Graphene-like porous carbon nanosheets derived from salvia splendens for high-rate performance supercapacitors

Liu, Bei; Yang, Mei; Chen, Hongbiao; Liu, Yijiang; Yang, Dong

doi:10.1016/j.jpowsour.2018.06.100

Cited by 201 publications

(70 citation statements)

References 49 publications

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“…[159] The effective capacitance value can be increased by compositing it with highly conductive carbon-based porousm aterials. [161] The authorsr eported the direct deposition of MnO 2 nanostructures onto the surface of biomass-derived GPCNs (GPCN-SS) throughahydrothermal reaction. [160] In ar ecent study, Liu et al demonstratedan ovel ASC composed of MnO 2 nanostructures and biomass Salvia splendens (SS)-based GPCNs, which was prepared through the pyrolysis of NaCl crystal sealed SS petals at 800 8Cfor 2hunder anitrogen atmosphere, followed by washing andd rying.…”

Section: Salvia Splendensmentioning

confidence: 99%

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

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Section: Salvia Splendensmentioning

confidence: 99%

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

et al. 2019

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“…As shown in the inset in Figure 7, the SCs fabricated in this study were analyzed to have three major impedance components: bulk electrolyte resistance (R b ), charge transfer resistance (R ct ), [52,53] which varies according to the AC pore structure and texture, coupled with the constant phase element (CPE), and Warburg resistance (Z w ) for diffusion impedance in the pores of AC. [54,55] bPEG-15 and cICE + bPEG showed a larger R b than LE and cICE-03 due to their PPEGMA in the bulk electrolyte. The SCs with PICEMA, cICE-03 and cICE + bPEG, were found to have a larger R ct than the other SCs and this result has a close correspondence with the design concept of PICEMA that was impregnated in the AC electrode to suppress electrolytic decomposition (Figure 4d).…”

Section: Impedance Analyses Before and After Cycling At 20 And 80°cmentioning

confidence: 92%

Selective Effect of Gel Polymer Electrolytes on Suppressing Decomposition and Evaporation of Electrolyte in Acetonitrile‐Based Supercapacitors at Elevated Temperature

et al. 2019

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Acetonitrile‐based liquid electrolytes have been used in supercapacitors due to their high ionic conductivity, but they have drawbacks when operated at elevated temperature. The electrochemical performances of acetonitrile‐based activated carbon (AC) supercapacitors are improved by two gel polymer electrolytes (GPEs) functionalized in a bulk electrolyte and at the AC interface. A GPE with poly(ethylene glycol) suppresses the evaporation of acetonitrile at the bulk electrolyte during resting and cycling at 80 °C effectively. A GPE with an isocyanate group obtained by curing after impregnated into AC has an exceptional effect on suppressing the anodic decomposition of the liquid electrolyte even at elevated temperature. This parallel effect is verified through investigations of electrolytic decomposition at specific potentials of positive and negative electrodes, cycling stability of the assembled supercapacitors at 3.0 V, and change in the impedance parameters during cycling. In addition, a mechanism for the stabilization of electrolyte by an isocyanate is suggested.

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“…At the same time, it is worth noting that CNF-5 samples shows better rate capability (75 %). [46][47][48][49][50][51] To demonstrate the stability of the CNF-5 device, 10,000 consecutive charge-discharge processes were performed at a current density of 4 A g À 1 (Figure 6e). More importantly, the previously reported carbon-based supercapacitors have lower energy densities than the CNF-5//CNF-5 symmetric supercapacitors.…”

Section: Two-electrode Configurationmentioning

confidence: 99%

“…More importantly, the previously reported carbon-based supercapacitors have lower energy densities than the CNF-5//CNF-5 symmetric supercapacitors. [46][47][48][49][50][51] To demonstrate the stability of the CNF-5 device, 10,000 consecutive charge-discharge processes were performed at a current density of 4 A g À 1 (Figure 6e). It can be seen from the GCD curve before and after the cycle that the CNF-5 device has better cycle stability.…”

Section: Two-electrode Configurationmentioning

confidence: 99%

Tuning Nitrogen Species in Two‐Dimensional Carbon through Pore Structure Change for High Supercapacitor Performance

et al. 2019

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Carbonaceous materials have long been a key component of supercapacitor energy storage systems, and exploring nitrogen atom doping and its role is currently the focus of carbon-based electrode development. However, achieving a high proportion of pyridinic N (active N) in N-doped carbon is still a big challenge. Here, by introducing a triblock copolymer F127 into the phenolic resin, the pore structure of the two-dimensional carbon material is successfully adjusted, thereby increasing the probability of generation of active nitrogen. We found that this two-dimensional porous structure is beneficial to the formation of pyridinic N. Through the change of pore structure, the ratio of pyridinic N to the total N was further increased by 13.9 %.Therefore, it provides a large specific capacitance (220 F g À 1 ), excellent cycle stability (93.6 %) and high rate performance (71.2 %) in the alkaline KOH electrolyte. To further increase the energy density, we constructed an symmetrical supercapacitor device using an ionic liquid electrolyte (equal amount of 1ethyl-3-methylimidazolium tetrafluoroborate and acetonitrile). As a result, since the electrolyte has a voltage window of up to 3 V, the energy density is as high as 37.5 Wh kg À 1 . This superior performance indicates that adjusting the ratio of pyridinic N provides a promising method for preparing excellent N-doped carbon materials for energy storage systems.

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Graphene-like porous carbon nanosheets derived from salvia splendens for high-rate performance supercapacitors

Cited by 201 publications

References 49 publications

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

Biomass‐Derived Carbon: A Value‐Added Journey Towards Constructing High‐Energy Supercapacitors in an Asymmetric Fashion

Selective Effect of Gel Polymer Electrolytes on Suppressing Decomposition and Evaporation of Electrolyte in Acetonitrile‐Based Supercapacitors at Elevated Temperature

Tuning Nitrogen Species in Two‐Dimensional Carbon through Pore Structure Change for High Supercapacitor Performance

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