Synthesis of nitrogen-doped graphene by pyrolysis of ionic-liquid-functionalized graphene

Liu, Jen Yu; Chang, Hsin Yun; Truong, Quang Duc; Ling, Yong

doi:10.1039/c3tc00191a

Cited by 49 publications

(24 citation statements)

References 20 publications

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“…By using a Gaussian fitting method, the N 1s spectrum can be curved-fitted into three types of peaks with binding energy of 398.5 ± 0.3, 400.5 ± 0.3, and 401.6 ± 0.2 eV, associated with pyridinic N (N-6), pyrrolic N (N-5), and graphitic N (N-Q), respectively. [36][37][38] Existing studies reveal that nitrogen-doping can contribute some pseudocapacitance through a redox that pyridinic-N, oxidized pyridinic-N, and pyrrolic-N can be mutually converted during the electrochemical process. Meanwhile, nitrogen-doping can also improve electrical conductivity and nitrogen can be removed by KOH to form mesopores in the 3D bulk of GAs during the activation process.…”

Section: Resultsmentioning

confidence: 99%

Activated-Nitrogen-Doped Graphene-Based Aerogel Composites as Cathode Materials for High Energy Density Lithium-Ion Supercapacitor

Fan

Yang

Meng

et al. 2016

J. Electrochem. Soc.

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Lithium-ion supercapacitor (LIC) was fabricated with nanosheet Li 4 Ti 5 O 12 (LTO) as the negative electrode and activated-nitrogendoped graphene-based aerogel composites (a-NGA) as the positive electrode. The structure, morphology, and pore-size distribution of a-NGA was characterized by SEM, TEM, XRD, TGA, XPS, and nitrogen adsorption-desorption method. Electrochemical properties of a-NGA and nanosheet LTO were studied by galvanostatic charge and discharge test. The results indicated that KOH activation effectively modified the porous structure of NGA and improved its specific surface area to achieve better porosity, thereby enhancing the electrochemical properties. The assembled LIC provide a maximum energy density of 70 Wh kg −1 with the power density of 200 W kg −1 in a voltage of 1-3 V, and still retained an energy density of 21 Wh kg −1 at a high power density of 8000 W kg −1 . More significantly, its exhibits good cycling stability with retention of 64% after 10000 cycles at a high current density of 1.5 A g −1 .With the rapid development of sustainable energy, the demand for high-performance electrochemical energy storage services to make efficient use of energy has significantly increased. 1 Among these various energy storage services, lithium-ion batteries (LIB) and electrical double-layer capacitor (EDLC) have gained more attention in the past decades. 2 LIB has high energy density as high as 150-200 Wh kg −1 , and wide-voltage window; however, its power density is relatively low and its cycle life is poor compared with that of EDLC, EDLC exhibits superior power density up to 10 kW kg −1 , fast charge/discharge rates, and long cycle life. 3-5 However, the low energy density of EDLC limits its application. 3 To meet the increasing demand of high energy density, excellent power capability, and long cycle life, a novel hybrid energy storage service, lithium-ion hybrid supercapacitor (LIC), has emerged in 2001 by Amatucci. 6 Briefly, LIC is fabricated from LIB's insertion type materials and EDLC's materials as the negative electrode and positive electrode, respectively. In the charge/discharge process, anode electrode undergoes Li + insertion/desertion reaction and formation of anion double layer at the cathode electrode. By combining two different storage mechanisms of LIB and supercapacitors, the resulting LIC has a higher power density than the LIB and higher energy density than the EDLC and long cycle life. 3,4,7 In general, electrode materials for the electrochemical performance of LIC plays a vital role. 8 In recent years, various electrode materials of LIC that include cathode electrode and anode electrode have been widely published. Since 2001, Amatucci et al. 6 first assembled LIC with activated carbon (AC) as cathode and Li 4 Ti 5 O 12 (LTO) as anode in a non-aqueous electrolyte, in which energy density exceeds 10 Wh kg −1 . Subsequently, amounts of LIC with various electrode materials assembled are reported. Examples of anode electrode materials include LiCrTiO 4 , 9 α-Fe 2 O 3 , 10 prelithiat...

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Section: Resultsmentioning

confidence: 99%

Activated-Nitrogen-Doped Graphene-Based Aerogel Composites as Cathode Materials for High Energy Density Lithium-Ion Supercapacitor

Fan

Yang

Meng

et al. 2016

J. Electrochem. Soc.

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“…163,164 As one of the most attractive techniques for larger scale and low-cost production of rGO, new methods have been developed to reduce GO that has been homogeneously exfoliated in ILs. [165][166][167]176,177 For example, Yoon et al, developed a facile and scalable method to rapidly produce rGO by IL-assisted microwave chemistry (Fig. 11).…”

Section: Ils For Synthesizing Reduced Graphene Oxides (Rgos) and Exfomentioning

confidence: 99%

Ionic liquids for energy, materials, and medicine

et al. 2014

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As highlighted by the recent ChemComm web themed issue on ionic liquids, this field continues to develop beyond the concept of interesting new solvents for application in the greening of the chemical industry. Here some current research trends in the field will be discussed which show that ionic liquids research is still aimed squarely at solving major societal issues by taking advantage of new fundamental understanding of the nature of these salts in their low temperature liquid state. This article discusses current research trends in applications of ionic liquids to energy, materials, and medicines to provide some insight into the directions, motivations, challenges, and successes being achieved with ionic liquids today.

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“…In this work, we aim to go one step further and use ILs simultaneously as both solvents and reagents for the functionalization of GO through laser-induced chemical routes. To the best of our knowledge, this concept has yet to be addressed since IL doping of GO has hitherto been done through usual chemical routes [33][34][35]. We have chosen two imidazoliumbased ILs with different anions, 1-butyl-3-methylimidazolium chloride ([bmim]Cl) and 1-butyl-3-methylimidazolium acetate ([bmim]Ac).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of graphene-based photocatalysts for water splitting by laser-induced doping with ionic liquids

Pino

González‐Campo

Giraldo

et al. 2018

Carbon

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Synthesis of nitrogen-doped graphene by pyrolysis of ionic-liquid-functionalized graphene

Cited by 49 publications

References 20 publications

Activated-Nitrogen-Doped Graphene-Based Aerogel Composites as Cathode Materials for High Energy Density Lithium-Ion Supercapacitor

Activated-Nitrogen-Doped Graphene-Based Aerogel Composites as Cathode Materials for High Energy Density Lithium-Ion Supercapacitor

Ionic liquids for energy, materials, and medicine

Synthesis of graphene-based photocatalysts for water splitting by laser-induced doping with ionic liquids

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