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Nanoflake‐Modulated La 2 Se 3 Thin Films Prepared for an Asymmetric Supercapacitor Device
Author(s) -
Patil Swati J.,
Bulakhe Ravindra N.,
Lokhande Chandrakant D.
Publication year - 2015
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201500009
Subject(s) - cyclic voltammetry , supercapacitor , materials science , dielectric spectroscopy , raman spectroscopy , electrode , electrochemistry , horizontal scan rate , contact angle , electrolyte , thin film , capacitance , aqueous solution , analytical chemistry (journal) , wetting , chemical engineering , scanning electron microscope , fourier transform infrared spectroscopy , nanotechnology , chemistry , composite material , optics , organic chemistry , physics , engineering
La 2 Se 3 nanoflakes were prepared from an aqueous medium by means of a chemical‐bath deposition method and were later utilized as a supercapacitor electrode. X‐ray diffraction (XRD), Fourier transform Raman (FT Raman), field‐emission scanning electron microscopy (FESEM), and contact‐angle measurement techniques were used to study the structural, morphological, and wettability properties of La 2 Se 3 films. The XRD study confirmed the cubic crystal structure of the La 2 Se 3 film. The surface morphology and wettability studies revealed the nanoflake morphology with a hydrophilic surface, which could be beneficial to electrochemical reactions. The electrochemical performance of the La 2 Se 3 nanoflakes was evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques. The La 2 Se 3 nanoflake electrode exhibited a maximum specific capacitance of 331 F g −1 at a scan rate of 5 mV s −1 . An electrochemical impedance study confirmed that the La 2 Se 3 nanoflake electrode has a better supercapacitive behavior in an aqueous electrolyte. The asymmetric supercapacitor device based on the La 2 Se 3 electrode in aqueous electrolyte exhibited good specific capacitance, excellent charge/discharge properties, and superior long‐term cycling stability.