Premium
A Facile One‐Pot Hydrothermal Synthesis of Zn, Mn Co‐Doped NiCo 2 O 4 as an Efficient Electrode for Supercapacitor Applications
Author(s) -
Pradeepa S. S.,
Rajkumar P.,
Diwakar K.,
Sutharthani K.,
Subadevi R.,
Sivakumar M.
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202101708
Subject(s) - materials science , cyclic voltammetry , analytical chemistry (journal) , photoluminescence , scanning electron microscope , dielectric spectroscopy , band gap , doping , electrochemistry , field emission microscopy , hydrothermal synthesis , hydrothermal circulation , electrode , chemical engineering , chemistry , diffraction , optoelectronics , optics , physics , chromatography , composite material , engineering
A high electrochemical performance and cost effective solid state NiCo 2 O 4 material was synthesized by hydrothermal method. The performance of the supercapacitor material was investigated by incorporating the zinc and manganese in the crystal structure of NiCo 2 O 4 . The structure and morphology were confirmed by X‐ray diffraction (XRD) pattern and Field Emission Scanning Electron Microscope (FE‐SEM), and High Resolution Transmission Electron Microscope (HR‐TEM). The optical absorption spectra of the pure and co‐doped NiCo 2 O 4 were investigated by UV‐Vis analysis and the bandgap energy was found to be 4.38 and 2.98 eV respectively. Photoluminescence spectra (PL) reveal the blue and green emission peaks were found at 364, 376 and 488 nm respectively. The pore size and surface area of Mn, Zn co‐doped NiCo 2 O 4 was evaluated by Brunauer ‐Emmett –Teller analysis (BET). The cyclic voltammetry (CV) reveals the faradaic reaction of the pure and co‐doped NiCo 2 O 4 with excellent reversibility at higher scan rates. The maximum specific capacitance for pure and co‐doped NiCo 2 O 4 nanoparticles (NPs) was achieved as 158.6 and 513.17 Fg −1 respectively. Further, the electrochemical impedance spectroscopy (EIS) and galvanostatic charge discharge (GCD) were performed to identify the resistance and rate capability of the electrode materials. The cyclic stability of pure and Zn, Mn co‐doped NiCo 2 O 4 was found to be 90.8 % and 95.07 % respectively for 3000 Cycles. The Zn, Mn co‐doped NiCo 2 O 4 can be used as an excellent electrode for supercapacitor applications.