title: Reverse micelle synthesis of colloidal nickel-manganese layered double hydroxide nanosheets and their pseudocapacitive properties.
abstract: Colloidal nanosheets of nickel-manganese layered double hydroxides (LDHs) have been synthesized in high yields through a facile reverse micelle method with xylene as an oil phase and oleylamine as a surfactant. Electron microscopy studies of the product revealed the formation of colloidal nanoplatelets with sizes of 50-150 nm, and X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy studies showed that the Ni-Mn LDH nanosheets had a hydrotalcite-like structure with a formula of [Ni3 Mn(OH)8 ](Cl(-) )⋅n H2 O. We found that the presence of both Ni and Mn precursors was required for the growth of Ni-Mn LDH nanosheets. As pseudocapacitors, the Ni-Mn LDH nanosheets exhibited much higher specific capacitance than unitary nickel hydroxides and manganese oxides.
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University (SKKU), Suwon 440-746 (Korea).
authors.forename: Hwansu
authors.initials: H
authors.lastname: Sim
authors.forename: Changshin
authors.initials: C
authors.lastname: Jo
authors.forename: Taekyung
authors.initials: T
authors.lastname: Yu
authors.forename: Eunho
authors.initials: E
authors.lastname: Lim
authors.forename: Songhun
authors.initials: S
authors.lastname: Yoon
authors.forename: Jung Heon
authors.initials: JH
authors.lastname: Lee
authors.forename: Jibeom
authors.initials: J
authors.lastname: Yoo
authors.forename: Jinwoo
authors.initials: J
authors.lastname: Lee
authors.forename: Byungkwon
authors.initials: B
authors.lastname: Lim
keywords: layered double hydroxide; manganese; nickel; pseudocapacitor; synthesis