scholarly journals Facile Fabrication of Polyaniline/Graphene Composite Fibers as Electrodes for Fiber-Shaped Supercapacitors

2021 ◽  
Vol 11 (18) ◽  
pp. 8690
Author(s):  
Xuefei Yang ◽  
Yihan Qiu ◽  
Mei Zhang ◽  
Liangjing Zhang ◽  
Hongwei Li
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Flexible Electronics ◽  
Graphene Nanosheets ◽  
Chemical Reduction ◽  
Attractive Potential ◽  
Composite Fibers ◽  
Graphene Composite ◽  
Uniform Dispersion ◽  
Facile Fabrication

Graphene fiber-based supercapacitors are known as the potential energy resources for wearable/flexible electronics. However, increasing their specific capacitance and energy density remains a significant challenge. This paper indicates a double layer capacitance of the graphene nanosheets accompanied by pseudocapacitive behavior of the polyaniline to prepare composite fibers with high capacitive response. The polyaniline/graphene composite fibers (PANI/GFs) were synthesized by the self-assembled strategy and chemical reduction by HI. The wrinkle architecture of graphene nanosheets and uniform dispersion of the polyaniline are beneficial to increase the internal electroactive sites and provide a stable structure for the composite fibers. The constructed fiber-shaped supercapacitors with solid-state electrolyte deliver an excellent areal specific capacitance of 370.2 mF cm−2 and an outstanding areal energy density of 12.9 μW h cm−2. The current work reveals the attractive potential of the as-synthesized composite fibers for constructing fiber-shaped supercapacitors with distinguished electrochemical performance, which can be applied in future flexible electronics.

scholarly journals Nano-RuO2 -Decorated Holey Graphene Composite Fibers for Micro-Supercapacitors with Ultrahigh Energy Density

Small ◽  
2018 ◽  
Vol 14 (29) ◽  
pp. 1800582 ◽  
Author(s):  
Shengli Zhai ◽  
Chaojun Wang ◽  
Huseyin Enis Karahan ◽  
Yanqing Wang ◽  
Xuncai Chen ◽  
...  
Keyword(s):  
Energy Density ◽  
Ultrahigh Energy ◽  
Composite Fibers ◽  
Graphene Composite

scholarly journals Facile Fabrication of Polyvinyl Alcohol/Edge-Selectively Oxidized Graphene Composite Fibers

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3525
Author(s):  
Taehoon Kim ◽  
Gayeong Han ◽  
Yeonsu Jung
Keyword(s):  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Chemical Reduction ◽  
Composite Fibers ◽  
X Ray ◽  
Water Dispersible ◽  
Advantages And Disadvantages ◽  
Graphene Derivatives ◽  
The Matrix ◽  
Facile Fabrication

Graphene derivatives are effective nanofillers for the enhancement of the matrix mechanical properties; nonetheless, graphene oxide (GO), reduced GO, and exfoliated graphene all present distinct advantages and disadvantages. In this study, polyvinyl alcohol (PVA) composite fibers have been prepared using a recently reported graphene derivative, i.e., edge-selectively oxidized graphene (EOG). The PVA/EOG composite fibers were simply fabricated via conventional wet-spinning methods; thus, they can be produced at the commercial level. X-ray diffractometry, scanning electron microscopy, and two-dimensional wide-angle X-ray scattering analyses were conducted to evaluate the EOG dispersibility and alignment in the PVA matrix. The tensile strength of the PVA/EOG composite fibers was 631.4 MPa at an EOG concentration of 0.3 wt %, which is 31.4% higher compared with PVA-only fibers (480.6 MPa); compared with PVA composite fibers made with GO, which is the most famous water-dispersible graphene derivative, the proposed PVA/EOG ones exhibited about 10% higher tensile strength. Therefore, EOG can be considered an effective nanofiller to enhance the strength of PVA fibers without additional thermal or chemical reduction processes.

An efficient chemical reduction-induced assembly of Fe3O4@graphene fiber for wire-shaped supercapacitors with ultrahigh volumetric energy density

2021 ◽  
Vol 64 (10) ◽  
pp. 2246-2254
Author(s):  
Peng Xiao ◽  
MinJie Shi ◽  
Li Xu ◽  
FengBo Tao ◽  
Yu Li ◽  
...  
Keyword(s):  
Energy Density ◽  
Chemical Reduction

scholarly journals Microwave-Assisted Synthesis of Ge/GeO2-Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Capacity for Lithium-Ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 319
Author(s):  
Ji-Hye Koo ◽  
Seung-Min Paek
Keyword(s):  
Discharge Capacity ◽  
Graphene Nanosheets ◽  
Lithium Ion ◽  
Microwave Assisted Synthesis ◽  
Graphene Composite ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Significant Research ◽  
Long Term Performance ◽  
Term Performance

Germanium/germanium oxide nanoparticles with theoretically high discharge capacities of 1624 and 2152 mAh/g have attracted significant research interest for their potential application as anode materials in Li-ion batteries. However, these materials exhibit poor long-term performance due to the large volume change of 370% during charge/discharge cycles. In the present study, to overcome this shortcoming, a Ge/GeO2/graphene composite material was synthesized. Ge/GeO2 nanoparticles were trapped between matrices of graphene nanosheets to offset the volume expansion effect. Transmission electron microscopy images revealed that the Ge/GeO2 nanoparticles were distributed on the graphene nanosheets. Discharge/charge experiments were performed to evaluate the Li storage properties of the samples. The discharge capacity of the bare Ge/GeO2 nanoparticles in the first discharge cycle was considerably large; however, the value decreased rapidly with successive cycles. Conversely, the present Ge/GeO2/graphene composite exhibited superior cycling stability.

scholarly journals Fabrication of Hierarchical NiMoO4/NiMoO4 Nanoflowers on Highly Conductive Flexible Nickel Foam Substrate as a Capacitive Electrode Material for Supercapacitors with Enhanced Electrochemical Performance

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1143 ◽  
Author(s):  
Anil Yedluri ◽  
Tarugu Anitha ◽  
Hee-Je Kim
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Material ◽  
High Performance ◽  
Nickel Foam ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

Hierarchical NiMoO4/NiMoO4 nanoflowers were fabricated on highly conductive flexible nickel foam (NF) substrates using a facile hydrothermal method to achieve rapid charge-discharge ability, high energy density, long cycling lifespan, and higher flexibility for high-performance supercapacitor electrode materials. The synthesized composite electrode material, NF/NiMoO4/NiMoO4 with a nanoball-like NF/NiMoO4 structure on a NiMoO4 surface over a NF substrate, formed a three-dimensional interconnected porous network for high-performance electrodes. The novel NF/NiMoO4/NiMoO4 nanoflowers not only enhanced the large surface area and increased the electrochemical activity, but also provided an enhanced rapid ion diffusion path and reduced the charge transfer resistance of the entire electrode effectively. The NF/NiMoO4/NiMoO4 composite exhibited significantly improved supercapacitor performance in terms of a sustained cycling life, high specific capacitance, rapid charge-discharge capability, high energy density, and good rate capability. Electrochemical analysis of the NF/NiMoO4/NiMoO4 nanoflowers fabricated on the NF substrate revealed ultra-high electrochemical performance with a high specific capacitance of 2121 F g−1 at 12 mA g−1 in a 3 M KOH electrolyte and 98.7% capacitance retention after 3000 cycles at 14 mA g−1. This performance was superior to the NF/NiMoO4 nanoball electrode (1672 F g−1 at 12 mA g−1 and capacitance retention 93.4% cycles). Most importantly, the SC (NF/NiMoO4/NiMoO4) device displayed a maximum energy density of 47.13 W h kg−1, which was significantly higher than that of NF/NiMoO4 (37.1 W h kg−1). Overall, the NF/NiMoO4/NiMoO4 composite is a suitable material for supercapacitor applications.

Facile fabrication of PVA composite fibers with high fraction of multiwalled carbon nanotubes by gel spinning

2017 ◽  
Vol 58 (1) ◽  
pp. 37-45 ◽  
Author(s):  
Yizhe Wei ◽  
Dengpan Lai ◽  
Liming Zou ◽  
Xinlong Ling ◽  
Hongwei Lu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Composite Fibers ◽  
Gel Spinning ◽  
Multiwalled Carbon ◽  
Facile Fabrication ◽  
High Fraction

Facile Fabrication of Multivalent VO x /Graphene Nanocomposite Electrodes for High‐Energy‐Density Symmetric Supercapacitors

2021 ◽  
pp. 2100768
Author(s):  
Ailun Huang ◽  
Maher F. El‐Kady ◽  
Xueying Chang ◽  
Mackenzie Anderson ◽  
Cheng‐Wei Lin ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Facile Fabrication ◽  
Graphene Nanocomposite ◽  
Nanocomposite Electrodes
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