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

Effect of Fluorine Content on the Electrochemical Properties of PVDF-Derived Carbons for Lithium Ion Battery

2012 ◽  
Vol 463-464 ◽  
pp. 730-733 ◽  
Author(s):  
Lu Shi ◽  
Chao Lin Miao ◽  
Gai Rong Chen ◽  
Bin Xu ◽  
Shi Chen
Keyword(s):  
Electrochemical Properties ◽  
Carbon Materials ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Fluorine Content ◽  
Lithium Ion ◽  
Bet Surface Area ◽  
Different Temperatures ◽  
Positive Effect ◽  
Initial Coulombic Efficiency

The carbon materials prepared by PVDF carbonization at different temperatures have similar BET surface area and pores volume. The content of fluorine in the carbons decreased with the carbonization temperature from 1.46% (atm %) at 600°C to 0.18 %( atm %) at 1000°C. The first cycle specific capacity and the initial coulombic efficiency decreases with the decrease of fluorine content in the samples. The first cycle discharge capacity decreased from 982 mAh/ g at 600°C to 752 mAh/ g at 1000°C and the initial coulombic efficiency decreased from 31.8% at 600°C to 24% at 1000°C. It is believed that fluorine contained in the carbon materials has a positive effect to improve the electrochemical properties as anode materials for Li-ion batteries.

Effect of synthesis conditions on the morphological and electrochemical properties of nitrogen-doped porous carbon materials

2019 ◽  
Vol 27 (9) ◽  
pp. 669-676 ◽  
Author(s):  
Andrii I. Kachmar ◽  
Volodymyra M. Boichuk ◽  
Ivan M. Budzulyak ◽  
Volodymyr O. Kotsyubynsky ◽  
Bogdan I. Rachiy ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Synthesis Conditions ◽  
Nitrogen Doped ◽  
Porous Carbon Materials

Ultrahigh-surface-area nitrogen-doped hierarchically porous carbon materials derived from chitosan and betaine hydrochloride sustainable precursors for high-performance supercapacitors

2019 ◽  
Vol 3 (5) ◽  
pp. 1215-1224 ◽  
Author(s):  
Jian Cheng ◽  
Qinqin Xu ◽  
Xia Wang ◽  
Zaiquan Li ◽  
Fuzhong Wu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Surface Area ◽  
Porous Carbon ◽  
High Performance ◽  
Carbon Materials ◽  
Hierarchically Porous ◽  
Nitrogen Doped ◽  
Porous Carbon Materials ◽  
Betaine Hydrochloride

A biobased polyelectrolyte was prepared and used successfully as a precursor for the fabrication of N-doped hierarchically porous carbon materials with tunable electrochemical properties in supercapacitors.

scholarly journals Impedance spectroscopy of capacitor systems based on saccharide-derived porous carbon materials.

2021 ◽  
Vol 22 (4) ◽  
pp. 711-716
Author(s):  
V.I. Mandzyuk ◽  
I.F. Mironyuk ◽  
N.Ya. Ivanichok ◽  
B.I. Rachiy
Keyword(s):  
Impedance Spectroscopy ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Specific Capacity ◽  
Electric Circuit ◽  
Double Electric Layer ◽  
Electrical Circuit ◽  
Activation Temperature ◽  
Porous Carbon Materials ◽  
Electrochemical Processes

The electrochemical processes in capacitor systems based on porous carbon materials (PCMs) derived from glucose, lactose, and saccharose at activation temperature of 800 and 1000°C are explored using impedance spectroscopy method. An equivalent electric circuit, which allows modeling of the impedance spectra in the frequency range from 10-2 to 105 Hz, is proposed, and a physical interpretation of each element of the electrical circuit is presented. It is set that in capacitor systems on the basis of the explored materials the accumulation of capacitance occurs due to the formation of a double electric layer at the electrode/electrolyte boundary, and Faradaic processes are minimized. The specific capacity of supercapacitors based on PCMs obtained at 800°C is 91-154 F/g due to the developed microporous structure of materials.

Structure and Electrochemical Properties of Saccharide-derived Porous Carbon Materials

2018 ◽  
Vol 10 (2) ◽  
pp. 02018-1-02018-7
Author(s):  
V. I. Mandzyuk ◽  
◽  
I. F. Myronyuk ◽  
V. M. Sachko ◽  
B. I. Rachiy ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Porous Carbon Materials

scholarly journals The carbonization of aromatic molecules with three-dimensional structures affords carbon materials with controlled pore sizes at the Ångstrom-level

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Tomoki Ogoshi ◽  
Yuma Sakatsume ◽  
Katsuto Onishi ◽  
Rui Tang ◽  
Kazuma Takahashi ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
Carbon Sources ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Thermal Polymerization ◽  
Sodium Ion Battery ◽  
Pore Sizes ◽  
Aromatic Molecules ◽  
Template Methods

AbstractCarbon materials with controlled pore sizes at the nanometer level have been obtained by template methods, chemical vapor desorption, and extraction of metals from carbides. However, to produce porous carbons with controlled pore sizes at the Ångstrom-level, syntheses that are simple, versatile, and reproducible are desired. Here, we report a synthetic method to prepare porous carbon materials with pore sizes that can be precisely controlled at the Ångstrom-level. Heating first induces thermal polymerization of selected three-dimensional aromatic molecules as the carbon sources, further heating results in extremely high carbonization yields (>86%). The porous carbon obtained from a tetrabiphenylmethane structure has a larger pore size (4.40 Å) than those from a spirobifluorene (4.07 Å) or a tetraphenylmethane precursor (4.05 Å). The porous carbon obtained from tetraphenylmethane is applied as an anode material for sodium-ion battery.

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