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.

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

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

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.

scholarly journals Exceptional capacitive deionization rate and capacity by block copolymer–based porous carbon fibers

2020 ◽  
Vol 6 (16) ◽  
pp. eaaz0906 ◽  
Author(s):  
Tianyu Liu ◽  
Joel Serrano ◽  
John Elliott ◽  
Xiaozhou Yang ◽  
William Cathcart ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Ion Transport ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
High Capacity ◽  
Accessible Surface Area ◽  
High Rate ◽  
Capacitive Deionization ◽  
Porous Network ◽  
Hierarchical Porous

Capacitive deionization (CDI) is energetically favorable for desalinating low-salinity water. The bottlenecks of current carbon-based CDI materials are their limited desalination capacities and time-consuming cycles, caused by insufficient ion-accessible surfaces and retarded electron/ion transport. Here, we demonstrate porous carbon fibers (PCFs) derived from microphase-separated poly(methyl methacrylate)-block-polyacrylonitrile (PMMA-b-PAN) as an effective CDI material. PCF has abundant and uniform mesopores that are interconnected with micropores. This hierarchical porous structure renders PCF a large ion-accessible surface area and a high desalination capacity. In addition, the continuous carbon fibers and interconnected porous network enable fast electron/ion transport, and hence a high desalination rate. PCF shows desalination capacity of 30 mgNaCl g−1PCF and maximal time-average desalination rate of 38.0 mgNaCl g−1PCF min−1, which are about 3 and 40 times, respectively, those of typical porous carbons. Our work underlines the promise of block copolymer–based PCF for mutually high-capacity and high-rate CDI.

Radar Absorbing Properties of Light Radar Absorbing Materials Based on Hollow-porous Carbon Fibers

2009 ◽  
Vol 24 (2) ◽  
pp. 320-324 ◽  
Author(s):  
Wei XIE ◽  
Hai-Feng CHENG ◽  
Zeng-Yong CHU ◽  
Zhao-Hui CHEN ◽  
Yong-Jiang ZHOU
Keyword(s):  
Carbon Fibers ◽  
Porous Carbon ◽  
Absorbing Materials

scholarly journals Morphology, Conductivity and Electrochemical Properties of Hydrothermal Carbonized Porous Carbon Materials

2016 ◽  
Vol 3 (1) ◽  
pp. 46-55
Author(s):  
N. Nagirna ◽  
V. Mandzyuk
Keyword(s):  
Electrochemical Properties ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Specific Capacity ◽  
Carbonization Temperature ◽  
Electrochemical System ◽  
Plant Materials ◽  
Temperature Growth ◽  
Raw Plant Materials ◽  
Volume Decrease

The paper studies the morphology, conductivity and electrochemical properties ofcarbon materials, obtained from raw plant materials at different condition of hydrothermalcarbonization, using low-temperature porometry, impedance spectroscopy and galvanostaticcharge/discharge. It is set, that in porous structure of carbon materials micropores are dominant;when carbonization temperature increased the specific surface and pore volume decrease morethan 10 times. The temperature growth results in increasing the electrical conductivity of thecarbon material more than 6 orders. It is found, that the maximal value of specific capacity(1138 mА·h/g) has an electrochemical system based on porous carbon carbonized at 1023 K

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