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Facile Hydrothermal Synthesis and First Principle Computational Studies of NiSb 2 O 4 and Its Electrochemical Properties with Ni 3 (Fe(CN) 6 ) 2 (H 2 O) for Hybrid Supercapacitors
Author(s) -
Shanmugavani Amirthalingam,
Lalitha Murugan,
Yuvaraj Subramanian,
Vasylechko Leonid,
Meyrick Danielle,
Senthilkumar Lakshmipathi,
Selvan Ramakrishnan Kalai
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700893
Subject(s) - supercapacitor , tetragonal crystal system , capacitance , materials science , electrochemistry , rietveld refinement , electrode , cyclic voltammetry , analytical chemistry (journal) , crystallography , hydrothermal circulation , nanotechnology , crystal structure , chemistry , chemical engineering , chromatography , engineering
To realize the ideal electrode material for supercapacitors, the scientific community has been prompted to investigate a variety of materials. This study deals with the hydrothermal synthesis of NiSb 2 O 4 for the first time for application to hybrid supercapacitors. First‐principles density functional theory (DFT) calculations are employed to study the electronic structure of synthesized NiSb 2 O 4 . The single phase tetragonal structure NiSb 2 O 4 is revealed from X‐ray diffraction (XRD) analysis. Rod‐like micron‐sized structures are revealed through field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analysis. Structural parameters and unit cell dimensions are deduced from Rietveld refinement analysis. The comparative effects of various K + electrolytes (1 M KOH, 1 M KCl, 1 M KNO 3 and 0.5 K 2 SO 4 ) on the NiSb 2 O 4 negative electrode material are studied. Cyclic voltammogram (CV) showed greatest specific capacitance of 758 F g −1 at 2 mV s −1 in 1 M KOH. Galvanostatic charge‐discharge analysis (GCD) exhibited capacitance of 382 F g −1 at 1 A g −1 . The asymmetric supercapacitor is assembled with synthesized Ni 3 (Fe(CN) 6 ) 2 (H 2 O) as positive electrode and the device exhibits a specific capacitance of 344 F g −1 at 1 mV s −1 in 1 M KOH in the wider potential window of 1.6 V, suggesting its potential application as an energy storage device.