90% at 1400 cycles and high energy 47.29Whkg−1 at the power density of 7473Wkg−1, which was attributed to highly stable layered LDH structure within conductive graphene layers.