TY - JOUR
T1 - Synthesis and characterization of Nb-doped strontium cobaltite@GQD electrodes for high performance supercapacitors
AU - Kharangarh, Poonam R.
AU - Ravindra, Nuggehalli M.
AU - Singh, Gurmeet
AU - Umapathy, Siva
N1 - Funding Information:
The authors acknowledge the financial support from the Department of Science & Technology, New Delhi, India, under Women Scientists Scheme-A (WOS-A), reference number (SR/WOS-A/PM-107/2017). The authors thank Prof. S. Annapoorni, Department of Physics and Astrophysics, University of Delhi, for providing us support during the pandemic. The support of USIC, Department of Chemistry, University of Delhi and AIIMS, Delhi in providing various characterization techniques is acknowledged with thanks. The authors thank Prof. R.K. Sharma, Department of Chemistry, and University of Delhi for facilitating the electrochemical measurements.
Funding Information:
The authors acknowledge the financial support from the Department of Science & Technology , New Delhi, India, under Women Scientists Scheme-A (WOS-A), reference number ( SR/WOS-A/PM-107/2017 ). The authors thank Prof. S. Annapoorni, Department of Physics and Astrophysics, University of Delhi, for providing us support during the pandemic. The support of USIC, Department of Chemistry, University of Delhi and AIIMS, Delhi in providing various characterization techniques is acknowledged with thanks. The authors thank Prof. R.K. Sharma, Department of Chemistry, and University of Delhi for facilitating the electrochemical measurements.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/11/1
Y1 - 2022/11/1
N2 - In this study, the fabrication and characterization of Nb-doped strontium cobaltite, SrCo0.9Nb0.1O3-δ (SCN), with a significant concentration of oxygen vacancies, as a charge storage material, prepared using sol-gel method, is reported. The results obtained show that the diffusion of oxygen ions is a rate limiting factor for charge storage. The perovskite material, niobium doped strontium cobalitite, on nano graphene sheets such as SCN@GQDs, has been prepared. The Graphene Quantum Dots (GQDs) have been synthesized by using a facile hydrothermal method. The morphology of SCN@GQDs was characterized by FESEM, and TEM. Additional characterization techniques such as PXRD, Raman Spectroscopy, FTIR, TGA/DTA, and BET were performed to observe the structure, porosity, functional groups, defects and thermal behavior of the material. The prepared SCN@GQDs act as an effective electrode material and exhibit high energy density. These SCN@GQD electrodes have been investigated for their electro-chemical properties. The specific capacitance of the synthesized perovskite materials, at 0.1 Ag−1 for supercapacitor, is higher than those of GQDs and SCN due to the improved conductivity, presence of oxygen vacancies and fast ion diffusion between the working electrodes and electrolyte. These properties of SCN@GQD perovskite material, with nanographene sheets, for boosting the capacity of electrodes, provide excellent opportunities for applications in supercapacitors. This perovskite material is superior in comparison to other candidates due to its larger oxygen vacancy concentration and higher oxygen-ion mobility.
AB - In this study, the fabrication and characterization of Nb-doped strontium cobaltite, SrCo0.9Nb0.1O3-δ (SCN), with a significant concentration of oxygen vacancies, as a charge storage material, prepared using sol-gel method, is reported. The results obtained show that the diffusion of oxygen ions is a rate limiting factor for charge storage. The perovskite material, niobium doped strontium cobalitite, on nano graphene sheets such as SCN@GQDs, has been prepared. The Graphene Quantum Dots (GQDs) have been synthesized by using a facile hydrothermal method. The morphology of SCN@GQDs was characterized by FESEM, and TEM. Additional characterization techniques such as PXRD, Raman Spectroscopy, FTIR, TGA/DTA, and BET were performed to observe the structure, porosity, functional groups, defects and thermal behavior of the material. The prepared SCN@GQDs act as an effective electrode material and exhibit high energy density. These SCN@GQD electrodes have been investigated for their electro-chemical properties. The specific capacitance of the synthesized perovskite materials, at 0.1 Ag−1 for supercapacitor, is higher than those of GQDs and SCN due to the improved conductivity, presence of oxygen vacancies and fast ion diffusion between the working electrodes and electrolyte. These properties of SCN@GQD perovskite material, with nanographene sheets, for boosting the capacity of electrodes, provide excellent opportunities for applications in supercapacitors. This perovskite material is superior in comparison to other candidates due to its larger oxygen vacancy concentration and higher oxygen-ion mobility.
KW - Graphene quantum dots
KW - Hydrothermal method
KW - KFeCN electrolyte
KW - Nb-doped strontium cobaltite (SCN)
KW - Supercapacitor electrode
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U2 - 10.1016/j.est.2022.105388
DO - 10.1016/j.est.2022.105388
M3 - Article
AN - SCOPUS:85136168016
SN - 2352-152X
VL - 55
JO - Journal of Energy Storage
JF - Journal of Energy Storage
M1 - 105388
ER -