Layered 2D materials have recently become an appealing choice for electrodes in supercapacitors as they offer a combination of high surface area, conductivity, flexibility, and tunability. Particularly, Ti2C MXenes provide notable advantages, such as enhanced electrical conductivity, increased surface area, exceptional electrochemical stability, and adjustable properties, rendering them exceedingly appealing for utilization in supercapacitors. In this line, we have fabricated an electrode from a commercially procured layered 2D Ti2C MXene powder and characterized it in terms of phase, composition, morphology, and electrochemical characteristics using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), scanning electron microscopic (SEM), and cyclic voltammetry techniques, respectively. X-ray diffraction data of MXene powder confirmed the presence of Ti2C MXene along with the other secondary phases corresponding to Ti2AlC MAX phase and trace impurities. Further, the SEM images revealed the presence of the layered structure in the sample. The working electrode was fabricated using a drop-casting method, where MXene powder dispersed in deionized water was mixed with a Nafion binder and drop-cast onto a porous carbon substrate. We tried various solvents, including ethanol, chloroform, hexane, and deionized water, and optimized the Ti2C powder concentration. We found that 5 mg of Ti2C per 1 mL of deionized water achieves a stable and uniform colloidal suspension. The as-fabricated Ti2C electrode exhibits a high specific capacitance of ~ 1320 F g−1 at a scan rate of 5 mV s−1. The Nyquist plots obtained from the electrochemical impedance spectroscopy (EIS) investigation were fitted to obtain important electrochemical parameters, such as solution resistance (Rs), charge transfer resistance (Rct), pseudo-capacitance (Cp), and double-layer capacitance (Cdl), with values of 2.79 Ω cm2, 237 Ω cm2, 9.77 mF/g, and 0.531 mF/g, respectively.

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Structural and Electrochemical Characteristics of Ti2C MXene for Supercapacitor Application

  • Abhay Chauhan,
  • Chandresh Kumar Rastogi,
  • Pradeep Sonker,
  • Gopal Ji,
  • Suraj Kumar Singh,
  • Vinod Verma

摘要

Layered 2D materials have recently become an appealing choice for electrodes in supercapacitors as they offer a combination of high surface area, conductivity, flexibility, and tunability. Particularly, Ti2C MXenes provide notable advantages, such as enhanced electrical conductivity, increased surface area, exceptional electrochemical stability, and adjustable properties, rendering them exceedingly appealing for utilization in supercapacitors. In this line, we have fabricated an electrode from a commercially procured layered 2D Ti2C MXene powder and characterized it in terms of phase, composition, morphology, and electrochemical characteristics using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), scanning electron microscopic (SEM), and cyclic voltammetry techniques, respectively. X-ray diffraction data of MXene powder confirmed the presence of Ti2C MXene along with the other secondary phases corresponding to Ti2AlC MAX phase and trace impurities. Further, the SEM images revealed the presence of the layered structure in the sample. The working electrode was fabricated using a drop-casting method, where MXene powder dispersed in deionized water was mixed with a Nafion binder and drop-cast onto a porous carbon substrate. We tried various solvents, including ethanol, chloroform, hexane, and deionized water, and optimized the Ti2C powder concentration. We found that 5 mg of Ti2C per 1 mL of deionized water achieves a stable and uniform colloidal suspension. The as-fabricated Ti2C electrode exhibits a high specific capacitance of ~ 1320 F g−1 at a scan rate of 5 mV s−1. The Nyquist plots obtained from the electrochemical impedance spectroscopy (EIS) investigation were fitted to obtain important electrochemical parameters, such as solution resistance (Rs), charge transfer resistance (Rct), pseudo-capacitance (Cp), and double-layer capacitance (Cdl), with values of 2.79 Ω cm2, 237 Ω cm2, 9.77 mF/g, and 0.531 mF/g, respectively.