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Reverse Micelle Synthesis of Colloidal Nickel–Manganese Layered Double Hydroxide Nanosheets and Their Pseudocapacitive Properties
Author(s) -
Sim Hwansu,
Jo Changshin,
Yu Taekyung,
Lim Eunho,
Yoon Songhun,
Lee Jung Heon,
Yoo Jibeom,
Lee Jinwoo,
Lim Byungkwon
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201403991
Subject(s) - nickel , hydroxide , layered double hydroxides , materials science , manganese , x ray photoelectron spectroscopy , colloid , pseudocapacitor , inorganic chemistry , micelle , chemical engineering , hydrotalcite , oleylamine , nanoparticle , chemistry , supercapacitor , nanotechnology , catalysis , organic chemistry , metallurgy , capacitance , electrode , aqueous solution , engineering
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 [Ni 3 Mn(OH) 8 ](Cl − ) ⋅ n H 2 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.