scholarly journals Interlayer Separation in Graphene Paper Comprising Electrochemically Exfoliated Graphene

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 865
Author(s):  
Dang Du Nguyen ◽  
TaeGyeong Lim ◽  
Soomook Lim ◽  
Ji Won Suk
Keyword(s):  
Energy Storage Devices ◽  
Storage Devices ◽  
Fundamental Properties ◽  
Exfoliated Graphene ◽  
Graphene Flakes ◽  
Fundamental Understanding ◽  
Fracture Tests ◽  
Graphene Paper ◽  
Few Layer Graphene ◽  
Force Displacement

The emergence of graphene paper comprising well-stacked graphene flakes has promoted the application of graphene-based materials in diverse fields such as energy storage devices, membrane desalination, and actuators. The fundamental properties of graphene paper such as mechanical, electrical, and thermal properties are critical to the design and fabrication of paper-based devices. In this study, the interlayer interactions in graphene paper were investigated by double cantilever beam (DCB) fracture tests. Graphene papers fabricated by flow-directed stacking of electrochemically exfoliated few-layer graphene flakes were mechanically separated into two parts, which generated force-displacement responses of the DCB sample. The analysis based on fracture mechanics revealed that the interlayer separation energy of the graphene paper was 9.83 ± 0.06 J/m2. The results provided a fundamental understanding of the interfacial properties of graphene papers, which will be useful for developing paper-based devices with mechanical integrity.

Dielectric environment as a factor to enhance the production yield of solvent exfoliated graphene

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64395-64403 ◽  
Author(s):  
Pawan Kumar Srivastava ◽  
Premlata Yadav ◽  
Subhasis Ghosh
Keyword(s):  
Energy Storage ◽  
Production Yield ◽  
High Yield ◽  
Energy Storage Devices ◽  
High Quality ◽  
Storage Devices ◽  
Exfoliated Graphene ◽  
Yield Production ◽  
High Yield Production ◽  
Dielectric Environment

High yield production of high quality graphene is essential for its application in electronics, optoelectronics and energy storage devices.

Controlled multimodal hierarchically porous electrode self-assembly of electrochemically exfoliated graphene for fully solid-state flexible supercapacitor

2017 ◽  
Vol 19 (45) ◽  
pp. 30381-30392 ◽  
Author(s):  
Nurlia P. Sari ◽  
Dipak Dutta ◽  
Anif Jamaluddin ◽  
Jeng-Kuei Chang ◽  
Ching-Yuan Su
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Self Assembly ◽  
Porous Electrode ◽  
Energy Storage Devices ◽  
Hierarchically Porous ◽  
3D Graphene ◽  
Storage Devices ◽  
Flexible Supercapacitor ◽  
Exfoliated Graphene

We present here, a concentration dependent freeze-dry technique to obtain 3D graphene architectures with predetermined micron sized macropores and multimodal hierarchical nanopores for electrodes in flexible energy storage devices.

scholarly journals Aqueous exfoliated graphene by amphiphilic nanocellulose and its application in moisture-responsive foldable actuators

Nanoscale ◽  
2019 ◽  
Vol 11 (24) ◽  
pp. 11719-11729 ◽  
Author(s):  
Xuezhu Xu ◽  
You-Lo Hsieh
Keyword(s):  
Energy Storage ◽  
Photovoltaic Cells ◽  
Promising Material ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Exfoliated Graphene

Graphene is a promising material for diverse applications, such as in composites, optoelectronics, photovoltaic cells, and energy storage devices.

scholarly journals Controlled Size Reduction of Liquid Exfoliated Graphene Micro-Sheets via Tip Sonication

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1049
Author(s):  
Chiara Di Berardino ◽  
Péter Bélteky ◽  
Fabian Schmitz ◽  
Francesco Lamberti ◽  
Enzo Menna ◽  
...  
Keyword(s):  
Structural Damage ◽  
Three Dimensional ◽  
Size Distributions ◽  
Lateral Size ◽  
Exfoliated Graphene ◽  
Graphene Flakes ◽  
Shear Mixing ◽  
Edge Defects ◽  
Mixed Approach ◽  
Few Layer Graphene

Liquid exfoliation of three-dimensional bulk solids with an inherent layered structure is an effective and scalable method to produce stable re-aggregation colloidal inks of 2D materials that are suitable for solution processing. Shear mixing is a relatively gentle technique that allows exfoliation while preserving the native lateral size of the 3D precursors, while tip sonication often leads to extensive structural damage, producing 2D sheets where many edge defects are introduced. We present a mixed approach to obtain liquid dispersions of few-layer graphene flakes, wherein the average lateral size of the colloids can be tuned in a controlled way. This strategy relies on the application of defined tip sonication steps on graphene inks previously prepared through the use of a shear mixer, thus starting with already-exfoliated micro-sheets with a limited amount of edge defects. Our approach could represent a valuable method to prepare 2D material inks with variable size distributions, as differences in this parameter could have a significant impact on the electronic behavior of the final material and thus on its field of application.

Electrochemical fabrication of polyaniline/graphene paper (PANI/GP) supercapacitor electrode materials on free-standing flexible graphene paper

2021 ◽  
pp. 095400832110231
Author(s):  
Fengyan Lv ◽  
Shanxin Xiong ◽  
Xiaoqin Wang ◽  
Jia Chu ◽  
Runlan Zhang ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Electrode Materials ◽  
Electrochemical Polymerization ◽  
High Specific Capacitance ◽  
Energy Storage Devices ◽  
Supercapacitor Electrode ◽  
Free Standing ◽  
Flexible Electrode ◽  
Storage Devices ◽  
Graphene Paper

Free-standing flexible supercapacitive electrodes have practical application for wearable energy storage devices. In this paper, graphene paper (GP), a flexible electrode substrate, was prepared by one-step reduction of graphene oxide (GO) using HI solution. GP can be used independently as a flexible electrode with specific capacitance of 227 F/g. In order to make up for the shortage of GP specific capacitance storage, polyaniline (PANI) with high specific capacitance and good electrical conductivity was selected to composite with GP by electrochemical polymerization approach. This method to fabricate electrode material by direct electrochemical polymerization avoids the use of conductive binder and organic solvent. Owing to the specific capacitance contribution of PANI and GP, the PANI/GP composites exhibit higher specific capacitance when the polymerization time is 30 s and the polymerization voltage is 0.8 V. At 1 A/g current density, the specific capacitance of composite is up to 759 F/g, which is 3.34 times of neat GP.

scholarly journals Characterizing the maximum number of layers in chemically exfoliated graphene

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Péter Szirmai ◽  
Bence G. Márkus ◽  
Julio C. Chacón-Torres ◽  
Philipp Eckerlein ◽  
Konstantin Edelthalhammer ◽  
...  
Keyword(s):  
Single Layer ◽  
Vapour Phase ◽  
Single Layer Graphene ◽  
Graphene Layers ◽  
Layer Graphene ◽  
Exfoliated Graphene ◽  
Upper Limit ◽  
Number Of Layers ◽  
Graphene Flakes ◽  
Few Layer Graphene

AbstractAn efficient route to synthesize macroscopic amounts of graphene is highly desired and bulk characterization of such samples, in terms of the number of layers, is equally important. We present a Raman spectroscopy-based method to determine the typical upper limit of the number of graphene layers in chemically exfoliated graphene. We utilize a controlled vapour-phase potassium intercalation technique and identify a lightly doped stage, where the Raman modes of undoped and doped few-layer graphene flakes coexist. The spectra can be unambiguously distinguished from alkali doped graphite, and modeling with the typical upper limit of the layers yields an upper limit of flake thickness of five layers with a significant single-layer graphene content. Complementary statistical AFM measurements on individual few-layer graphene flakes find a consistent distribution of the layer numbers.

Flexible energy storage devices based on graphene paper

2011 ◽  
Vol 4 (4) ◽  
pp. 1277 ◽  
Author(s):  
Hyeokjo Gwon ◽  
Hyun-Suk Kim ◽  
Kye Ung Lee ◽  
Dong-Hwa Seo ◽  
Yun Chang Park ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Graphene Paper

scholarly journals Electroburning of few-layer graphene flakes, epitaxial graphene, and turbostratic graphene discs in air and under vacuum

2015 ◽  
Vol 6 ◽  
pp. 711-719 ◽  
Author(s):  
Andrea Candini ◽  
Nils Richter ◽  
Domenica Convertino ◽  
Camilla Coletti ◽  
Franck Balestro ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Ambient Conditions ◽  
Gap Formation ◽  
Lithographic Patterning ◽  
Layer Graphene ◽  
Exfoliated Graphene ◽  
Graphene Flakes ◽  
Different Types ◽  
Few Layer Graphene

Graphene-based electrodes are very promising for molecular electronics and spintronics. Here we report a systematic characterization of the electroburning (EB) process, leading to the formation of nanometer-spaced gaps, on different types of few-layer graphene (namely mechanically exfoliated graphene on SiO2, graphene epitaxially grown on the C-face of SiC and turbostratic graphene discs deposited on SiO2) under air and vacuum conditions. The EB process is found to depend on both the graphene type and on the ambient conditions. For the mechanically exfoliated graphene, performing EB under vacuum leads to a higher yield of nanometer-gap formation than working in air. Conversely, for graphene on SiC the EB process is not successful under vacuum. Finally, the EB is possible with turbostratic graphene discs only after the creation of a constriction in the sample using lithographic patterning.

An aqueous hybrid electrolyte for low-temperature zinc-based energy storage devices

2020 ◽  
Vol 13 (10) ◽  
pp. 3527-3535 ◽  
Author(s):  
Nana Chang ◽  
Tianyu Li ◽  
Rui Li ◽  
Shengnan Wang ◽  
Yanbin Yin ◽  
...  
Keyword(s):  
Energy Storage ◽  
Low Temperature ◽  
Energy Storage Devices ◽  
Storage Devices

A frigostable aqueous hybrid electrolyte enabled by the solvation interaction of Zn2+–EG is proposed for low-temperature zinc-based energy storage devices.

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