scholarly journals Thermоchemical Transformation in the Process of Obtaining and Modification of Nanoporous Carbon

2016 ◽  
Vol 3 (1) ◽  
pp. 56-64
Author(s):  
M. Nykoliuk ◽  
B. Rachiy ◽  
I. Budzulyak ◽  
L. Moroz
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Material ◽  
Isothermal Aging ◽  
Thermal Activation ◽  
Nanoporous Carbon ◽  
Linear Heating ◽  
Thermochemical Transformation ◽  
Nanoporous Carbon Material

The paper is devoted to the study of the thermochemical transformation in the process ofobtaining and modification of nanoporous carbon. Nanoporous carbon material, which was gottenin carbonization process, is characterized by specific surface area. The thermogravimetric study ofmaterials with linear heating and isothermal aging at a certain temperature were made to study theeffect of thermal activation, which was conducted in air and argon atmospheres

Carbon material with high specific surface area and high pseudocapacitance: Possible application in supercapacitors

2021 ◽  
Vol 319 ◽  
pp. 111063
Author(s):  
Yury M. Volfkovich ◽  
Valentin E. Sosenkin ◽  
Alexei Y. Rychagov ◽  
Alexandr V. Melezhik ◽  
Alexei G. Tkachev ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Material ◽  
High Specific Surface Area

scholarly journals N, S-Codoped Activated Carbon Material with Ultra-High Surface Area for High-Performance Supercapacitors

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1982
Author(s):  
Qinghua Yuan ◽  
Zhuwen Ma ◽  
Junbiao Chen ◽  
Zhenrui Huang ◽  
Zeming Fang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Specific Capacitance ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Material ◽  
High Surface ◽  
Koh Activation ◽  
Supercapacitor Electrode ◽  
Tobacco Stalk

The recycling of macromolecular biowastes has been a problem for the agriculture industry. In this study, a novel N, S-codoped activated carbon material with an ultrahigh specific area was produced for the application of a supercapacitor electrode, using tobacco stalk biowastes as the carbon source, KOH as the activating agents and thiourea as the doping agent. Tobacco stalk is mainly composed of cellulose, but also contains many small molecules and inorganic salts. KOH activation resulted in many mesopores, giving the tobacco stem-activated carbon a large specific surface area and double-layer capacitance. The specific surface area of the samples reached up to 3733 m2·g−1, while the maximum specific capacitance of the samples obtained was up to 281.3 F·g−1 in the 3-electrode tests (1 A·g−1). The doping of N and S elements raised the specific capacitance significantly, which could be increased to a value as high as 422.5 F·g−1 at a current density of 1 A·g−1 in the 3-electrode tests, but N, S-codoping also led to instability. The results of this article prove that tobacco stalks could be efficiently reused in the field of supercapacitors.

Finding the Specific Surface Area of an Organomineral Sorbent Produced by Electroplasma Treatment of Coal Flotation Waste

2021 ◽  
Vol 887 ◽  
pp. 603-609
Author(s):  
A.S. Kondratenko ◽  
S.L. Buyantuev ◽  
S.Yu. Shishulkin
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Thermal Activation ◽  
Thermal Destruction ◽  
Adsorption Model ◽  
Langmuir Adsorption ◽  
Coal Flotation ◽  
Solid Adsorbent ◽  
Before And After

This paper dwells upon finding the specific surface area of cake, a coal enrichment waste, exposed to electroplasma treatment; the goal is to make an organomineral porous material to be used as a sorbent for wastewater treatment. The research team used a monomolecular Langmuir adsorption model and surface tension of the surfactants before and after adsorption at the interface of solution and solid adsorbent. Another process considered herein was thermal activation of substances in the electroplasmic reactor for making organomineral porous materials from coal cakes. The paper presents the resulting specific surfaces area of the organomineral sorbent thus produced. Thus, the waste of flotation, i.e. coal cake, is fundamentally suitable for making porous substances by thermal destruction in an electroplasma reactor.

scholarly journals Synthesis and Characterization of Nanoporous Carbon Materials; The Effect of Surfactant Concentrations and Salts

2011 ◽  
Vol 8 (1) ◽  
pp. 196-200 ◽  
Author(s):  
Shokoofeh Geranmayeh ◽  
Alireza Abbasi ◽  
Alireza Badiei
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Self Assembly ◽  
Nanoporous Carbon ◽  
Pluronic F127 ◽  
Molar Ratio ◽  
Soft Template ◽  
Carbon Framework ◽  
Evaporation Induced Self Assembly

Nanoporous carbon framework was synthesized using phenol and formaldehyde as carbon precursors and triblock copolymer (pluronic F127) as soft templateviaevaporation induced self-assembly. Hexagonal mesoporous carbon with specific surface area of 350 m2/g through optimizing the situation was obtained. The effects of different surfactant/phenol molar ratio and presence of salts on specific surface area, pore size and pore volume for all the prepared samples were studied by means of the Brunauer-Emmett-Teller (BET) formalism, powder X-ray diffraction technique and FT-IR spectroscopy.

Preparation of Porous Silica by Acid Dissociation of Thermally Activated Kaolinite

2011 ◽  
Vol 284-286 ◽  
pp. 1381-1384 ◽  
Author(s):  
Guang Hui Li ◽  
Wei Cheng ◽  
Tao Jiang ◽  
Na Sun ◽  
Ling Feng Ai
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Thermal Activation ◽  
Porous Silica ◽  
Acid Dissociation ◽  
Tem Analysis ◽  
Thermally Activated ◽  
High Resolution Tem ◽  
The Relationship

Preparation of porous silica from thermally activated kaolinite was investigated by using acid dissociation process, and the relationship between structural transformation and acid dissociation properties of aluminium were elucidated. AlVI transfers into AlV and AlIV when kaolinite changes into metakaolinite during thermal activation. AlV is dissoluble in acid, while AlVI, AlIV are difficult to be dissolved into acid, therefore, the coordinations of aluminium affect acid dissociation of alumina markedly. Mesoporous silica is made by acid dissociation alumina of metakaolinite, and the specific surface area of porous silica is determined by acid dissociation ratio of alumina. The dissociation ratio of aluminum is up to 97% when kaolinite is activated at 900°C for 15 min. Specific surface area of the porous silica material is 357 m2/g, the pore volume is 0.43 cc/g, and BJH pore diameter is 2.18 nm. The pore is found to be in the worm-like shape by high resolution TEM analysis.

Development of Specific Surface Area in Carbon Material Prepared from Cassava Tuber Char Using a Chemical Activation Assisted Sonochemical Process

2017 ◽  
Vol 751 ◽  
pp. 695-700
Author(s):  
Kamonwan Aup-Ngoen ◽  
Mai Noipitak
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Material ◽  
Low Cost ◽  
Chemical Activation ◽  
Carbon Support ◽  
Proximate Analysis ◽  
Raw Material ◽  
Bet Analysis

The preparation of carbon materials from low-cost agricultural residues is presented in this work. Carbon products were prepared from carbonized cassava tuber (cassava tuber char, CTC) using a chemical activation assisted sonochemical process incorporating KOH as an activating agent. The physical properties such as proximate analysis, ultimate analysis and FTIR spectra of raw material were studied using cassava tuber collected from farmland in the Kanchanaburi Province. The structure of the precursor material played a significant role in influencing the quality and properties of the as-prepared carbon. It was found that the specific surface area of carbon products was improved through chemical activation assisted sonochemical process at 80 °C for 4 hours. The influence of KOH impregnation ratios on the specific surface area of the prepared carbon was also investigated in the activation step. Moreover, the properties of cassava tuber-carbon material were characterized by SEM, FTIR, XRD, and multipoint BET analysis. Finally, the application of cassava tuber carbon material as a carbon support for ZnO photocatalyst was investigated by a simple technique.

Fabrication and Basic Investigation of Flat Lignocellulosic Carbon Material for Self-Supporting Electrodes in Electric Double-Layer Capacitors

2013 ◽  
Vol 1497 ◽  
Author(s):  
Tsubasa Funabashi ◽  
Masamichi Sato ◽  
Masao Kitajima ◽  
Shuichi Shoji ◽  
Jun Mizuno
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Double Layer ◽  
Specific Surface Area ◽  
Photoelectron Spectroscopy ◽  
Carbon Material ◽  
Electric Double Layer ◽  
Vacuum Ultraviolet ◽  
Electrode Materials ◽  
Picea Jezoensis

ABSTRACTA novel flat, wood-based carbon material with heterogeneous pores, referred to as flat lignocellulosic carbon material (FLCM), was successfully fabricated by carbonizing samples of the softwood Picea jezoensis (Ezomatsu or Jezo spruce, a Japanese conifer). Simultaneous improvements of the specific surface area of the FLCM and the affinity of electric double-layer capacitor (EDLC) for electrolyte solvents were achieved by vacuum ultraviolet/ozone (VUV/O3) treatment. The specific surface area of the VUV/O3-treated FLCM showed a 50% increase over that of the original FLCM. The spectra measured by X-ray photoelectron spectroscopy (XPS) indicated that the number of O-C=O (carboxyl or ester) bonds increased, whereas the number of C-C bonds decreased. Additionally, the feasibility of using the FLCM as a self-supporting electrode in EDLCs was examined by measuring the electrochemical properties in a three-electrode system. The FLCM was confirmed as an appropriate self-supporting EDLC electrode material without warps and cracks. In addition, the FLCM can be used without any binder. Realization of FLCM-based EDLC electrodes with bendability, an area of several tens of square centimeters, and no risk of warp or crack formation, were indicated. Thus, FLCMs present a fascinating class of self-supporting carbon electrode materials for EDLCs.

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