scholarly journals Block copolymer–based porous carbon fibers

2019 ◽  
Vol 5 (2) ◽  
pp. eaau6852 ◽  
Author(s):  
Zhengping Zhou ◽  
Tianyu Liu ◽  
Assad U. Khan ◽  
Guoliang Liu
Keyword(s):  
Activated Carbon ◽  
Block Copolymer ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Microphase Separation ◽  
High Surface ◽  
Electrochemical Energy Storage ◽  
Interconnected Network ◽  
Surface Areas ◽  
Poly Acrylonitrile

Carbon fibers have high surface areas and rich functionalities for interacting with ions, molecules, and particles. However, the control over their porosity remains challenging. Conventional syntheses rely on blending polyacrylonitrile with sacrificial additives, which macrophase-separate and result in poorly controlled pores after pyrolysis. Here, we use block copolymer microphase separation, a fundamentally disparate approach to synthesizing porous carbon fibers (PCFs) with well-controlled mesopores (~10 nm) and micropores (~0.5 nm). Without infiltrating any carbon precursors or dopants, poly(acrylonitrile-block-methyl methacrylate) is directly converted to nitrogen and oxygen dual-doped PCFs. Owing to the interconnected network and the highly optimal bimodal pores, PCFs exhibit substantially reduced ion transport resistance and an ultrahigh capacitance of 66 μF cm−2 (6.6 times that of activated carbon). The approach of using block copolymer precursors revolutionizes the synthesis of PCFs. The advanced electrochemical properties signify that PCFs represent a new platform material for electrochemical energy storage.

Enhanced Mechanical Properties of Natural Rubber by Block Copolymer-Based Porous Carbon Fibers

2021 ◽  
Author(s):  
Wenqi Zhao ◽  
Zhen Xu ◽  
John Elliott ◽  
Cindy S. Barrera ◽  
Zacary L. Croft ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Block Copolymer ◽  
Natural Rubber ◽  
Carbon Fibers ◽  
Porous Carbon

Controlling the physical and electrochemical properties of block copolymer-based porous carbon fibers by pyrolysis temperature

2020 ◽  
Vol 5 (1) ◽  
pp. 153-165 ◽  
Author(s):  
Zhengping Zhou ◽  
Tianyu Liu ◽  
Assad U. Khan ◽  
Guoliang Liu
Keyword(s):  
Block Copolymer ◽  
Electrochemical Properties ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Pyrolysis Temperature ◽  
Processing Parameter ◽  
Important Processing

Pyrolysis temperature is an important processing parameter that determines the physical and electrochemical properties of block copolymer-based porous carbon fibers.

scholarly journals Capacitive Organic Dye Removal by Block Copolymer Based Porous Carbon Fibers

2020 ◽  
Vol 7 (16) ◽  
pp. 2000507
Author(s):  
Joel Marcos Serrano ◽  
Assad U. Khan ◽  
Tianyu Liu ◽  
Zhen Xu ◽  
Alan R. Esker ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Dye Removal ◽  
Organic Dye

Sustainable nitrogen-doped porous carbon with high surface areas prepared from gelatin for supercapacitors

2012 ◽  
Vol 22 (36) ◽  
pp. 19088 ◽  
Author(s):  
Bin Xu ◽  
Shanshan Hou ◽  
Gaoping Cao ◽  
Feng Wu ◽  
Yusheng Yang
Keyword(s):  
Porous Carbon ◽  
High Surface ◽  
Nitrogen Doped ◽  
Surface Areas

scholarly journals Photoconductivity of activated carbon fibers

1991 ◽  
Vol 6 (5) ◽  
pp. 1040-1047 ◽  
Author(s):  
K. Kuriyama ◽  
M.S. Dresselhaus
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Low Temperatures ◽  
Room Temperature ◽  
High Surface ◽  
Localized States ◽  
Activated Carbon Fibers ◽  
Disordered Carbon ◽  
Increasing Temperature

The conductivity and photoconductivity are measured on a high-surface-area disordered carbon material, i.e., activated carbon fibers, to investigate their electronic properties. This material is a highly disordered carbon derived from a phenolic precursor, having a huge specific surface area of 1000–2000 m2/g. Our preliminary thermopower measurements show that the dominant carriers are holes at room temperature. The x-ray diffraction pattern reveals that the microstructure is amorphous-like with Lc ≃ 10 Å. The intrinsic electrical conductivity, on the order of 20 S/cm at room temperature, increases by a factor of several with increasing temperature in the range 30–290 K. In contrast, the photoconductivity in vacuum decreases with increasing temperature. The magnitude of the photoconductive signal was reduced by a factor of ten when the sample was exposed to air. The recombination kinetics changes from a monomolecular process at room temperature to a bimolecular process at low temperatures, indicative of an increase in the photocarrier density at low temperatures. The high density of localized states, which limits the motion of carriers and results in a slow recombination process, is responsible for the observed photoconductivity.

Activated carbon fiber from liquefied wood and polyvinyl butyral as an additive for production of flexible all-carbon yarn supercapacitors

Holzforschung ◽  
2018 ◽  
Vol 72 (5) ◽  
pp. 367-374 ◽  
Author(s):  
Yuxiang Huang ◽  
Wenji Yu ◽  
Guangjie Zhao
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
High Surface ◽  
High Surface Area ◽  
Polyvinyl Butyral ◽  
Activated Carbon Fiber ◽  
Bet Surface Area ◽  
Liquefied Wood ◽  
New Material

AbstractA novel way to prepare mesoporous activated carbon fibers (ACFs-P) has been developed, while the ACFs-P with high surface area were obtained from liquefied wood by combining polyvinyl butyral (PVB) blending and steam activation. The porosity properties of the new material was investigated by N2adsorption and the Brunauer–Emmett–Teller (BET) surface area was found to be 2710 m2g−1and a pore volume of 1.540 cm3g−1, of which 58.2% was mesoporous with diameters between 3 and 6 nm. ACFs-P had a higher methylene blue (MB) adsorption capacity (962 mg/g) than the PVB-added carbon fibers (CFs-P) and ACFs-P without PVB (ACFs-C). Flexible all-carbon yarn supercapacitors can be produced from ACFs-P as powder or fiber. The fiber approach led to yarn supercapacitors with a less favorable electrochemical performance than the powder based production owing to the poor strength of the fibers. A 10 cm long yarn supercapacitor from the powdered ACFs exhibited a high specific length capacitance of 43 mF cm−1at 2 mV s−1. Yarn supercapacitors showed an excellent mechanical flexibility and its capacitor properties were not diminished after bending or crumpling.

ESR study of activated carbon fibers: preliminary results

1993 ◽  
Vol 8 (9) ◽  
pp. 2282-2287 ◽  
Author(s):  
S.L. di Vittorio ◽  
A. Nakayama ◽  
T. Enoki ◽  
M.S. Dresselhaus ◽  
M. Endo ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Carbon Fibers ◽  
Room Temperature ◽  
Broad Peak ◽  
Activated Carbon Fibers ◽  
Temperature Peak ◽  
Dangling Bond ◽  
Surface Areas ◽  
Spin Resonance

We have carried out Electron Spin Resonance (ESR) measurements on activated carbon fibers (ACF) with specific surface areas (SSA) of 3000 and 2000 m2/g. The ESR spectrum of ACF fibers in air is extremely broad (500 to 1000 Gauss), and the spin susceptibility decreases rapidly with decreasing specific surface area. Also measured was the ESR signal of the desorbed fibers in vacuum. As a result of desorption, the broad peak decreases slightly in intensity, and a narrow (≍65 Gauss at room temperature) peak appears. We report results on the temperature dependence of both peaks. The narrow peak is interpreted as due to spins associated with dangling bonds, whereas we attribute the broad peak to the conduction carrier spins which is broadened by the boundary scattering process (T1 contribution) and the dipolar broadening process (T2 contribution) associated with the dangling bond spins.

scholarly journals Preparation, Surface and Pore Structure of High Surface Area Activated Carbon Fibers from Bamboo by Steam Activation

Materials ◽  
2014 ◽  
Vol 7 (6) ◽  
pp. 4431-4441 ◽  
Author(s):  
Xiaojun Ma ◽  
Hongmei Yang ◽  
Lili Yu ◽  
Yin Chen ◽  
Ying Li
Keyword(s):  
Activated Carbon ◽  
Pore Structure ◽  
Surface Area ◽  
Carbon Fibers ◽  
High Surface ◽  
High Surface Area ◽  
Activated Carbon Fibers ◽  
Steam Activation
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