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.

scholarly journals Effect of Air Oxidation on Texture, Surface Properties and Dye Adsorption of Wood-Derived Porous Carbon Materials

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1675 ◽  
Author(s):  
Suhong Ren ◽  
Liping Deng ◽  
Bo Zhang ◽  
Yafang Lei ◽  
Haiqing Ren ◽  
...  
Keyword(s):  
Surface Area ◽  
Functional Groups ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Dye Adsorption ◽  
Carbon Surface ◽  
Air Oxidation ◽  
Activation Temperature ◽  
Porous Carbon Materials ◽  
Hierarchical Porous

Hierarchical porous carbon materials made from cork were fabricated using a facile and green method combined with air activation, without any templates and chemical agents. The influence of air activation on the texture and other surface characteristics of the carbon materials were evaluated by various characterization techniques. Results indicate that air oxidation can effectively improve the surface area and the hierarchical porous structure of carbon materials, as well as increase the number of oxygen-containing functional groups on the carbon surface. The specific surface area and the pore volume of the carbon material activated by air at 450 °C (C800-M450) can reach 580 m2/g and 0.379 cm3/g, respectively. These values are considerably higher than those for the non-activated material (C800, 376 m2/g, 0.201 cm3/g). The contents of the functional groups (C–O, C=O and O–H) increased with rising activation temperature. After air activation, the adsorption capacity of the carbon materials for methylene blue (MB) and methyl orange (MO) was increased from 7.7 and 6.4 mg/g for C800 to 312.5 and 97.1 mg/g for C800-M450, respectively. The excellent dye removal of the materials suggests that the porous carbon obtained from biomass can be potentially used for wastewater treatment.

scholarly journals Adsorption enhancement of nitrogen gas by atomically heterogeneous nanospace of boron nitride

RSC Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 838-846
Author(s):  
Jun Kimura ◽  
Takahiro Ohkubo ◽  
Yuta Nishina ◽  
Koki Urita ◽  
Yasushige Kuroda
Keyword(s):  
Boron Nitride ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Heterogeneous Surfaces ◽  
Nitrogen Gas ◽  
Porous Carbon Materials

Porous BN with atomically heterogeneous surfaces can more strongly adsorb dinitrogen molecules than typical porous carbon materials.

scholarly journals Meso/Microporous Carbons from Conjugated Hyper-Crosslinked Polymers Based on Tetraphenylethene for High-Performance CO2 Capture and Supercapacitor

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 738
Author(s):  
Mohamed Gamal Mohamed ◽  
Mahmoud M. M. Ahmed ◽  
Wei-Ting Du ◽  
Shiao-Wei Kuo
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
Total Pore Volume ◽  
Specific Area ◽  
High Specific Capacitance ◽  
Koh Activation ◽  
Co2 Uptake ◽  
Crosslinked Polymers ◽  
Good Thermal Stability ◽  
Porous Carbon Materials

In this study, we successfully synthesized two types of meso/microporous carbon materials through the carbonization and potassium hydroxide (KOH) activation for two different kinds of hyper-crosslinked polymers of TPE-CPOP1 and TPE-CPOP2, which were synthesized by using Friedel–Crafts reaction of tetraphenylethene (TPE) monomer with or without cyanuric chloride in the presence of AlCl3 as a catalyst. The resultant porous carbon materials exhibited the high specific area (up to 1100 m2 g−1), total pore volume, good thermal stability, and amorphous character based on thermogravimetric (TGA), N2 adsoprtion/desorption, and powder X-ray diffraction (PXRD) analyses. The as-prepared TPE-CPOP1 after thermal treatment at 800 °C (TPE-CPOP1-800) displayed excellent CO2 uptake performance (1.74 mmol g−1 at 298 K and 3.19 mmol g−1 at 273 K). Furthermore, this material possesses a high specific capacitance of 453 F g−1 at 5 mV s−1 comparable to others porous carbon materials with excellent columbic efficiencies for 10,000 cycle at 20 A g−1.

scholarly journals Celery-derived porous carbon materials for superior performance supercapacitor

2021 ◽  
Author(s):  
Sirui Liu ◽  
Ya ping Xu ◽  
Jinggao Wu ◽  
Jing Huang
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
High Energy ◽  
Cycle Life ◽  
Superior Performance ◽  
Energy Output ◽  
Next Generation ◽  
Porous Carbon Materials ◽  
Long Cycle Life ◽  
Sustainable Materials

Supercapacitors are of paramount importance for next-generation applications, demonstrating high energy output, an ultra-long cycle life and utilizing green and sustainable materials. Herein, we utilize celery, a common biomass from...

scholarly journals Control of hydrogen release during borohydride electrooxidation with porous carbon materials

RSC Advances ◽  
2021 ◽  
Vol 11 (26) ◽  
pp. 15639-15655
Author(s):  
Małgorzata Graś ◽  
Grzegorz Lota
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
Catalyst Support ◽  
Hydrogen Release ◽  
Technological Application ◽  
Porous Carbon Materials ◽  
Borohydride Electrooxidation

The borohydride electrooxidation process is complex. Technological application of carbon materials is manifested not only in their use as a catalyst support, but also as a physical trap for hydrogen generated during the parasitic hydrolysis.

scholarly journals Biomass-Derived Porous Carbon Materials for Supercapacitor

2019 ◽  
Vol 7 ◽  
Author(s):  
Hui Yang ◽  
Shewen Ye ◽  
Jiaming Zhou ◽  
Tongxiang Liang
Keyword(s):  
Porous Carbon ◽  
Carbon Materials ◽  
Porous Carbon Materials
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