Interstitial nanoclusters within graphene sheets for highly conductive, strong and electrochemically active fiber-shaped supercapacitors

Hasan, Syed Waqar; Taha, Zain; Meng, Qinghao; Shen, Jianmin; Lyu, Taiyu; Zhu, Jinhui; Li, Changzheng; Tian, Zhi Qun; Shen, Pei Kang

doi:10.1016/j.apmt.2020.100768

Cited by 12 publications

(12 citation statements)

References 54 publications

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“…The demonstrative supercapacitors were prepared in a two symmetrical electrode configuration with gel electrolyte, and the electrochemical performances were evaluated in Figure . The cyclic voltammetry (CV) curves exhibited symmetric quasi-rectangular profiles at low scanning rate in Figure a confirming the electric double layer capacitance behavior . The specific capacitances were calculated from the galvanic charge–discharge (GCD) profiles in Figure d and showed a high value of 170.6 F g –1 at the current density of 0.05 A g –1 for the hollow GF and a much lower value of 66.3 F g –1 for the as wet-spun fiber with the same current density, GO dispersion, and needle.…”

Section: Resultsmentioning

confidence: 99%

“…The cyclic voltammetry (CV) curves exhibited symmetric quasi-rectangular profiles at low scanning rate in Figure 8a confirming the electric double layer capacitance behavior. 46 The specific capacitances were calculated from the galvanic charge−discharge (GCD) profiles in Figure 8d and showed a high value of 170.6 F g −1 at the current density of 0.05 A g −1 for the hollow GF and a much lower value of 66.3 F g −1 for the as wet-spun fiber with the same current density, GO dispersion, and needle. It might be attributed to larger specific surface area of the hollow GF than that of the wet-spun fiber with the same mass.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The rotating rate can range up to 150 rpm (max for the self-remade device), coordinating with the injection rate. To contrast, the wet-spun GFs had been prepared following the previous literature . In addition, GO ribbons can be obtained by reducing the immersion time in the ethanol, for example about 1 min, and drying in air with the roller subsequently (Figure S9).…”

Section: Methodsmentioning

confidence: 99%

“…The two symmetrical electrode configurations with gel electrolyte (PVA/H 3 PO 4 /H 2 O = 1:1:5 by weight) was assembled to evaluate electrochemical performances. , The length of each fiber is 2 cm, separated in parallel by gel electrolyte with a distance of 1.0 mm. The FSCs were left at room temperature to allow the gelation.…”

Section: Methodsmentioning

confidence: 99%

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Hollow Graphene Fibers with Archimedean-Type Spirals for Flexible and Wearable Electronics

Lan

Tian

Shen

2021

ACS Appl. Nano Mater.

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Graphene fiber (GF) processes attract prospects for flexible and wearable electronic applications by virtue of their excellent electrical conductivity, flexibility, strength, and being lightweight. Herein, we reported a facile method of fabricating hollow GFs with Archimedean-type spirals via a self-curing process induced from the counter-acting force of evaporation along a parabolic cross section. This strategy can boost the production rate up to 771.4 m h −1 by printing the graphene oxide (GO) dispersion onto a rotating roller and then immersing in ethanol with the roller instead of injecting that into the coagulation bath directly, breaking through the rate limitation of the solidification in the conventional wet-spinning method. The 3D printing process on the rotating roller can not only transfer the ejecting dispersion continuously to form gel fiber but also provide a unilateral support to compress the fiber in the radial direction to a compacted layer structure during the solvent exchange process. Meanwhile, a series of such kinds of fibers with various diameters can be efficiently obtained by adjusting critical fabricating parameters of the injecting rate and the rotating rate. The as-fabricated pristine hollow GFs showed a reasonable tensile strength of 190.5 MPa with 6.1% elongation strain and good durability for bending over 5000 cycles. The demonstrative supercapacitor with the GF exhibited a high specific capacitance of 170.6 F g −1 . With the specific structure and reasonable performances, the hollow GFs hold great potential application to flexible and wearable electronics like stretchable circuitries, sensors, flexible batteries, and wearable supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Hollow Graphene Fibers with Archimedean-Type Spirals for Flexible and Wearable Electronics

Lan

Tian

Shen

2021

ACS Appl. Nano Mater.

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“…However, pseudocapacitive material based on LDHs has a larger capacitance per gram than double-layer capacitors [15]. Aside from the choice of LDH materials, the nanostructure of LDHs plays an important role in facilitating ion transport within the electrode materials [16,17]. Based on the aforementioned issues, hierarchically porous materials and other hierarchical structures can help to improve superior specific capacitance and energy density, which is thought to be a viable strategy to improve NiCo-LDH electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Hydrazine Hydrate Induced Three-Dimensional Interconnected Porous Flower-like 3D-NiCo-SDBS-LDH Microspheres for High-Performance Supercapacitor

et al. 2022

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Porous structure and surface defects are important to improve the performance of supercapacitors. In this study, a facile pathway was developed for high-performance supercapacitors, which can produce transition metal hydroxides (LDHs) with abundant porous structure and surface defects. The NiCo-SDBS-LDH was prepared by one-step hydrothermal reaction using sodium dodecylbenzene sulfonate (SDBS) as anionic surfactant. And then, three dimensional (3D) interconnected porous flower-like 3D-NiCo-SDBS-LDH microspheres were designed and synthesized using the gas-phase hydrazine hydrate reduction method. Results showed that the hydrazine hydrate reduction not only introduces a large number of pores into 3D-NiCo-SDBS-LDH microspheres and causes the formation of oxygen vacancies, but it also roughens the surface of the microspheres. All these changes contribute to the enhancement of electrochemical activity of 3D-NiCo-SDBS-LDH; the NiCo-SDBS-LDH electrode after hydrazine hydrate treatment (3D-NiCo-SDBS-LDH) exhibits a higher specific capacitance of 1148 F·g−1 at 1 A·g−1 (about 1.46 times larger than that of NiCo-SDBS-LDH) and excellent long cycle life with 94% retention after 4000 cycles. Moreover, the assembled 3D-NiCo-SDBS-LDH//AC (active carbon) asymmetric supercapacitor (ASC) achieves remarkable energy density of 73.14 W h·kg−1 at 800 W·kg−1 and long-term cycling stability of 95.5% retention for up to 10,000 cycles. The outstanding electrochemical performance can be attributed to the synergy between the rich porous structure and the roughened surface that has been created by the hydrazine hydrate treatment.

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Hybrid electrodes composed of graphitic carbon nitride and zeolitic imidazolate framework‐67 for supercapacitor applications

Yetiman

Dokan

Önses

et al. 2022

Intl J of Energy Research

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Carbon-based materials with porous and layered forms have irreplaceable worth in renewable energy storage applications, especially after the graphene discovery. Among these materials, graphitic carbon nitride (g-C 3 N 4 ) shows great promise by including polymeric layers accentuate owing to its costeffective yet eco-friendly chemistry. Zeolitic imidazolate frameworks (ZIFs) also draw attention to possessing high surface area owing to porous structure. Herein, we present a rational co-synthesis of these materials for the fabrication of high-performance supercapacitors (SCs). G-C 3 N 4 @ZIF-67 hybrid electrode demonstrated a high specific capacitance of 657 F g À1 at the current density of 1 A g À1 . The specific capacitance of pure g-C 3 N 4 and ZIF-67 were 446 and 560 F g À1 at the same current density. Moreover, the capacitances only decay at 6%, 5%, and 10% after 3500 cycles for g-C 3 N 4 , ZIF-67, and g-

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Interstitial nanoclusters within graphene sheets for highly conductive, strong and electrochemically active fiber-shaped supercapacitors

Cited by 12 publications

References 54 publications

Hollow Graphene Fibers with Archimedean-Type Spirals for Flexible and Wearable Electronics

Hollow Graphene Fibers with Archimedean-Type Spirals for Flexible and Wearable Electronics

Hydrazine Hydrate Induced Three-Dimensional Interconnected Porous Flower-like 3D-NiCo-SDBS-LDH Microspheres for High-Performance Supercapacitor

Hybrid electrodes composed of graphitic carbon nitride and zeolitic imidazolate framework‐67 for supercapacitor applications

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