TY - JOUR
T1 - Graphene quantum dots decorated on spinel nickel cobaltite nanocomposites for boosting supercapacitor electrode material performance
AU - Kharangarh, Poonam R.
AU - Ravindra, Nuggehalli M.
AU - Rawal, Rachna
AU - Singh, Amrita
AU - Gupta, Vinay
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/9/25
Y1 - 2021/9/25
N2 - Composites of transition metal oxides, with carbon, have been considered to be appropriate materials for enhancing their electrochemical properties in supercapacitor applications. In this study, we prepare Nickel-Cobaltite/ Graphene Quantum Dots (NiCo2O4/GQDs) composite structures that exhibit improved electrical conductivity and function as electrode materials with higher energy density in comparison to GQDs and NiCo2O4. The electrochemical performance of NiCo2O4/GQDs is confirmed through galvanostatic charge–discharge method for three electrode systems with an electrolyte of 0.1 M potassium hydroxide. The observed specific capacitance for the fabricated composite has been found to be 481.4 Fg−1 at 0.35Ag−1. It is higher than that of Graphene Quantum Dots (Csp~45.6 Fg−1). This is due to the enhancement in the electrical conductivity and diffusion of ions which become faster between electrodes and electrolyte. These findings demonstrate the unique characteristics of the fabricated composites as superior electrode materials for applications in supercapacitors.
AB - Composites of transition metal oxides, with carbon, have been considered to be appropriate materials for enhancing their electrochemical properties in supercapacitor applications. In this study, we prepare Nickel-Cobaltite/ Graphene Quantum Dots (NiCo2O4/GQDs) composite structures that exhibit improved electrical conductivity and function as electrode materials with higher energy density in comparison to GQDs and NiCo2O4. The electrochemical performance of NiCo2O4/GQDs is confirmed through galvanostatic charge–discharge method for three electrode systems with an electrolyte of 0.1 M potassium hydroxide. The observed specific capacitance for the fabricated composite has been found to be 481.4 Fg−1 at 0.35Ag−1. It is higher than that of Graphene Quantum Dots (Csp~45.6 Fg−1). This is due to the enhancement in the electrical conductivity and diffusion of ions which become faster between electrodes and electrolyte. These findings demonstrate the unique characteristics of the fabricated composites as superior electrode materials for applications in supercapacitors.
KW - Graphene quantum dots
KW - Hydrothermal method
KW - Nickel-cobaltite/graphene quantum dots
KW - Potassium hydroxide
KW - Supercapacitor electrode
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U2 - 10.1016/j.jallcom.2021.159990
DO - 10.1016/j.jallcom.2021.159990
M3 - Article
AN - SCOPUS:85105265262
SN - 0925-8388
VL - 876
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 159990
ER -