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Oxidative Intercalation for Monometallic Ni 2+ ‐Ni 3+ Layered Double Hydroxide and Enhanced Capacitance in Exfoliated Nanosheets
Author(s) -
Gu Feng,
Cheng Xing,
Wang Shufen,
Wang Xu,
Lee Pooi See
Publication year - 2015
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201402603
Subject(s) - nanosheet , supercapacitor , materials science , intercalation (chemistry) , hydroxide , capacitance , electrochemistry , chemical engineering , electrode , faraday efficiency , graphene , nanotechnology , carbon nanotube , metal hydroxide , layered double hydroxides , inorganic chemistry , chemistry , engineering
Monometallic Ni 2+ ‐Ni 3+ layered double hydroxide (LDH) is prepared using a simple oxidative intercalation process and may be further exfoliated into positively charged Ni(OH) 2 unilamellar sheets. The superior capacitive behavior of the unilamellar sheets stranded in carbon nanotubes (CNTs) networks is achieved because of the complete interfacial charge storage arising from the confined Faradaic reactions at the interfacial region. 3D nanosheet/CNT composites are prepared using an in situ electrostatic assembly of positive charged sheets with CNTs bearing negative charges. The restacking of active nanosheets during electrochemical cycling is effectively prohibited. Consequently, the outstanding specific capacitance and remarkable rate capability of the nanosheet/CNT hybrid electrodes are demonstrated, making them promising candidates for high performance supercapacitors, combining high‐energy storage densities with high levels of power delivery.