Three-Dimensional Porous Nitrogen doped Graphene Hydrogel for High Energy Density supercapacitors

Liu, Dan; Fu, Chaopeng; Zhang, Ningshuang; Zhou, Haihui; Kuang, Yafei

doi:10.1016/j.electacta.2016.07.131

Cited by 86 publications

(35 citation statements)

References 65 publications

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“…By calculating from the GCD curves (Figure c) of as‐fabricated devices at different current densities from 1 to 8 A/g, the ASCs deliver a capacitance of 58.1 F/g at the current density of 1 A/g, which contributes to achieving a maximum energy density up to 98.75 W h/kg at a power density of 1 750 W/kg (Figure e). As shown in Figure e, these CDs/G//P−Fe 2 O 3 /G ASCs with such superior energy storage performance outperform commercial lithium ion batteries and SCs, aqueous SCs, as well as most previously reported IL‐based SCs (Table S1), and other metal oxides, graphene based supercapacitors …”

Section: Resultssupporting

confidence: 60%

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

et al. 2018

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Energy‐dense supercapacitors (SCs) based on metal oxides@graphene electrode and ionic liquid (IL) electrolyte hold great promise in sustainable energy system. However, these types of SCs suffer from poor cycling stability, especially at high working voltage. Herein, a porous ferric oxide/graphene (P−Fe2O3/G) electrode has been developed, in which Fe2O3 nanoparticles exhibit abundant and suitable mesoporous channels. This structure ensures the high ionic diffusion kinetics of the IL ions during the repeated charging‐discharging processes, thereby providing the P−Fe2O3/G electrode with outastanding capacitance behavior and cycling performance in IL electrolyte. As a result, an ingenious asymmetric electrode concept has been put forward to fabricate energy‐dense SCs based on this P−Fe2O3/G as negative electrode, carbon dodecahedrons/graphene (CDs/G) as positive electrode and IL electrolyte. Remarkably, the fabricated devices exhibit superior high‐voltage cycling stability with 95 % retention after 20 000 cycles, which are much better than that of most previously reported SCs based on metal oxides/graphene electrode and IL electrolyte. On this basis, a sustainable energy system combining wind harvesting with asymmetric SCs has been established, wherein the asymmetric SCs can be effectively recharged by harvesting sustainable wind power and repeatedly supply power without decline of electrochemical performance. Therefore, this work can provide a promising porous electrode for high performance SCs in sustainable energy system.

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Section: Resultssupporting

confidence: 60%

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

et al. 2018

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“…One wide band at around 1590 cm −1 (G band) is caused by the first order scattering vibration of sp 2 hybridized carbon atoms. [40,41] These results indicate the effective transfer of LIG from PI sheets to silicone. X-ray diffraction (XRD) pattern also confirms that the samples are graphene by observing two broad peaks centered at 24.8°, 43.1° corresponding to (002) and (101) plane of graphene, respectively ( Figure S2, Supporting Information).…”

Section: Doi: 101002/smll201702249mentioning

confidence: 64%

“…As shown in Figure 2c, N 1s spectra is fitted into four main peaks which are assigned to pyridinic N (398.3 eV), pyrrolic N (399.6 eV), graphitic N (401.2 eV), and N in nitrate (406.8 eV). [41] These XPS results indicate that the nitrogen atom was successfully doped in the carbon matrix, resulting in more active sites and thus providing better pseudocapacitive behavior than the common LIG devices (Figure 2c). N doping facilitates absorbing PEDOT and stabilizing the linkage between LIG and PEDOT through hydrophilic group.…”

Section: Doi: 101002/smll201702249mentioning

confidence: 86%

Flexible, Stretchable, and Transparent Planar Microsupercapacitors Based on 3D Porous Laser‐Induced Graphene

Song

Zhu

Gan

et al. 2017

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The demand of flexible energy storage devices for portable and wearable electronics has become increasingly urgent due to the rapid development of microelectronic products, wearable devices, and smart skin. [1][2][3][4][5][6] Some of the most effective and practical technologies for electrochemical energy conversion and storage are batteries, fuel cells, and supercapacitors. [7][8][9][10][11][12][13][14][15] Among them, supercapacitors (SCs) have attracted intensive attentions due to their high power density and long lifecycle. [9,13,[16][17][18] The energy storage is performed by ion adsorption or fast surface redox reaction at the interface between electrodes and electrolyte. Moreover, all-solid-state microsupercapacitors (MSCs) can greatly facilitate the development The graphene with 3D porous network structure is directly laser-induced on polyimide sheets at room temperature in ambient environment by an inexpensive and one-step method, then transferred to silicon rubber substrate to obtain highly stretchable, transparent, and flexible electrode of the all-solidstate planar microsupercapacitors. The electrochemical capacitance properties of the graphene electrodes are further enhanced by nitrogen doping and with conductive poly(3,4-ethylenedioxythiophene) coating. With excellent flexibility, stretchability, and capacitance properties, the planar microsupercapacitors present a great potential in fashionable and comfortable designs for wearable electronics.

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“…However, the two‐dimensional graphene sheets could restack during the preparation and application processes of the electrocatalysts, resulting in the reduction of the electroactive sites . Compared with traditional reduced graphene oxide, graphene hydrogels can provide larger specific surface areas, higher electrical conductivity, lower mass density, and better electron transport channels …”

Section: Introductionmentioning

confidence: 99%

An Electrocatalyst for a Hydrogen Evolution Reaction in an Alkaline Medium: Three‐Dimensional Graphene Supported CeO₂ Hollow Microspheres

Liu

Shen

et al. 2018

Eur J Inorg Chem

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Transition metal oxides (TMO) are promising candidates for low-cost and high-efficiency catalysts for the hydrogen evolution reaction (HER). However, the low conductivity and severe agglomeration of catalyst particles hinder their practical application. Herein, we report an effective HER electrocatalyst of 3D-rGO-CeO 2 with three-dimensional reduced graphene oxide (3D-rGO) decorated with CeO 2 hollow microspheres through a hydrothermal self-assembly approach. It is shown that the CeO 2 hollow microspheres with an average size of ca. 680 nm are uniformly encapsulated within the porous structure of 3D-rGO. Compared with bare CeO 2 hollow micro- [a]

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Three-Dimensional Porous Nitrogen doped Graphene Hydrogel for High Energy Density supercapacitors

Cited by 86 publications

References 65 publications

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

Flexible, Stretchable, and Transparent Planar Microsupercapacitors Based on 3D Porous Laser‐Induced Graphene

An Electrocatalyst for a Hydrogen Evolution Reaction in an Alkaline Medium: Three‐Dimensional Graphene Supported CeO₂ Hollow Microspheres

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Three-Dimensional Porous Nitrogen doped Graphene Hydrogel for High Energy Density supercapacitors

Cited by 86 publications

References 65 publications

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe2O3@Graphene Electrode in Ionic Liquid Electrolyte

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe2O3@Graphene Electrode in Ionic Liquid Electrolyte

Flexible, Stretchable, and Transparent Planar Microsupercapacitors Based on 3D Porous Laser‐Induced Graphene

An Electrocatalyst for a Hydrogen Evolution Reaction in an Alkaline Medium: Three‐Dimensional Graphene Supported CeO2 Hollow Microspheres

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Product

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Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

Sustainable Energy System Utilizing High‐Voltage‐Stable and Energy‐dense Supercapacitors Based on Porous Fe₂O₃@Graphene Electrode in Ionic Liquid Electrolyte

An Electrocatalyst for a Hydrogen Evolution Reaction in an Alkaline Medium: Three‐Dimensional Graphene Supported CeO₂ Hollow Microspheres