A nitrogenous pre-intercalation strategy for the synthesis of nitrogen-doped Ti₃C₂T_x MXene with enhanced electrochemical capacitance

Abstract

Tremendous efforts have been dedicated towards high-performance energy storage devices though material innovation, nanoscale structural design and hybrid fabrication approaches. A crucial technique to tune the properties of nanomaterials, such...

Inducing liquid crystallinity in dilute MXene dispersions for facile processing of multifunctional fibers

“…This lower volumetric capacitance and decreased rate performance for the HM x fibers is ascribed to their narrower interlayer spacing, which can hinder electrolyte diffusion into MXene's electrochemically active sites. 16,43 Lastly, Nyquist plots showed a higher ESR for HM x fibers (Fig. 8g) compared to M x fibers (Fig.…”

“…Single-layer MXene dispersions were prepared by selectively etching aluminum from the Ti 3 AlC 2 MAX phase through a minimally intensive layer delamination (MILD) method described in our previous studies. 14,18,43–47 Details of the MXene synthesis and full characterization data are provided in the ESI †. Briefly, scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray diffraction (XRD) data demonstrate successful etching of aluminum layers and exfoliation of MXene sheets (Fig.…”

“…This retention in rate performance in M x fibers, despite being lower in the MXene content is accounted for by the wider interlayer spacing, which is known to promote more efficient electrolyte/ion diffusion and exposure to a larger surface area of its electrochemically active sites. 16,43…”

“…7f), suggesting superior long-term cycling stability. Although MXene has previously demonstrated adequate chemical stability during electrochemical testing, 16,43,58 additional chemical characterizations after repeated charging–discharging cycles are needed to further assess the fibers' life-span during repeated testing in liquid electrolytes. Integration of the fibers into prototype devices and further test to evaluated the perforamance in applications are required in future studies.…”

High‐Energy Aqueous Asymmetric Supercapacitors via Synergistic Design of Electrodes Derived from Hierarchical Vanadium Dioxide Nanocomposites

“…According to the former literatures, the peak current (i) and the scan rate (υ) follow the equation of I ¼av b , and the values of a and b are related to control mode of charge storage. [42] The b-values are 0.83, 0.84, 0.85, 0.83, 0.72 and 0.69 (Figure 3f), which are approached to 1.0 thus suggesting the VO 2 @MnO 2 -6 h cathode is commanded by surface charge storage. [43] In addition, 92.7 % capacitance retention of VO 2 @MnO 2 -6 h cathode can be obtained after 10000 charge/discharge cycles (Figure S16).…”