Thermally stable Ag-decorated V2CTx MXene for enhanced pseudocapacitive energy storage

Arooma Syed, Zulqarnain Haider, Irfan Ali, Hu Li, Iftikhar Hussain, Kaili Zhang*, Syed Rizwan*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

Abstract

In this study, we reported the synthesis of V2CTx MXene from precursor MAX V2AlC with silver nanoparticles (Ag NPs) incorporated into the layered structure of MXene by electrostatic self-assembly method. The as-prepared electrode Ag NPs incorporated V2CTx MXene showed an outstanding specific capacitance of 618.7F/g at 1 A/g for charge storage performance in an alkaline electrolyte (1 M KOH). Owing to the conductive channel provided by the silver nanoparticles in the MXene sheet the hybrid exhibited 89 % of ion diffusion-controlled process. Electrochemical impedance spectroscopy was further conducted to investigate the kinetics and surface properties of the prepared electrodes which in the case of V2CTx MXene/Ag-NPs hybrid shows the lower charge transfer resistance (Rct, of 7.900 Ω) and solution resistance (Rs, of 789.0e-3 Ω) indicating the porosity of the material having sufficient surface area. Furthermore, the AC/Ag NPs/V2CTx asymmetric device tested for practical application demonstrated 98 % cyclic stability and 99 % coulombic efficiency for 5000 cycles at a current density of 5 A/g and a specific capacitance of 63.6F/g at 1 A/g. The V2CTx MXene/Ag-NPs electrode exhibited various interesting factors for energy storage in aqueous electrolytes. © 2025 Elsevier B.V.
Original languageEnglish
Article number159371
JournalChemical Engineering Journal
Volume505
Online published7 Jan 2025
DOIs
Publication statusPublished - 1 Feb 2025

Research Keywords

  • Ag Nanoparticles
  • Energy storage
  • MXene
  • Supercapacitor
  • Thermal stability

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