Direct growth of 2D nickel hydroxide nanosheets intercalated with polyoxovanadate anions as a binder-free supercapacitor electrode

A mesoporous nanoplate network of two-dimensional (2D) layered nickel hydroxide Ni(OH)2 intercalated with polyoxovanadate anions (Ni(OH)2-POV) was built using a chemical solution deposition method. This approach will provide high flexibility for controlling the chemical composition and the pore stru...

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Bibliographic Details
Published in:Nanoscale 2018-01, Vol.10 (19), p.8953-8961
Main Authors: Gunjakar, Jayavant L, Inamdar, Akbar I, Hou, Bo, Cha, SeungNam, Pawar, S M, Abu Talha, A A, Chavan, Harish S, Kim, Jongmin, Cho, Sangeun, Lee, Seongwoo, Jo, Yongcheol, Kim, Hyungsang, Im, Hyunsik
Format: Article
Language:English
Subjects:
Anions
Chemical composition
Electrochemical analysis
Electrodes
Nanomaterials
Nanosheets
Nickel compounds
Porosity
Supercapacitors
Thin films
Transmission electron microscopy
X ray powder diffraction
X-ray diffraction
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Summary:A mesoporous nanoplate network of two-dimensional (2D) layered nickel hydroxide Ni(OH)2 intercalated with polyoxovanadate anions (Ni(OH)2-POV) was built using a chemical solution deposition method. This approach will provide high flexibility for controlling the chemical composition and the pore structure of the resulting Ni(OH)2-POV nanohybrids. The layer-by-layer ordered growth of the Ni(OH)2-POV is demonstrated by powder X-ray diffraction and cross-sectional high-resolution transmission electron microscopy. The random growth of the intercalated Ni(OH)2-POV nanohybrids leads to the formation of an interconnected network morphology with a highly porous stacking structure whose porosity is controlled by changing the ratio of Ni(OH)2 and POV. The lateral size and thickness of the Ni(OH)2-POV nanoplates are ∼400 nm and from ∼5 nm to 7 nm, respectively. The obtained thin films are highly active electrochemical capacitor electrodes with a maximum specific capacity of 1440 F g-1 at a current density of 1 A g-1, and they withstand up to 2000 cycles with a capacity retention of 85%. The superior electrochemical performance of the Ni(OH)2-POV nanohybrids is attributed to the expanded mesoporous surface area and the intercalation of the POV anions. The experimental findings highlight the outstanding electrochemical functionality of the 2D Ni(OH)2-POV nanoplate network that will provide a facile route for the synthesis of low-dimensional hybrid nanomaterials for a highly active supercapacitor electrode.
ISSN:2040-3364
2040-3372
DOI:10.1039/c7nr09626g