Porous Graphene-Carbon Nanotube Scaffolds for Fiber Supercapacitors

Park, Hun; Ambade, Rohan B.; Noh, Sung Hyun; Eom, Wonsik; Koh, Ki Hwan; Ambade, Swapnil B.; Lee, Wonjun; Kim, Seong Hun; Han, Tae Hee

doi:10.1021/acsami.8b17908

Cited by 86 publications

(52 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 87,88 ] The Raman spectrum of GO exhibits two characteristic peaks at 1344 cm −1 (D band) and 1598 cm −1 (G band), while that of RGO are 1347 cm −1 (D band) and 1588 cm −1 (G band), respectively. [ 89,90 ] After HI reduction, the G band of RGO shifts toward a lower wavenumber which suggests the occurrence of re‐graphitization, while the D band becomes more prominent due to an increase of defect level caused by the reduction reaction which is in agreement with previously reported results. [ 91,92 ] The intensity ratios of the D and G bands ( I D / I G ) calculated from the band intensity are 0.98 (GO) and 1.67 (RGO), respectively.…”

Section: Resultssupporting

confidence: 91%

“…The length capacitance ( C L , mF cm −1 ), areal capacitance ( C A , mF cm −2 ), volumetric capacitance ( C V , F cm −3 ), areal energy density ( E A , µWh cm −2 ), areal power density ( P A , µW cm −2 ), volumetric energy density ( E V , mWh cm −3 ) and volumetric power density ( P v, mW cm −3 ) were calculated according to the following equations

C_{L} = \frac{C_{A} \times A}{L}

C_{A} = \frac{2 \times I \times T}{A \times Δ U}

C_{V} = \frac{C_{A} \times A}{1000 V}

E_{A} = \frac{C_{A} \times Δ U^{2}}{3.6 \times 8}

P_{A} = \frac{3600 \times E_{A}}{T}

E_{V} = \frac{E_{A} \times A}{1000 V}

P_{V} = \frac{P_{A} \times A}{1000 V}

where I (mA) is the discharge current, T (s) is the discharge time (from GCD curves), L (cm) is the length of the microfiber electrode (measured by vernier caliper), D (cm) is the diameter of the microfiber electrode (from SEM images), A (cm 2 ) is the surface area of a single microfiber electrode ( A = πDL ), V (cm 3 ) is the volume of the microfiber electrode ( V = πL ( D /2) 2 ) and Δ U ( V ) is the potential window. [ 63,89 ]…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Chen

2020

Macro Materials & Eng

View full text Add to dashboard Cite

Thanks to their considerable electrochemical and mechanical properties, fiber‐shaped supercapacitors have become the most potential energy storage devices for portable and wearable electronics in the future; however, challenges still exist in the pursuit of practical applications among them. In this work, ternary microfibers, which are composed of TEMPO‐oxidized cellulose nanofibers/reduced graphene oxide microfiber cores coated with polypyrrole shell layers, are successfully fabricated through industrializable and sustainable wet‐spinning and interfacial polymerization strategies. The prepared microfibers possess well‐defined microstructures and outstanding mechanical properties (559 MPa). When assembled into symmetrical all‐solid‐state fiber‐shaped supercapacitors (FSCs), they exhibit remarkable electrochemical properties (647 mF cm−2, 14.37 µWh cm−2 at 0.1 mA cm−2), prominent cycling stability (92.5% capacitance retention and 92.6% coulomb efficiency after 10 000 cycles), and extraordinary flexibility (no significant decay in capacitance after 5000 bending cycles), which are superior to all the congeneric FSCs reported to date. The prominent performances are ascribed to the synergistic effect of the well‐designed ternary system and synergistic effects between interior components. The advantages in electrochemical, mechanical, and industrial properties of the ternary FSCs can provide reference and boost the development of flexible energy storage applications.

show abstract

Section: Resultssupporting

confidence: 91%

C_{L} = \frac{C_{A} \times A}{L}

C_{A} = \frac{2 \times I \times T}{A \times Δ U}

C_{V} = \frac{C_{A} \times A}{1000 V}

E_{A} = \frac{C_{A} \times Δ U^{2}}{3.6 \times 8}

P_{A} = \frac{3600 \times E_{A}}{T}

E_{V} = \frac{E_{A} \times A}{1000 V}

P_{V} = \frac{P_{A} \times A}{1000 V}

Section: Methodsmentioning

confidence: 99%

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Chen

2020

Macro Materials & Eng

View full text Add to dashboard Cite

show abstract

“…The 1 st category [191][192][193][194][195][196][197] consists of supercapacitors with low energy density (0-10 W h kg À1 ) and specic capacitance below 100 F g À1 , the 2 nd category 54,56,196,[198][199][200][201][202][203][204][205][206][207][208] consists of supercapacitors with energy density in the range of 10-40 W h kg À1 , the 3 rd category [209][210][211] consists of supercapacitors with an energy density range of 70-100 W h kg À1 , and the 4 th category [212][213][214] consists of supercapacitors with energy density from 140-160 W h kg À1 and the description of the materials is tabulated in Table 3. Recent progress in CNT based high-performance supercapacitors has been immensely investigated using various techniques [215][216][217][218][219][220][221][222][223][224][225][226][227][228][229][230] and more systematic investigations ar...…”

Section: Nanotubular Networkmentioning

confidence: 99%

Progress in supercapacitors: roles of two dimensional nanotubular materials

et al. 2020

View full text Add to dashboard Cite

show abstract

“…As an example, porous coupling CNT to graphene fibers allowed optimizing the ion accessibility to the electrode surface. The electrodes showed excellent mechanical flexibility and structural stability with negligible capacitance differences upon bending and twisting [317].…”

Section: Hybrid Structuresmentioning

confidence: 99%

The Role of Functionalization in the Applications of Carbon Materials: An Overview

Speranza

2019

View full text Add to dashboard Cite

The carbon-based materials (CbMs) refer to a class of substances in which the carbon atoms can assume different hybridization states (sp 1 , sp 2 , sp 3 ) leading to different allotropic structures -. In these substances, the carbon atoms can form robust covalent bonds with other carbon atoms or with a vast class of metallic and non-metallic elements, giving rise to an enormous number of compounds from small molecules to long chains to solids. This is one of the reasons why the carbon chemistry is at the basis of the organic chemistry and the biochemistry from which life on earth was born. In this context, the surface chemistry assumes a substantial role dictating the physical and chemical properties of the carbon-based materials. Different functionalities are obtained by bonding carbon atoms with heteroatoms (mainly oxygen, nitrogen, sulfur) determining a certain reactivity of the compound which otherwise is rather weak. This holds for classic materials such as the diamond, the graphite, the carbon black and the porous carbon but functionalization is widely applied also to the carbon nanostructures which came at play mainly in the last two decades. As a matter of fact, nowadays, in addition to fabrication of nano and porous structures, the functionalization of CbMs is at the basis of a number of applications as catalysis, energy conversion, sensing, biomedicine, adsorption etc. This work is dedicated to the modification of the surface chemistry reviewing the different approaches also considering the different macro and nano allotropic forms of carbon.C 2019, 5, 84 3 of 45 narrow graphite-like interconnected layers. This leads to a closed pore rigid structure that is chemically inert, hard but brittle [48][49][50].Due to the highly resistant, conductive, and inert network, glassy carbons are utilized in a series of rather different applications. They are utilized as electrodes in solid state batteries and in industrial harsh chemical processes where also high temperatures are involved such as crystallization of CaF2, CdS and ZnS. Glassy carbon can be utilized to manufacture high temperature furnace elements. Due to the chemical inertness, glassy carbons are utilized also in fabrication of protheses. Porous carbon and carbon black are much softer. Generally, in industrial applications important is the extension of the surface which is exposed to the external environment. The porous carbon is characterized by a high specific surface area enhancing the interaction with the external medium. Although it possesses a lower conductivity with respect to glassy carbon, the high porosity and the presence of active sites makes it a good material to fabricate electrodes for applications in electrochemistry [51][52][53] and bioelectrodes for sensing and stimulation [54,55].The same holds for the carbon black mainly utilized as additive in rubbers and polymers to improve their mechanical properties, or as a pigment [56] although new potentialities have been recently envisaged [57].Common to all the forms of carbon which are bri...

show abstract

Porous Graphene-Carbon Nanotube Scaffolds for Fiber Supercapacitors

Cited by 86 publications

References 56 publications

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Progress in supercapacitors: roles of two dimensional nanotubular materials

The Role of Functionalization in the Applications of Carbon Materials: An Overview

Contact Info

Product

Resources

About