Purified nitrogen-doped reduced graphene oxide hydrogels for high-performance supercapacitors

Gao, Xiangli; Han, Gaoyi; Song, Hua; Chang, Yunzhen; Xiao, Yaoming; Zhang, Ying; Liu, Cuixian; Li, Honggang

doi:10.1016/j.jelechem.2019.01.004

Cited by 24 publications

(7 citation statements)

References 52 publications

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“…The materials with a more conjugated structure and less oxygen-containing groups will exhibit high conductivity and vice versa. 15 The N 2 adsorption/desorption isotherms for the rGOF and C-rGOF12-Tx show type IV hysteresis behavior ( Figure S6A). The reason may be that the high OA concentration will induce the aggregation of GO sheets, which will cause the insufficient reduction of GO due to the thick accumulations.…”

Section: Characterization Of the Samplesmentioning

confidence: 99%

“…It is clear that C-rGOF12-T160 has the largest conductivity, which confirms that the conjugated structure well restored in it, 46 and the high conductivity can strengthen the responsiveness of the electrode material to high scan rate or current density, further to ensure an excellent rate capability. 15 The N 2 adsorption/desorption isotherms for the rGOF and C-rGOF12-Tx show type IV hysteresis behavior ( Figure S6A). For C-rGOF12-T140, C-rGOF12-T150, C-rGOF12-T160, and C-rGOF12-T170, the BET SSA are about 163.6, 191.6, 227.9, and 144 m 2 g −1 , and the total pore volumes are about 0.15, 0.25, 0.40, and 0.14, but 141.75 m 2 g −1 and 0.04 cm 3 g −1 for the samples of rGOF.…”

Section: Figurementioning

confidence: 99%

“…[8][9][10][11][12] It is worth noting that graphene has attracted a research Xiangli Gao and Wenhui Ma have the same contribution. 6,15 Rationally designing and precisely controlling the structures of carbon-based materials is the effective route to obtain the electrode materials with novel functions and extraordinary properties. 13,14 It is proved that the composition and microstructure of the electrode materials have decisive influence on the capacitive performances of EDLCs.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 It is proved that the composition and microstructure of the electrode materials have decisive influence on the capacitive performances of EDLCs. 6,15 Rationally designing and precisely controlling the structures of carbon-based materials is the effective route to obtain the electrode materials with novel functions and extraordinary properties. [16][17][18] Up to date, template method has drawn considerable attention to control the structure of the carbonaceous materials.…”

Section: Introductionmentioning

confidence: 99%

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The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

Gao

Han

et al. 2019

Int J Energy Res

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Summary By using oxalic acid (OA) as template and reducer, a novel approach is developed to prepare reduced graphene oxide films with capsular pores (C‐rGOFs) under a hydrothermal condition. The effect of preparation conditions including concentrations of OA and reaction temperatures on the films' structure and capacitive performances has been systematically investigated. The optimal C‐rGOF shows uniform capsule‐like morphology and exhibits a density of 1.18 g cm−3. Tested by using a two‐electrode system, the optimal film shows gravimetric specific capacitance of about 234.9 F g−1 and volumetric specific capacitance of 277.2 F cm−3. Additionally, the optimal film which shows good rate capability can retain 63.9% of initial capacitance at high scan rate of 1.0 V s−1, which is much higher than that of the controlling reduced graphene oxide film (rGOF, 180.5 F g−1, 373.6 F cm−3 and retain only 45.0% of its initial capacitance at 1.0 V s−1). The cells assembled by the optimal C‐rGOF exhibit maximum energy density of 7.5 Wh kg−1, power density of 16.9 kW kg−1, and excellent cycling stability with 91.2% capacitance retention after 21 000 cycles. It is believed that this method can be developed as a useful strategy to prepare rGO‐based materials for energy storage applications.

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Section: Characterization Of the Samplesmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

Gao

Han

et al. 2019

Int J Energy Res

Self Cite

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“…Liu et al (2016) used ammonium bicarbonate to prepared porous N-doped graphene hydrogel, and the hydrogel with high N content (10.8 at%) showed a high specific capacitance of 194.4 F/g. Gao et al (2019) synthetized nitrogen-doped graphene-based hydrogels with concentrated sulfuric acid and o-phenylenediamine (oPDA), and the optimal hydrogel showed specific capacitance about 519.8 F/g.…”

Section: Graphene-based Composite Hydrogel Electrode Materialsmentioning

confidence: 99%

Three-Dimensional Graphene-Based Composite Hydrogel Materials for Flexible Supercapacitor Electrodes

et al. 2019

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Three-dimensional (3D) graphene-based hydrogels have attracted great interest for applying in supercapcacitors electrodes, owing to their intriguing properties that combine the structural interconnectivities and the outstanding properties of graphene. However, the pristine graphene hydrogel can not satisfy the high-performance demands, especial in high specific capacitance. Consequently, novel graphene-based composite hydrogels with increased electrochemical properties have been developed. In this mini review, a brief summary of recent progress in the research of the three-dimensional graphene-based composite hydrogel for flexible supercapacitors electrodes materials is presented. The latest progress in the graphene-based composite hydrogel consisting of graphene/metal, graphene/polymer, and atoms doped graphene is discussed. Furthermore, future perspectives and challenges in graphene-based composite hydrogel for supercapacitor electrodes are also expressed.

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Intercalation Engineering of 2D Materials at Macroscale for Smart Human–Machine Interface and Double‐Layer to Faradaic Charge Storage for Ions Separation

Patil

Dutta

2023

Adv Materials Inter

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2D materials have attracted considerable attention in the past decade for their superlative physical properties. Lightweight foam from 2D materials can reduce the use of raw materials, save energy in processing the material and downregulate the carbon emission. Self‐assembling of graphene nanosheets results in 3D porous lightweight foam resembling hydrogels, aerogels, and xerogels. Hierarchical graphene architecture provides an uninterrupted path to electrons and phonon transport conforms to eligibility for developing sensor, energy storage, and energy conversion devices. Artificial intelligence (AI) originates from human–machine interaction and physiological signal reception which requires a large sensing range that illustrates to healthcare surveillance with wearable devices. Spongy architectures with flexibility and reversible compressibility act as a good candidate for pressure sensing for a wide range of real‐time human health monitoring systems by using artificial intelligence. In this review, the new perspective of emerging 2D materials (such as MXene, and borophene) along with the investigation of the graphene foam structure is demonstrated. Electrosorption of salt‐ions under foam electrode are reviewed in the context of electrochemical stability recycling ability, and efficiency of adsorption‐desorption. Beyond these, remaining challenges are depicted for emerging 2D‐materials of interest for health monitoring sensors and flexible supercapacitors for promising research directions.

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Purified nitrogen-doped reduced graphene oxide hydrogels for high-performance supercapacitors

Cited by 24 publications

References 52 publications

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

The electrochemical properties of reduced graphene oxide film with capsular pores prepared by using oxalic acid as template

Three-Dimensional Graphene-Based Composite Hydrogel Materials for Flexible Supercapacitor Electrodes

Intercalation Engineering of 2D Materials at Macroscale for Smart Human–Machine Interface and Double‐Layer to Faradaic Charge Storage for Ions Separation

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