Graphitization induced by KOH etching for the fabrication of hierarchical porous graphitic carbon sheets for high performance supercapacitors

Abstract

Porous graphitic carbons are promising candidates for energy conversion and storage.

Supercapacitor Electrodes from Viscose-Based Activated Carbon Fibers: Significant Yield and Performance Improvement Using Diammonium Hydrogen Phosphate as Impregnating Agent

“…Except for ACF4, all analyzed samples show a highly capacitive behavior, which is evident from the steep lines at low frequencies [36]. The Nyquist plots show a depressed semicircle in the high frequency region related to the faradaic charge-discharge resistance [37]. The larger the semicircle, the greater the corresponding resistance.…”

Bimetallic Pd96Fe4 nanodendrites embedded in graphitic carbon nanosheets as highly efficient anode electrocatalysts

“…60,61 Many advanced techniques, including activation, helium ion bombardment, the template method, mechanical/chemical exfoliation, chemical vapour deposition, etc., have been developed to fabricate carbonaceous nanosheets but establishing an efficient and facile synthesis methodology for 2D porous carbon nanosheets would be of great benet for their large scale production. [62][63][64][65] Mesocarbon microbeads (MCMBs) are one of the commercially available conducting carbon materials with good thermal and chemical stability and high crystallinity that are widely utilized for cost-effective electromagnetic interference shielding application, supercapacitors, and as an anode material in lithium-ion batteries and a supporting material for fuel cell applications. 66,67 It is worth mentioning that there is no report in the literature on the synthesis of carbon nanosheets using MCMBs as the carbon source and this motivated us to develop a facile one-pot synthesis for metal deposited carbon nanosheets as multifunctional electrocatalysts.…”

Crystalline Co2V3O8@Amorphous Co−B Core‐Shell Nano‐Microsphere: Tunable Shell Layer Thickness, Faradaic Pseudocapacitive Mechanism, and Electrochemical Capacitor Applications

“…Table 2 indicates the fitting data of equivalent circuit elements for Co 3 V 2 O 8 , Co−B, and Co 3 V 2 O 8 @Co−B electrodes. In Figure 5e, at the characteristic frequency corresponding to the −45° phase angle on the vertical axis of the Bode plot, the resistive impedance and the capacitive impedance are equal [49] . According to the equation τ=1/f to calculate the relaxation time, [50] it can be seen that among the Co 3 V 2 O 8 @Co−B samples, the Co 3 V 2 O 8 @Co−B‐2 electrode has the largest frequency and the smallest time constant, which indicates that the electrode presents a better electrochemical character.…”