Abstract
This work reports a feasible method to fabricate a simple chemical functionalization of graphene oxide (GO) electrode. The hydrothermal synthesis of nitrogen-doped graphene quantum dots modified reduced graphene oxide (NGDQs/rGO-2) using ammonium citrate and graphene oxide (GO) as raw materials. Ammonium citrate effectively acts as a nitrogen dopant cum reducing agent for graphene which remarkably enhances its electrochemical properties. Diffraction of X-rays (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS) were employed to characterize the structure and properties of the (NGDQs/rGO-2), and the NGDQs/rGO-2 was used as the electrode to test the electrochemical performance. According to the electrochemical test results, when the molar ratio of NGDQs to rGO is 1:2, the specific capacitance can reach 357 F/g at a current density of 1 A/g; after 1000 cycles, the capacitance retention rate is 82%. For comparison, under the same current density condition, the specific capacitance of the rGO electrode is only 74 F/g. By assembling a symmetrical supercapacitor for double electrode test, the specific capacitance can reach 237 F/g at a low current density of 0.5 A/g. As the current density increases, the capacitance decreases slightly. When the current density is 1 A/g, the specific capacitance is 113 A/g. Thus, the synthesized NGDQs/rGO-2 using this simple, cost-effective, environment friendly method could be a potential candidate for high performance energy-storage applications.
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Funding
This work was financially supported by the Natural Science Foundations of Inner Mongolia Autonomous Region (No. 2018LH05020, 2018LH02003); the Inner Mongolia Science and Technology Innovation Oriented Project (No. KCBJ2018032) and Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region (NJYT23004).
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XB: Conceptualization, Methodology, Experiment, Software, Investigation, Formal Analysis, Writing—Original Draft; , JJ: Data Curation, Writing—Original Draft; K: Visualization, Investigation; YN: Resources, Supervision, Writing—Review and Editing; GF: Software, Validation; X: Visualization, Writing—Review and Editing; Z: Additional experiments Writing; RG: Conceptualization, Funding Acquisition, Resources, Supervision, Writing—Review and Editing.
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Gong, X., Yang, J., Yao, K. et al. Synthesis of 3D nitrogen-doped graphene quantum dots and reduced graphene oxide composites by a hydrothermal method for supercapacitors anodes. Ionics 29, 3273–3285 (2023). https://doi.org/10.1007/s11581-023-05057-0
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DOI: https://doi.org/10.1007/s11581-023-05057-0