Synthesis of porous graphene/activated carbon composite with high packing density and large specific surface area for supercapacitor electrode material

Zheng, Chao; Zhou, Xufeng; Cao, Hongliang; Wang, Guohua; Liu, Zhaoping

doi:10.1016/j.jpowsour.2014.01.056

Cited by 363 publications

(166 citation statements)

References 26 publications

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“…As the operating temperature increased from 400 to 800 C, the I D /I G ratio also increased from 1.87 to 1.03. This is attributed to the increased number of defects in the GR during the removal of oxygen at a higher temperature (Zheng et al 2014). This increased number of defects results from the increased ratio of sp 3 carbon.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of 3D Silver-Graphene-Titanium Dioxide Composite via Aerosol Spray Pyrolysis for Sensitive Glucose Biosensor

Jang

Kim

Chang

et al. 2015

Aerosol Science and Technology

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A sensitive glucose biosensor was developed based on the adsorption of glucose oxidase by a three-dimensional silvergraphene-titanium dioxide (3D Ag-GR-TiO 2 ) composite electrode. Aerosol spray pyrolysis was employed to synthesize the 3D Ag-GR-TiO 2 composite using a colloidal mixture of a silver acetate precursor (C 2 H 3 AgO 2 ), graphene oxide, and TiO 2 nanoparticles. The effects of the operating temperature, gas flowrate, and TiO 2 concentration on the particle properties were investigated. The particle morphology of all 3D Ag-GR-TiO 2 composites was spherical in shape. The average sizes of composites could be controlled from 0.45 to 0.64 mm with the variation of process variables. Ag nanoparticles less than 10 nm in diameter were deposited on the surfaces of the TiO 2 nanoparticles and GR after a reduction process. The characteristics of the glucose biosensor fabricated with the asprepared 3D Ag-GR-TiO 2 composite were assessed through cyclic voltammetry measurements. The biosensor exhibited a high current flow as well as clear redox peaks, resulting in a superior ability of the catalyst in terms of the electrochemical reactions. The highest sensitivity of glucose biosensor was obtained by 3D Ag-GR-TiO 2 composite, which was 12.2 mA/ mM¢cm 2 , among 3D Ag-GR-TiO 2 , 3D Ag-GR, and 3D GR-TiO 2 composites.

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Section: Discussionmentioning

confidence: 99%

Synthesis of 3D Silver-Graphene-Titanium Dioxide Composite via Aerosol Spray Pyrolysis for Sensitive Glucose Biosensor

Jang

Kim

Chang

et al. 2015

Aerosol Science and Technology

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“…[163,164] In these assemblies, graphene or rGO act as a flexible bridge to form a ''plane-to-point'' conducting network, whereas the CNTs or activated carbon particles sever as spacers between the graphene layers to prevent them from restacking. Consequently, the resulting materials outperform any individual components that constitute to them.…”

Section: D Graphene Hybrid Electrodesmentioning

confidence: 99%

Carbon Nanomaterials in Different Dimensions for Electrochemical Energy Storage

2016

Advanced Energy Materials

252

109

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In spite of an ongoing advancement, current popular EES systems including Li-ion batteries (LIBs), supercapacitors (SCs), and redox flow cells (RFCs) are limited by severe performance challenges of electrode materials in terms of low energy and power density as well as short durability. To mitigate the issues, carbon nanomaterials could be introduced to these EES systems, taking advantage of their unique geometry, excellent conductivity, large surface area, and intrinsic flexibility. Numerous carbon nanomaterial based EES systems, where carbon nanomaterials are adopted as either conducting additive or active electrode, have been developed and demonstrated appealing energy and power features. With the capability to enhance the structural and electrochemical properties of electrodes, carbon nanomaterials and their derivatives offer a wide range of possibilities to design advanced EES devices that can meet our growing energy and power demands in the future.A number of reviews have been published in the past few years on the application of carbon nanomaterials in EES. [5][6][7][8] However, this area is so active and new works accumulate very quickly. Therefore, it is helpful to update the new designs and outcomes. This progress report will summarize the most exciting recent (from the year 2010 onwards) advances in the application of carbon nanomaterials with different dimensions, i.e., 0D fullerene, 1D CNT, 2D graphene, and 3D assemblies of CNT and graphene, in EES systems, and highlight the new trends in the field. Besides the repetitively reviewed LIBs and SCs, this work will also deal with another important system, the RFC, which has been rejuvenated recently and is becoming increasingly vital for large scale energy storage. The recent EES applications of carbon nanomaterials will be discussed based on their dimensions. Structure and Properties of Various Nanostructured CarbonFullerenes, CNTs, and graphene all present conjugated π electron systems. The unique electronic configuration combined with geometric structure endows them with extraordinary properties, which make them superior to their competitors for specific applications such as EES. 0D FullerenesFullerene normally has a hollow sphere or ellipsoid shape. Specifically, C 60 has a cage-like fused-ring structure (truncated Carbon nanomaterials including fullerenes, carbon nanotubes, graphene, and their assemblies represent a unique type of materials in diverse formats and dimensions. They feature a large surface area, superior conductivity, fast charge transport, and intrinsic stability, which are essentially required for vari ous electrochemical energy storage (EES) systems such as Li-ion batteries, supercapacitors, and redox flow cells. The scaled-up and reliable production and assembly of carbon nanomaterials is a prerequisite for the development of carbon nanomaterial-based EES devices. In this progress report, the preparation of carbon nanostructures and the state-of-the-art applications of carbon nanomaterials with different dimensions in versatile EES...

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“…There have been two general approaches proposed so far to incorporate graphene in AC electrodes. The first one includes mixing graphene oxide with various biomasses as the carbon source and then producing the AC/graphene composites via hydrothermal or normal activation process [3,26,27]. The second method involves synthesizing AC/graphene organogels through thermal reduction of graphene oxide at moderate temperature in an autoclave [22,27].…”

Section: Introductionmentioning

confidence: 99%

Enhanced performance of carbon/carbon supercapacitors upon graphene addition

Zhang

Lum

Pan

2017

Nanotechnol. Environ. Eng.

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Graphene has great potential for application in capacitive energy storage devices. In this study, we have investigated the effects of employing reduced graphene oxide (rGO) either as an additional supplement or as a total replacement of carbon black, the current conductive additive used in commercial carbon/carbon supercapacitors. We also examined the impact of incorporating rGO before and during the slurry preparation. Some electrochemical and morphological studies were conducted to compare the rGO and carbon black in performance enhancement for conventional activated carbon-based electrodes. Our results have demonstrated the benefits of incorporating graphene into the current carbon/carbon supercapacitors.

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Synthesis of porous graphene/activated carbon composite with high packing density and large specific surface area for supercapacitor electrode material

Cited by 363 publications

References 26 publications

Synthesis of 3D Silver-Graphene-Titanium Dioxide Composite via Aerosol Spray Pyrolysis for Sensitive Glucose Biosensor

Synthesis of 3D Silver-Graphene-Titanium Dioxide Composite via Aerosol Spray Pyrolysis for Sensitive Glucose Biosensor

Carbon Nanomaterials in Different Dimensions for Electrochemical Energy Storage

Enhanced performance of carbon/carbon supercapacitors upon graphene addition

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