Microfluidic fabrication of hierarchically porous superconductive carbon black/graphene hybrid fibers for wearable supercapacitor with high specific capacitance

High-Energy-Density Asymmetric Supercapacitor Based on a Nickel Cobalt Double Hydroxide/Reduced-Graphene-Oxide Fiber Electrode

“…Generally speaking, GO and its product reduced at low temperature have high defect density, belonging to stage II . Obviously, the I D / I G value of the GOFs is larger than that of the GOFs, which means an increased sp 2 bonded carbon domain after HI reduction, and this result has been reported in many wet-spinning works about GO. ,, …”

“…52 Obviously, the I D /I G value of the GOFs is larger than that of the GOFs, which means an increased sp 2 bonded carbon domain after HI reduction, and this result has been reported in many wetspinning works about GO. 44,53,54 FTIR spectroscopy was used to detect the change of surface functional groups before and after reduction. As shown in Figure 2i, a large number of oxygen-containing functional groups are removed after reduction, such as C=O on 1722 cm −1 , C−O−H on 1350 cm −1 , and epoxy C−O on 1160 cm −1 .…”

Enhancing Electron/Ion Transport in SnO2 Quantum Dots Decorated Polyaniline/Graphene Hybrid Fibers for Wearable Supercapacitors with High Energy Density

“…The specific areal capacitance ( C , mF cm –2 ), energy density ( E ), and power energy ( P ) are usually calculated by C = 4 I normalΔ t A normalΔ V , E = C V 2 8 , and P = E normalΔ t . Among them, I , Δ t , Δ V , A , and V are discharge current (mA), discharge time (s), voltage range (V), total surface area of the two electrodes (cm 2 ), and operating voltage (V), respectively. − …”

All-pseudocapacitive coordination towards flexible asymmetric fiber-shaped supercapacitors with ultrahigh energy and power density

“…18 Even after electrode structure optimization, the vertically oriented graphene nanoribbon fibers have a volumetric capacitance of 234.8 F cm −3 at 2 mV s −1 , 19 and carbon black/graphene hybrid fibers prepared by microfluidic spinning show a specific capacitance of 176.6 F cm −3 . 20 On the other hand, the low conductivity of metal oxides inhibits their resultant capacitance and energy density. Of late, emerging two-dimensional (2D) metal carbide MXenes (Ti 3 C 2 T x , T is O, –OH, and –F) demonstrate excellent prospects in the electrochemical field because of their high electrical conductivity (over 10 000 S cm −1 ) and remarkable volumetric capacitance (over 1500 F cm −3 ).…”