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Bouquet‐Like NiCo 2 O 4 @CoNi 2 S 4 Arrays for High‐Performance Pseudocapacitors
Author(s) -
He Yahui,
Xiao Xin,
Gao Lin,
Li Shaohui,
Shen Yan
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600843
Subject(s) - pseudocapacitor , x ray photoelectron spectroscopy , materials science , nanoneedle , scanning electron microscope , heterojunction , transmission electron microscopy , ternary operation , cyclic voltammetry , electrochemistry , exfoliation joint , supercapacitor , nanotechnology , analytical chemistry (journal) , chemical engineering , optoelectronics , chemistry , electrode , nanostructure , composite material , graphene , chromatography , computer science , engineering , programming language
The bouquet‐like NiCo 2 O 4 @CoNi 2 S 4 ternary heterostructure on nickel foam is successfully synthesized through a hydrothermal method and electrodeposition. CoNi 2 S 4 nanosheets uniformly cover the surface of nanoneedle‐like NiCo 2 O 4 arrays. The as‐prepared NiCo 2 O 4 @CoNi 2 S 4 material was characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), and X‐ray diffraction (XRD). Their electrochemical performance was tested by using cyclic voltammetry (CV) and galvanostatic charge‐discharge (GCD) methods. The bouquet‐like NiCo 2 O 4 @CoNi 2 S 4 material with a ternary heterostructure shows the advantages of fast electron and ion transport, a large electroactive surface, and a remarkable areal capacitance (6.25 F cm −2 at current density of 2 mA ⋅ cm −2 ), which suggests NiCo 2 O 4 @CoNi 2 S 4 is a promising material in practical application for pseudocapacitors.