N-doped structures and surface functional groups of reduced graphene oxide and their effect on the electrochemical performance of supercapacitor with organic electrolyte

Li, Shin-Ming; Yang, Shao-Ming; Wang, Yusheng; Tsai, Hsiu-Ping; Tien, Hsi-Wen; Hsiao, Sheng-Tsung; Liao, Wei-Hao; Chang, Chien-Liang; Chen‐Chi, M.; Hu, Chi‐Chang

doi:10.1016/j.jpowsour.2014.12.025

Cited by 135 publications

(40 citation statements)

References 39 publications

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“…But the results were quiet opposite the conductivity increases and the capacitance decreases by increasing EG in the network. This may be due to the partial agglomeration of graphene sheet or the thickness which may alter the conductivity and effect the capacitance of our prepared EDLCs [40][41][42][43].…”

Section: Resultsmentioning

confidence: 99%

Preparation of highly expanded graphene with large surface area and its additional conductive effect for EDLC performance

Ullah

Kim

Yang

et al. 2015

J Mater Sci: Mater Electron

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Expanded graphene (EG) has been produced using fast oxidation/intercalation process. The as prepared EG were then used as conductive additive to study the electrochemical properties of activated carbon based electric double layered supercapacitors (EDLCs). The physiochemical properties of EG were studied using scanning electron microscopy, Raman spectroscopic techniques, atomic force microscopy and energy dispersive X-ray analysis. The electrochemical properties were studied using charge/discharge cyclic voltammetry and electrochemical impedance spectroscopy. All the electrochemical tests were carried out in 1 M, TEA BF 4 in acetonitrile as a suitable electrolyte for our AC based supercapacitors. Electrochemical test reveals that EG greatly affect the conductivity of the ions through the AC/EG interface. The specific capacitance remains the same for smaller values of EG in the composites electrodes. These results also evident the optimum loading of graphene in the future graphene based EDLCs.

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Section: Resultsmentioning

confidence: 99%

Preparation of highly expanded graphene with large surface area and its additional conductive effect for EDLC performance

Ullah

Kim

Yang

et al. 2015

J Mater Sci: Mater Electron

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“…[85] Meanwhile, the surface wettability and capacitance were improved by the pyridinic-N and pyrrolic-N configurations. [86] Therefore, it exhibited a considerable specific capacitance, excellent rate capability, and long cyclic stability when using the high N-doped 2D graphene as the supercapacitor materials. In order to improve the electrochemical performance of graphene-based supercapacitors, the physical and chemical activation of graphene oxide or reduced graphene oxide has been demonstrated to be effective methods.…”

Section: Wwwadvsustainsyscommentioning

confidence: 99%

Progress of Nanostructured Electrode Materials for Supercapacitors

Jiang

Yadi

Nie

et al. 2017

Advanced Sustainable Systems

111

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Supercapacitors, as a type of energy storage system, bridge the power/energy gap between conventional capacitors and batteries due to attractive properties such as high power density, long cycle lifespan, and large temperature range. However, the low energy density of supercapacitors compared to lithium‐ion batteries has hindered their general application. In general, the electrochemical performance of supercapacitors is closely related to the structure of their electrode materials, electrolytes, and device design. The main materials used in electrochemical double‐layer capacitors (EDLCs) are carbon materials with various architectures. This is due to their high surface area, good electric conductivity, and intrinsic stability. In this review, recently reported carbon‐based nanostructured electrode materials with 0D, 1D, 2D, and 3D structures are systematically reviewed. The effect of nanostructuring on the properties of supercapacitors including specific capacitance, rate capability, and cycle stability is explored, the details of which may serve as a guide to electrode design for the next generation of EDLCs.

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“…Today, explosive thermal exfoliation has been widely used by many research laboratories and industry manufacturers to generate porous exfoliated graphene-based materials for a variety of applications [7, 26–33]. In general, high temperature and/or vacuum are found to be beneficial to overcome the van der Waals forces between individual sheets in GO and promote explosive exfoliation, which in turn has supported the generation of porous structures in the reduced graphite oxide (rGO) product [8, 20, 31, 34–40]. Many factors can affect thermal exfoliation of GO and influence the morphology and surface area of the product rGO.…”

Section: Introductionmentioning

confidence: 99%

“…McAllister et al proposed that fast heating to temperatures above 550°C at ambient pressure yields high rGO surface areas and few-layered solid products, which is achieved through the fast insertion of GO sample into a pre-heated tube furnace. Since then, the process of fast insertion of the GO sample into a pre-heated furnace has been adopted by many other research groups [20, 34–36]. More recently, Yang et al performed a study on the relationship between the thermal reduction parameters - including high vacuum, target decomposition temperature and instrument imposed external heating rate effects (up to 50 K/min) - on the product rGO surface area [24].…”

Section: Introductionmentioning

confidence: 99%

Influence of external heating rate on the structure and porosity of thermally exfoliated graphite oxide

Qiu

Moore

Hurt

et al. 2017

Carbon

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Fast external heating rates in graphite oxide thermal exfoliation have been reported to be advantageous for generating high surface area graphene-based materials for a variety of applications. The study yields the surprising result that the surface area and porosity developed in reduced graphite oxide under some conditions are independent of instrument-set external heating rates. The true “total” heating rate experienced by the sample is shown to be the sum of the external rate and the local self-heating rate associated with the exothermicity of graphite oxide exfoliation, and under many conditions, the local self-heating contribution dominates. In these instances, increasing external heating rate does not increase the total rate, improve exfoliation degree or enhance surface area. These results are important for optimizing the conditions for fabrication of reduced graphene oxide with tailored properties.

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N-doped structures and surface functional groups of reduced graphene oxide and their effect on the electrochemical performance of supercapacitor with organic electrolyte

Cited by 135 publications

References 39 publications

Preparation of highly expanded graphene with large surface area and its additional conductive effect for EDLC performance

Preparation of highly expanded graphene with large surface area and its additional conductive effect for EDLC performance

Progress of Nanostructured Electrode Materials for Supercapacitors

Influence of external heating rate on the structure and porosity of thermally exfoliated graphite oxide

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