Three dimensional reduced graphene hydrogels with tunable pore sizes using thiourea dioxide for electrode materials in supercapacitors

Xing, Ling‐Bao; Zhang, Jingli; Zhang, Juan; Hou, Shifeng; Zhou, Jin; Si, Weijiang; Cui, Hongyou; Zhuo, Shuping

doi:10.1016/j.electacta.2015.07.150

Cited by 31 publications

(12 citation statements)

References 43 publications

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“…As shown in Figure 6a, the CV curves of NGA-1 demonstrated a quasi-rectangular shape with slight distortion at a low scan rate of 20 mV/s, which was induced by the pseudo-capacitance with the presence of N and O-containing functional groups in the graphene aerogel. [25] As shown in Figures 7a, CV curves of all the NGAs exhibited the similar rectangle shape and good symmetry at the scan rate of 5 mV/s, indicating their double-layer capacitor performance. This phenomenon could be further proved by the cyclic voltammograms curves of NGA-2, NGA-3, NGA-4 and NGA-5 as shown in Figures 6c, 6e, 6g and 6i.…”

Section: Electrochemical Propertiesmentioning

confidence: 66%

“…The interior microstructures and morphologies of the obtained NGAs were characterized by SEM and TEM observations. [25] Furthermore, as shown in the low-magnification TEM image (Figure 2a), thin wrinkles and folds revealed that the graphene nanosheets in three-dimensional structure of NGAs were flexible. Compared with the dimensions and shapes, the SEM images of NGAs showed a significant change of their morphology and structure, as seen from Figures 1b-1f.…”

Section: Structure Characterizationsmentioning

confidence: 91%

“…[25] Nitrogen-doped graphene by using various reducing agents such as pyrrole, [26][27][28] dopamine, [29,30] urea, [31,32] thiocarbohydrazide, [33] amino acids, [34] phenylenediamine, [35] N 2 H 4 [36,37] and melamine [38,39] has been widely studied in resent years, which was because incorporating nitrogen atoms into graphene could tailor the electronic structure of graphene and improve its electrochemical performance. [25] Nitrogen-doped graphene by using various reducing agents such as pyrrole, [26][27][28] dopamine, [29,30] urea, [31,32] thiocarbohydrazide, [33] amino acids, [34] phenylenediamine, [35] N 2 H 4 [36,37] and melamine [38,39] has been widely studied in resent years, which was because incorporating nitrogen atoms into graphene could tailor the electronic structure of graphene and improve its electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of Nitrogen‐Doped Graphene Aerogels for Electrode Materials in Supercapacitors

et al. 2017

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Three-dimensional porous nitrogen-doped graphene aerogels (NGAs) were synthesized by using graphene oxide (GO) and chitosan (CS) via a self-assembly process by one-pot hydrothermal method. The morphology and structure of the as-prepared materials were characterized by means of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, XPS spectroscopy, Raman spectroscopy, nitrogen adsorption/desorption measurement and Fourier transform infrared spectroscopy. The electrochemical performance of NGAs was studied by cyclic voltammetry, galvanostatic charge/discharge and impedance spectroscopy measurements. The microstructure, surface area and capacitance of NGAs could be facilely controlled by adding different amounts of chitosan. The prepared NGA-4 showed a specific capacitance of 148.0 F/g at the discharge current density of 0.5 A/g and also retained 95.3% of the initial capacitance after 5000 cycles at the scan rate of 10 mV/s. It provided a possible way to obtain graphene based materials with high surface area and capacitance.

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Section: Electrochemical Propertiesmentioning

confidence: 66%

Section: Structure Characterizationsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of Nitrogen‐Doped Graphene Aerogels for Electrode Materials in Supercapacitors

et al. 2017

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“…The N 1s was determined by 398.5, 400.3 and 401.2 eV, which can be attributed to pyridinic N, pyrrolic N and graphitic N, respectively. 45 In case of O 1s, three peaks at 531.8, 532.7, and 533.6 eV, corresponding to C O (carbonyl), C–O (epoxy and hydroxyl), and O C–O (carboxyl) groups are determined. The XPS results demonstrated the effective doping of nitrogen by chitosan in the preparation process.…”

Section: Resultsmentioning

confidence: 95%

Nitrogen-doped hierarchical porous carbon derived from a chitosan/polyethylene glycol blend for high performance supercapacitors

Pan

et al. 2018

RSC Adv.

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Nitrogen-doped hierarchical porous carbon (NHPC) materials were synthesized by using a chitosan/ polyethylene glycol (PEG) blend as raw material through a facile carbonization-activation process. In this method, chitosan was used as a nitrogen-containing carbon precursor, low cost and large-scale commercial PEG was employed as a porogen. The physical and electrochemical properties of the resultant NHPC were affected by the ratio of chitosan and PEG. The sample obtained by the ratio of 3 : 2 exhibits a high specific surface area (2269 m 2 g À1 ), moderate nitrogen doping (3.22 at%) and optimized pore structure. It exhibits a high specific capacitance of 356 F g À1 in 1 M H 2 SO 4 and 271 F g À1 in 2 M KOH at a current density of 1 A g À1 , and over 230 F g À1 can be still retained at a high current density of 20 A g À1 in both electrolytes. Additionally, the assembled symmetric supercapacitors show an excellent cycling stability with 94% (in 1 M H 2 SO 4 ) and 97% (in 2 M KOH) retention after 10 000 cycles at 1 A g À1 . These results indicate that the chitosan/PEG blend can act as a novel and appropriate precursor to prepare low-cost NHPC materials for high-performance supercapacitors.

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“…1.2 nm, Table S1 †) is even two times larger than that of the desolvated ones. 28 This may lead to a more serious decrease of C m at high current densities owing to the insufficient time of solvent shell removing, 28 ion diffusion and charge arrangement 35,36 during a limited charge/discharge period. For instance, a pistachionutshell-based PCM with a high surface area of 1069 m 2 g À1 and micropore proportion (V mic %) of 83% presented C m of 313 and 215 F g À1 in aqueous and organic electrolyte, respectively.…”

Section: Introductionmentioning

confidence: 99%

Mesopore-dominant wormhole-like carbon with high supercapacitive performance in organic electrolyte

Yang

Zhang

et al. 2017

RSC Adv.

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Three dimensional reduced graphene hydrogels with tunable pore sizes using thiourea dioxide for electrode materials in supercapacitors

Cited by 31 publications

References 43 publications

Facile Synthesis of Nitrogen‐Doped Graphene Aerogels for Electrode Materials in Supercapacitors

Facile Synthesis of Nitrogen‐Doped Graphene Aerogels for Electrode Materials in Supercapacitors

Nitrogen-doped hierarchical porous carbon derived from a chitosan/polyethylene glycol blend for high performance supercapacitors

Mesopore-dominant wormhole-like carbon with high supercapacitive performance in organic electrolyte

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