MXene/Ag2CrO4 Nanocomposite as Supercapacitors Electrode

Abstract

MXene/Ag2CrO4 nanocomposite was synthesized effectively by means of superficial low-cost co-precipitation technique in order to inspect its capacitive storage potential for supercapacitors. MXene was etched from MAX powder and Ag2CrO4 spinel was synthesized by an easy sol-gel scheme. X-Ray diffraction (XRD) revealed an addition in inter-planar spacing from 4.7 Å to 6.2 Å while Ag2CrO4 nanoparticles diffused in form of clusters over MXene layers that had been explored by scanning electron microscopy (SEM). Energy dispersive X-Ray (EDX) demonstrated the elemental analysis. Raman spectroscopy opens the gap between bonding structure of as-synthesized nanocomposite. From photoluminence (PL) spectra the energy band gap value 3.86 eV was estimated. Electrode properties were characterized by applying electrochemical observations such as cyclic voltammetry along with electrochemical impedance spectroscopy (EIS) for understanding redox mechanism and electron transfer rate constant Kapp. Additionally, this novel work will be an assessment to analyze the capacitive behavior of electrode in different electrolytes such as in acidic of 0.1 M H2SO4 has specific capacitance Csp = 525 F/g at 10 mVs−1 and much low value in basic of 1 M KOH electrolyte. This paper reflects the novel synthesis and applications of MXene/Ag2CrO4 nanocomposite electrode fabrication in energy storage devices such as supercapacitors.

Photocatalytic and Photoelectrocatalytic Water Splitting by Porous g-C3N4 Nanosheets for Hydrogen Generation

“…The difference in the electrochemical behavior one can deduce by lowering the pH of the electrolytes can lead to an increase in the conduction and hence facilitates more electrons, which results in the increment of specific capacitance (C sp ). 46 Additionally, the bode graph has been plotted to check the phase angle and transmission of an electron from the electrode. As shown in Figure 6a, g-C 3 N 4 shows a lower peak of frequency in acidic medium as compared to basic medium, which resembles the higher charge transfer and lower lifetime (τ) and can be calculated by applying τ = 1/2πf p , where f p is the peak of frequency in the bode spectrum.…”

“…As shown in Figure a, g-C 3 N 4 shows a slightly lower charge transfer resistance in the presence of acidic medium rather than basic medium. The difference in the electrochemical behavior one can deduce by lowering the pH of the electrolytes can lead to an increase in the conduction and hence facilitates more electrons, which results in the increment of specific capacitance ( C sp ) . Additionally, the bode graph has been plotted to check the phase angle and transmission of an electron from the electrode.…”

Investigation of copper/cobaltMOFsnanocomposite as an electrode material in supercapacitors

“…The EIS method is used to explore process that occurs at the electrode boundary 64,65 . EIS spectra obtained using three electrode assembly within frequency range 0.1 to 100 KHz where x‐axis represents impedance real part whereas y‐axis representing impedance imaginary part respectively 66 .…”

“…The EIS method is used to explore process that occurs at the electrode boundary. 64,65 EIS spectra obtained using three electrode assembly within frequency range 0.1 to 100 KHz where x-axis represents impedance real part whereas y-axis representing impedance imaginary part respectively. 66 Figure 9 shows Nyquist plot for Cu-MOF, Co-MOF and Co/Cu MOF nanocomposite utilizing an EIS fitted model to investigate the electron-transfer mechanism.…”

Enhanced pseudocapacitive energy storage and thermal stability of Sn2+ ion-intercalated molybdenum titanium carbide (Mo2TiC2) MXene

“…So, our assynthesized hybrid electrode showed the best charge-storage capacity of about 670 F g −1 . 70,[73][74][75][76][77][78][79] The further extended details of the comparison data are listed in Table 1 in the ESI † which includes the details of the materials and electrolytes used for electrochemical testing along with their achieved specic capacitance.…”