Nitrogen-doped carbon quantum dots (N-CQDs)/Co3O4 nanocomposite for high performance supercapacitor
| Autor: | Jahangeer Ahmed, Mu. Naushad, Ayman Abdel Ghafar, Khalid M. Alsheetan, Mohd Ubaidullah, Prabhakarn Arunachalam, Tansir Ahamad |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Supercapacitor
Metal oxide Multidisciplinary Nanocomposite Materials science 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Capacitance Hydrothermal route Chemical engineering Energy storage and conversion Specific surface area Electrochemical studies Nitrogen doped carbon quantum dots Cyclic voltammetry 0210 nano-technology lcsh:Science (General) Cobalt oxide Current density 0105 earth and related environmental sciences Power density lcsh:Q1-390 |
| Zdroj: | Journal of King Saud University: Science, Vol 33, Iss 1, Pp 101252-(2021) |
| ISSN: | 1018-3647 |
| Popis: | The search of low cost, highly competent electrode material is the hot research area for various next-gen applications. Herein, cost effective nitrogen doped carbon quantum dots (N-CQDs) anchored in cobalt oxide (Co3O4) nanocomposite was fabricated through a simple hydrothermal method. The fabricated N-CQDs/Co3O4 nanocomposite showed high specific surface area (BET) of ~880 m2 g−1 with BJH pore size and volume of ~21 nm, 0.81945 cm3 g−1 respectively. The electrochemical performance through cyclic voltammetry (CV) in 3-electrode systems exhibited an improved specific capacitance of 1782 F g−1 at 5 mV s−1 in 6 M KOH electrolyte. Additionally, galvanostatic charge–discharge (GCD) analysis showed an improved capacitive performance with a specific capacitance of 1867 F g−1 at 1 A g−1 current density. The energy density was calculated 36.9 Wh kg−1 at the power density of 480 W kg−1. The capacitance retention graph demonstrates 96% stability through 500 GCD cycles. |
| Databáze: | OpenAIRE |
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