One-step firing of carbon fiber and ceramic precursors for high performance electro-thermal composite: Influence of graphene coating

The exploration of multifunctional electrode materials has been a hotspot for the development of high-performance supercapacitors. We have used carbon fiber plates recovered from construction waste to prepare high-quality flexible carbon fiber materials by pyrolysis of epoxy resin. The as-prepared recycled carbon fiber has a diameter of 8 μm and is the perfect substrate material for flexible electrode materials. Furthermore, polyaniline and manganese dioxide are uniformly deposited on the recycled carbon fiber by one-step electrodeposition to form an active film. The recycled carbon fiber/polyaniline/MnO2 composite shows an excellent specific capacitance of 475.1 F·g−1 and capacitance retention of 86.1% after 5000 GCD cycles at 1 A·g−1 in 1 M Na2SO4 electrolyte. The composites optimized for electrodeposition time have more electroactive sites, faster ions and electron transfer, structural stability and higher conductivity, endowing the composites promising application prospect.

Download Full-text

One-step electropolymerization of methylene blue films on highly flexible carbon fiber electrode as supercapacitors

Micro and Nano Systems Letters ◽

10.1186/s40486-021-00130-7 ◽

2021 ◽

Vol 9 (1) ◽

Author(s):

Leandro Marques Samyn ◽

Rajendran Suresh Babu ◽

Mani Devendiran ◽

Ana Lucia Ferreira de Barros

Keyword(s):

Methylene Blue ◽

Carbon Fiber ◽

High Performance ◽

Organic Dyes ◽

Energy Storage Materials ◽

Promising Alternative ◽

Global Issues ◽

New Energy ◽

One Step ◽

Carbon Fiber Electrode

AbstractEnergy crisis and environmental pollution have been one of the major global issues. In this regard, the search for new energy storage materials is cheap, flexible and high-performance supercapacitors electrode which has become intensive. Also, reducing the amount of organic dyes polluting in water is a great significance. Herein, one-step electropolymerization of methylene blue on carbon fiber and the resulting films were applied to the supercapacitor. The high performance is associated to the outstanding conductivity, electrochemical stability and superior mechanical flexibility of carbon fiber. A new flexible electrode for supercapacitors was successfully fabricated by demonstrating with a good electrochemical performance and a promising alternative to reduce the water pollution.

Download Full-text

Nano MnO2 Radially Grown on Lignin-Based Carbon Fiber by One-Step Solution Reaction for Supercapacitors with High Performance

Nanomaterials ◽

10.3390/nano10030594 ◽

2020 ◽

Vol 10 (3) ◽

pp. 594 ◽

Cited By ~ 1

Author(s):

Chenyan Guo ◽

Haitong Ma ◽

Qingtong Zhang ◽

Mingfu Li ◽

Hongrui Jiang ◽

...

Keyword(s):

Electron Microscopy ◽

Carbon Fiber ◽

High Performance ◽

Room Temperature ◽

X Ray Diffraction ◽

X Ray ◽

One Step ◽

Solution Reaction ◽

Supercapacitor Applications ◽

Scanning Electron

MnO2-deposited lignin-based carbon fiber (MnO2-LCF) mats are fabricated for supercapacitor applications. LCF mats are produced from alkali lignin via electrospinning followed by stabilization and carbonization. The carbonization process is carried out at 800, 900, and 1000 °C, and the corresponding mats are denoted as MnO2-LCF-800, MnO2-LCF-900, and MnO2-LCF-1000, respectively. The LCF mats are immersed in a KMnO4 solution at room temperature for 72 h to obtain MnO2-LCF mats. The scanning electron microscopy and X-ray diffraction analysis confirm the deposition of MnO2 on the LCFs. The Brunauer–Emmett–Teller analysis, X-ray spectroscopy, and Raman spectroscopy reveal that MnO2-LCF-800 mat possesses a large number of mesopores and Mn vacancies as compared to MnO2-LCF-900 mat and MnO2-LCF-1000 mat. Consequently, MnO2-LCF-800 mat possesses the best electrochemical properties with a specific capacitance of 131.28 F∙g−1, an energy density of 14.77 Wh∙kg−1, and a power density of 135.01 W∙kg−1 at a specific current of 0.3 A∙g−1. Hence, MnO2-LCF-800 mat shows high potential to be used as a high-performance supercapacitor.

Download Full-text

Direct growth of CuCo2S4 nanosheets on carbon fiber textile with enhanced electrochemical pseudocapacitive properties and electrocatalytic properties towards glucose oxidation

Nanoscale ◽

10.1039/c8nr04519d ◽

2018 ◽

Vol 10 (29) ◽

pp. 14304-14313 ◽

Cited By ~ 68

Author(s):

Weina Xu ◽

Junlin Lu ◽

Wangchen Huo ◽

Jien Li ◽

Xue Wang ◽

...

Keyword(s):

Carbon Fiber ◽

High Performance ◽

Glucose Oxidation ◽

Glucose Sensors ◽

Electrocatalytic Properties ◽

Direct Growth ◽

One Step

CuCo2S4 nanosheets on carbon fiber textile were synthesized by a one-step hydrothermal procedure for high-performance supercapacitors and non-enzymatic glucose sensors.

Download Full-text

Study of Transcrystallization in Polymer Composites

MRS Proceedings ◽

10.1557/proc-170-117 ◽

1989 ◽

Vol 170 ◽

Cited By ~ 15

Author(s):

Benjamin S. Hsiao ◽

J. H. Eric

Keyword(s):

Thermal Conductivity ◽

Free Energy ◽

Carbon Fiber ◽

Plasma Treatment ◽

Polymer Composites ◽

High Performance ◽

Interfacial Strength ◽

Fiber Surface ◽

Semicrystalline Polymers ◽

First Case

AbstractTranscrystallization of semicrystalline polymers, such as PEEK, PEKK and PPS, in high performance composites has been investigated. It is found that PPDT aramid fiber and pitch-based carbon fiber induce a transcrystalline interphase in all three polymers, whereas in PAN-based carbon fiber and glass fiber systems, transcrystallization occurs only under specific circumstances. Epitaxy is used to explain the surface-induced transcrystalline interphase in the first case. In the latter case, transcrystallization is probably not due to epitaxy, but may be attributed to the thermal conductivity mismatch. Plasma treatment on the fiber surface showed a negligible effect on inducing transcrystallization, implying that surface-free energy was not important. A microdebonding test was adopted to evaluate the interfacial strength between the fiber and matrix. Our preliminary results did not reveal any effect on the fiber/matrix interfacial strength of transcrystallinity.

Download Full-text

Facile Fabrication of High‐Performance Hybrid Supercapacitor by One-Step, Self‐Grown Copper Nanopillar Forest Anchored with Fe3O4 Anode

International Journal of Precision Engineering and Manufacturing-Green Technology ◽

10.1007/s40684-021-00328-5 ◽

2021 ◽

Author(s):

Jaehak Lee ◽

Jae Young Seok ◽

Minyang Yang ◽

Bongchul Kang

Keyword(s):

High Performance ◽

Hybrid Supercapacitor ◽

One Step ◽

Facile Fabrication

Download Full-text

N, S and Transition-Metal Co-Doped Graphene Nanocomposites as High-Performance Catalyst for Glucose Oxidation in a Direct Glucose Alkaline Fuel Cell

Nanomaterials ◽

10.3390/nano11010202 ◽

2021 ◽

Vol 11 (1) ◽

pp. 202

Author(s):

Yexin Dai ◽

Jie Ding ◽

Jingyu Li ◽

Yang Li ◽

Yanping Zong ◽

...

Keyword(s):

Fuel Cell ◽

Active Sites ◽

High Performance ◽

Glucose Oxidation ◽

Alkaline Fuel Cell ◽

Blank Group ◽

Graphene Nanocomposites ◽

Doped Graphene ◽

One Step ◽

Hydrothermal Approach

In this work, reduced graphene oxide (rGO) nanocomposites doped with nitrogen (N), sulfur (S) and transitional metal (Ni, Co, Fe) were synthesized by using a simple one-step in-situ hydrothermal approach. Electrochemical characterization showed that rGO-NS-Ni was the most prominent catalyst for glucose oxidation. The current density of the direct glucose alkaline fuel cell (DGAFC) with rGO-NS-Ni as the anode catalyst reached 148.0 mA/cm2, which was 40.82% higher than the blank group. The DGAFC exhibited a maximum power density of 48 W/m2, which was more than 2.08 folds than that of blank group. The catalyst was further characterized by SEM, XPS and Raman. It was speculated that the boosted performance was due to the synergistic effect of N, S-doped rGO and the metallic redox couples, (Ni2+/Ni3+, Co2+/Co3+ and Fe2+/Fe3+), which created more active sites and accelerated electron transfer. This research can provide insights for the development of environmental benign catalysts and promote the application of the DGAFCs.

Download Full-text

Activated carbon fiber yarns with birnessite-type MnO2 and oxygen-functional groups for high-performance flexible asymmetric supercapacitors

Diamond and Related Materials ◽

10.1016/j.diamond.2021.108371 ◽

2021 ◽

pp. 108371

Author(s):

Xin Liu ◽

Limin Zang ◽

Yongjie Xu ◽

Qifan Liu ◽

Hui You ◽

...

Keyword(s):

Activated Carbon ◽

Carbon Fiber ◽

Functional Groups ◽

High Performance ◽

Activated Carbon Fiber ◽

Asymmetric Supercapacitors ◽

Oxygen Functional Groups

Download Full-text

Facile Synthesis of Uniform Mesoporous Nb2O5 Micro-Flowers for Enhancing Photodegradation of Methyl Orange

Materials ◽

10.3390/ma14143783 ◽

2021 ◽

Vol 14 (14) ◽

pp. 3783

Author(s):

Jian-Qing Qiu ◽

Huan-Qing Xie ◽

Ya-Hao Wang ◽

Lan Yu ◽

Fang-Yuan Wang ◽

...

Keyword(s):

Methyl Orange ◽

Active Sites ◽

High Performance ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

Flower Structure ◽

Electron Microscopies ◽

Bet Method ◽

One Step ◽

Catalytic Active Sites

The removal of organic pollutants using green environmental photocatalytic degradation techniques urgently need high-performance catalysts. In this work, a facile one-step hydrothermal technique has been successfully applied to synthesize a Nb2O5 photocatalyst with uniform micro-flower structure for the degradation of methyl orange (MO) under UV irradiation. These nanocatalysts are characterized by transmission and scanning electron microscopies (TEM and SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and UV-Vis diffuse reflectance spectroscopy (DRS). It is found that the prepared Nb2O5 micro-flowers presents a good crystal phases and consist of 3D hierarchical nanosheets with 400–500 nm in diameter. The surface area is as large as 48.6 m2 g−1. Importantly, the Nb2O5 micro-flowers exhibit superior catalytic activity up to 99.9% for the photodegradation of MO within 20 mins, which is about 60-fold and 4-fold larger than that of without catalysts (W/O) and commercial TiO2 (P25) sample, respectively. This excellent performance may be attributed to 3D porous structure with abundant catalytic active sites.

Download Full-text