Open AccessElevated performance of binder-free Co3O4electrode for the supercapacitor applications
Author(s) -
Meenakshi Sharma,
Ravikant Adalati,
Ashwani Kumar,
Vikas Chawla,
Ramesh Chandra
Publication year - 2021
Publication title -
nano express
Language(s) - English
Resource type - Journals
ISSN - 2632-959X
DOI - 10.1088/2632-959x/abd686
Subject(s) - supercapacitor , pseudocapacitor , materials science , electrode , thin film , capacitance , x ray photoelectron spectroscopy , electrolyte , raman spectroscopy , electrochemistry , horizontal scan rate , analytical chemistry (journal) , chemical engineering , nanotechnology , cyclic voltammetry , chemistry , optics , physics , engineering , chromatography
In the present work, we have designed a symmetric supercapacitor (SS) device by synthesizing a pseudocapacitive binder-free cobalt oxide (Co 3 O 4 ) thin film based electrode using reactive DC magnetron sputtering technique. The thin film electrodes were characterized by x-ray diffraction, Raman spectroscopy and x-ray photoelectron spectroscopy to reveal the crystallographic details, stoichiometry, and electronic configuration, respectively. Furthermore, Co 3 O 4 thin film electrode is used for pseudocapacitor and electrochemically tested in 1M aqueous KOH electrolyte solution, in addition, a symmetric supercapacitor (SS) device was fabricated. It was found that the SS device exhibits tremendous electrochemical stability in terms of high capacitance and good cycling stability. The value of specific capacitance for Co 3 O 4 thin film electrodes and the SS device was calculated to be 392 Fg −1 and 95 Fg −1 , respectively, at a scan rate of 2 mAcm −2 . The SS device exhibits high specific energy (29 W-hkg −1 ) along with comparable good specific power (4745 Wkg −1 ). In this work, the fabricated SS device demonstrates 91.40% cyclic and capacitance retention at 8 mAcm −2 beyond 10 000 cycles. The excellent electrochemical stability and capacitive performance of the SS device suggest that it would be an ideal and potential candidate for energy storage applications in the future.