“…Such layered structure as shown in Fig. 2e indicates that a layer of the s-PANINa surrounded by q-graphene sheets [26] and could effect to conductivity and stabilize the structure of nanohybrid during the charge-discharge process, which might lead to improve the capacitance and longer cycling life [26].…”
Section: Resultsmentioning
confidence: 99%
“…The high cyclic stability and excellent coulombic efficiency of the proposed electrode material can be ascribed to the negligible degradation of electrode matrix during charge/discharge process. Performance comparison of different graphene/PANI nanostructure-based electrodes for supercapacitor application [18,26,46,50,51] versus our proposed electrode material is given in Table 2. As can be seen, capacitance and long-term stability of the proposed electrode material is superior or at least comparable to those recently obtained by other works.…”
Section: Cycling Stability Of the Electrode Materialsmentioning
A new hybrid sulfonated polyaniline/quaternized graphene (s-PANINa/q-graphene) is prepared by electrostatic and p-p interactions between positively charged quaternized graphene (q-graphene) and negatively charged sulfonated polyaniline (s-PANINa). The introduction of the s-PANINa into the q-graphene sheets leads to the formation of nanohybrid with layered morphology and high electrical conductivity. The electrochemical performance of s-PANINa/q-graphene nanohybrid as an electrode material for supercapacitors application is evaluated using cyclic voltammetry and galvanostatic charge/discharge tests in 1.0 M of H 2 SO 4 as an electrolyte. The maximum capacitance of 682 F g -1 is obtained for s-PANINa/qgraphene nanohybrid at the current density of 1.0 A g -1 . 70.0% retention of the initial specific capacitance (from current density of 1.0-30 A g -1 ), which indicates the excellent rate capability and consequently high power characteristics of s-PANINa/q-graphene nanohybrid. Moreover, the proposed nanohybrid shows an excellent stability (less than 5% drop after 2000 cycles) with about 100% of coulombic efficiency. The improved electrochemical performance because of the synergistic effects between q-graphene and the s-PANINa indicates that nanohybrid is a good candidate for high-performance supercapacitors.
“…Such layered structure as shown in Fig. 2e indicates that a layer of the s-PANINa surrounded by q-graphene sheets [26] and could effect to conductivity and stabilize the structure of nanohybrid during the charge-discharge process, which might lead to improve the capacitance and longer cycling life [26].…”
Section: Resultsmentioning
confidence: 99%
“…The high cyclic stability and excellent coulombic efficiency of the proposed electrode material can be ascribed to the negligible degradation of electrode matrix during charge/discharge process. Performance comparison of different graphene/PANI nanostructure-based electrodes for supercapacitor application [18,26,46,50,51] versus our proposed electrode material is given in Table 2. As can be seen, capacitance and long-term stability of the proposed electrode material is superior or at least comparable to those recently obtained by other works.…”
Section: Cycling Stability Of the Electrode Materialsmentioning
A new hybrid sulfonated polyaniline/quaternized graphene (s-PANINa/q-graphene) is prepared by electrostatic and p-p interactions between positively charged quaternized graphene (q-graphene) and negatively charged sulfonated polyaniline (s-PANINa). The introduction of the s-PANINa into the q-graphene sheets leads to the formation of nanohybrid with layered morphology and high electrical conductivity. The electrochemical performance of s-PANINa/q-graphene nanohybrid as an electrode material for supercapacitors application is evaluated using cyclic voltammetry and galvanostatic charge/discharge tests in 1.0 M of H 2 SO 4 as an electrolyte. The maximum capacitance of 682 F g -1 is obtained for s-PANINa/qgraphene nanohybrid at the current density of 1.0 A g -1 . 70.0% retention of the initial specific capacitance (from current density of 1.0-30 A g -1 ), which indicates the excellent rate capability and consequently high power characteristics of s-PANINa/q-graphene nanohybrid. Moreover, the proposed nanohybrid shows an excellent stability (less than 5% drop after 2000 cycles) with about 100% of coulombic efficiency. The improved electrochemical performance because of the synergistic effects between q-graphene and the s-PANINa indicates that nanohybrid is a good candidate for high-performance supercapacitors.
“…For rGO supercapacitors, the appearance of humps in the CV profile indicated the combination of both double-layer capacitive from graphene and pseudocapacitive behavior from the oxidation/reduction reactions of the oxygen-containing functional groups. However, there had an obvious distortion from rectangular shape when the scan rate increased to 50 mV s −1 in the rGO electrode [ 30 ]. Figure 8 The CV curves of GNS (a) and charge/discharges of GNS (b) .…”
We reported a simple and effective way of fabricating one-dimensional (1D) graphene oxide nanoscrolls (GONS) from graphene oxide (GO) sheets through shock cooling by liquid nitrogen. The corresponding mechanism of rolling was proposed. One possibility is the formation of ice crystals during the shock cooling process in liquid nitrogen to be the driving force. The other might be due to the uneven stress of the sheets inside or outside ice during the lyophilization. After reducing, graphene nanoscrolls (GNS) exhibited good structural stability, high specific surface area, and high specific capacitance. The capacitance properties were investigated by cyclic voltammetry, galvanostatic charge-discharge, and electrical impedance spectroscopy. A specific capacity of 156 F/g for the GNS at the current density of 1.0 A/g was obtained comparing with the specific capacity of 108 F/g for graphene sheets. Those results indicated that GNS-based rolling structure could be a kind of promising electrode material for supercapacitors and batteries.
“…For rGO supercapacitors, the appearance of humps in the CV profile indicated the combination of both double-layer capacitive from graphene and pseudocapacitive behavior from the oxidation/reduction reactions of the oxygen-containing functional groups. However, there had an obvious distortion from rectangular shape when the scan rate increased to 50 mV s −1 in the rGO electrode [30]. Figure 8b demonstrates the charge/discharge of GNS, the curve of the GNS at different current densities of 0.5 to 4.0 A/g maintained almost the same shape in the potential range from 0 to 1.0 V, which indicated its sustainable behavior in a broad current range.…”
Section: Characteristic Of Capacitance Propertiesmentioning
We reported a simple and effective way of fabricating one-dimensional (1D) graphene oxide nanoscrolls (GONS) from graphene oxide (GO) sheets through shock cooling by liquid nitrogen. The corresponding mechanism of rolling was proposed. One possibility is the formation of ice crystals during the shock cooling process in liquid nitrogen to be the driving force. The other might be due to the uneven stress of the sheets inside or outside ice during the lyophilization. After reducing, graphene nanoscrolls (GNS) exhibited good structural stability, high specific surface area, and high specific capacitance. The capacitance properties were investigated by cyclic voltammetry, galvanostatic charge-discharge, and electrical impedance spectroscopy. A specific capacity of 156 F/g for the GNS at the current density of 1.0 A/g was obtained comparing with the specific capacity of 108 F/g for graphene sheets. Those results indicated that GNS-based rolling structure could be a kind of promising electrode material for supercapacitors and batteries.
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