Novel Nanoporous Carbon Derived from Coal Tar Pitch/polyethylene Glycol Diacid Blends as Electrodes for Ultracapacitors

2006 ◽  
Vol 973 ◽  
Author(s):  
Ramakrishnan Rajagopalan ◽  
Keith Perez ◽  
Henry Foley
Keyword(s):  
Polyethylene Glycol ◽  
Specific Capacitance ◽  
Surface Area ◽  
High Surface ◽  
Coal Tar ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
Coal Tar Pitch ◽  
Polyfurfuryl Alcohol ◽  
Nanoporous Carbon Materials

ABSTRACTNanoporous carbon materials with high surface area (1500 – 2000 m2/g) and narrow pore size distribution ranging from 1 – 3 nm were synthesized using polyfurfuryl alcohol/polyethylene glycol diacid and coal tar pitch/polymer blends. Electrical double layer capacitance of synthesized carbon was measured using cyclic voltammetry. There is a strong correlation between the surface area of the carbon and the specific capacitance. Carbon that had surface area smaller than 1000 m2/g had specific capacitance less than 50 F/g while the carbons having surface area from 1000 – 1500 m2/g showed specific capacitances in the order of 200 -250 F/g. It was shown that the mesoporosity and macroporosity in the parent carbon are critical for both activation and as well as the specific capacitance of the material. The use of these carbons in EDLCs was also demonstrated by fabricating a two-electrode ultracapacitor.

Electrochemical performance of high surface area activated carbons derived from coal tar pitch

Carbon ◽  
2019 ◽  
Vol 145 ◽  
pp. 773 ◽  
Author(s):  
Kai Wang ◽  
Chao Gao ◽  
Song-en Li ◽  
Jin-yu Wang ◽  
Xiao-dong Tian ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Surface Area ◽  
Activated Carbons ◽  
High Surface ◽  
Coal Tar ◽  
High Surface Area ◽  
Coal Tar Pitch

scholarly journals Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

2019 ◽  
Vol 5 (1) ◽  
pp. 10 ◽  
Author(s):  
Lok Shrestha ◽  
Mamata Thapa ◽  
Rekha Shrestha ◽  
Subrata Maji ◽  
Raja Pradhananga ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Rice Husk ◽  
Carbon Materials ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
Adsorption Properties ◽  
Methylene Blue Adsorption ◽  
Nanoporous Carbon Materials

Iodine and methylene blue adsorption properties of the high surface area nanoporous carbon materials derived from agro-waste and rice husk is reported. Rice husk was pre-carbonized at 300 °C in air followed by leaching out the silica nanoparticles by extraction with sodium hydroxide solution. The silica-free rice husk char was mixed with chemical activating agents sodium hydroxide (NaOH), zinc chloride (ZnCl2), and potassium hydroxide (KOH) separately at a mixing ratio of 1:1 (wt%) and carbonized at 900 °C under a constant flow of nitrogen. The prepared carbon materials were characterized by scanning electron microscopy (SEM), Fourier transformed-infrared spectroscopy (FT-IR), powder X-ray diffraction (pXRD), and Raman scattering. Due to the presence of bimodal micro- and mesopore structures, KOH activated samples showed high specific surface area ca. 2342 m2/g and large pore volume ca. 2.94 cm3/g. Oxygenated surface functional groups (hydroxyl, carbonyl, and carboxyl) were commonly observed in all of the samples and were essentially non-crystalline porous particle size of different sizes (<200 μm). Adsorption study revealed that KOH activated samples could be excellent material for the iodine and methylene blue adsorption from aqueous phase. Iodine and methylene blue number were ca. 1726 mg/g and 608 mg/g, respectively. The observed excellent iodine and methylene blue adsorption properties can be attributed to the well-developed micro- and mesopore structure in the carbon material. This study demonstrates that the agricultural waste, rice husk, and derived nanoporous carbon materials would be excellent adsorbent materials in water purifications.

scholarly journals High Surface Area Nanoporous Graphitic Carbon Materials Derived from Lapsi Seed with Enhanced Supercapacitance

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 728 ◽  
Author(s):  
Lok Kumar Shrestha ◽  
Rekha Goswami Shrestha ◽  
Subrata Maji ◽  
Bhadra P. Pokharel ◽  
Rinita Rajbhandari ◽  
...  
Keyword(s):  
Surface Area ◽  
Current Density ◽  
Electrode Materials ◽  
Carbon Materials ◽  
High Surface ◽  
High Surface Area ◽  
Graphitic Carbon ◽  
High Rate ◽  
Surface Areas ◽  
Nanoporous Carbon Materials

Nanoporous activated carbon materials derived from agro-wastes could be suitable low-cost electrode materials for high-rate performance electrochemical supercapacitors. Here we report high surface area nanoporous carbon materials derived from Lapsi seed agro-waste prepared by zinc chloride (ZnCl2) activation at 700 °C. Powder X-ray diffraction (pXRD) and Raman scattering confirmed the amorphous structure of the resulting carboniferous materials, which also incorporate oxygen-containing functional groups as confirmed by Fourier transform infrared (FTIR) spectroscopy. Scanning and transmission electron microscopy (SEM and TEM) analyses revealed the granular, nanoporous structures of the materials. High-resolution TEM (HR-TEM) confirmed a graphitic carbon structure containing interconnected mesopores. Surface areas and pore volumes of the materials were found, respectively, in the ranges from 931 to 2272 m2 g−1 and 0.998 to 2.845 cm3 g−1, and are thus superior to commercially available activated carbons. High surface areas, large pore volumes and interconnected mesopore structures of these Lapsi seed-derived nanoporous carbon materials lead to their excellent electrochemical supercapacitance performance in aqueous electrolyte (1 M H2SO4) with a maximum specific capacitance of 284 F g−1 at a current density of 1 A g−1. Furthermore, the electrodes showed high-rate capability sustaining 67.7% capacity retention even at high current density of 20 A g−1 with excellent cycle stability achieving 99% capacitance retention even after 10,000 charge–discharge cycles demonstrating the potential of Lapsi seed derived nanoporous carbons as suitable electrode materials in high-performance supercapacitor devices.

Thermal Stabilization of γ-Al2O3 with Modification of Polyethylene Glycol by Reverse Precipitation Method

2012 ◽  
Vol 560-561 ◽  
pp. 169-173
Author(s):  
Yu Sheng Wu ◽  
Jiao Ma ◽  
Fang Hu
Keyword(s):  
Polyethylene Glycol ◽  
Surface Area ◽  
High Surface ◽  
Catalyst Support ◽  
High Surface Area ◽  
Thermal Stabilization ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
Different Content ◽  
Reverse Precipitation

A series of γ-Al2O3 modified with different content of polyethylene glycol (PEG) was prepared by a reverse precipitation method. The phase transformation, thermal stabilization and the morphology of PEG-modified γ-Al2O3 was studied by XRD, BET and TEM, respectively. The results showed that the γ-Al2O3 with 1mol% PEG-modified has the excellent thermal stabilization after calcined at 1100°C for 3h. With the content of PEG increasing, the surface area of γ-Al2O3 was reduced gradually. Simultaneity, the γ-Al2O3 phase was transferred to θ-Al2O3 with the surface area 92 m2g-1 and a pore volume of 0.77 cm3g-1. The high surface area maintained at such high treatment temperature shows the 1mol% PEG-modified γ-Al2O3 prepared by reverse precipitation method can be applied in the automotive three-way catalyst support.

Facile Preparation of Microporous Carbons with High Specific Capacitance from Coal Tar Pitch for Supercapacitors

2012 ◽  
Vol 557-559 ◽  
pp. 1205-1209
Author(s):  
Nan Zhao ◽  
Xiao Jun He ◽  
Ping Hua Ling ◽  
Ru Chin Li ◽  
Mo Xin Yu ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Microwave Heating ◽  
Surface Area ◽  
Pore Volume ◽  
Coal Tar ◽  
Heating Time ◽  
Coal Tar Pitch ◽  
Mass Ratio ◽  
Microporous Carbons

Microporous carbons (MCs) for supercapacitors were prepared from coal tar pitch (CTP) with potassium hydroxide (KOH) as activating agent at different KOH/CTP mass ratio by different heating modes. The results show that the specific surface area (SBET), micropore surface area (Smic), total pore volume (Vt) and micropore volume ((Vmic) of MCs made by microwave heating at 30 min heating time increases with the KOH/CTP mass ratio, respectively. At 14/7 of the KOH/CTP mass ratio, the SBET of MCs made by microwave heating at 30 min heating time reaches 1786 m2/g while that of MCs made by conventional heating at 180 min heating time is 1769 m2/g. The specific capacitance and energy density of the former reaches 269 F/g and 9.2 Wh/kg in 6 M KOH aqueous electrolyte while that of the latter is up to 307 F/g and 10.5 Wh/kg, respectively. And yet, the former brings bigger MC yield and bigger retention of energy density. The effects of the pore size distribution and pore volume on the specific capacitance and energy density of MC samples with the similar SBET by different heating modes are addressed in this paper.

Polyaniline based charcoal/Ni nanocomposite material for high performance supercapacitors

2018 ◽  
Vol 2 (4) ◽  
pp. 811-819 ◽  
Author(s):  
E. Elanthamilan ◽  
A. Sathiyan ◽  
S. Rajkumar ◽  
E. Joan Sheryl ◽  
J. Princy Merlin
Keyword(s):  
Specific Capacitance ◽  
Surface Area ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
High Specific Capacitance ◽  
Nanocomposite Material

Among the synthesized PANI, PANI/AC, and PANI/AC/Ni nanomaterials, PANI/AC/Ni exhibits high specific capacitance (Cs) due to its high surface area.

Preparation and Electrochemical Characterization of an Activated Carbon Material of High Surface Area for Supercapacitor

2012 ◽  
Vol 463-464 ◽  
pp. 410-414 ◽  
Author(s):  
Jing Li ◽  
Xiao Dong Zhao
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
Surface Area ◽  
Carbon Material ◽  
Chemical Activation ◽  
High Surface ◽  
High Surface Area ◽  
High Specific Capacitance ◽  
Carbon Electrode ◽  
Equivalent Series Resistance

A low-cost organic compound mainly comprising of polyarylate was selected as precursor and a chemical activation method was used to prepare an activated carbon material of large surface area, with which the activated carbon electrodes of high specific capacitance were fabricated for supercapacitor. Impact of activating temperature on the specific capacitance of activated carbon electrode was studied, the relationship between the pore structure, surface area and specific capacitance of activated carbon electrode were discussed. The specific capacitance and ESR (equivalent series resistance ) of the electrode fabricated with the activated carbon prepared at 700°C is 211F.g-1 and 0.2Ω/cm2 in hydrous electrolyte and the 122F/g and 1Ω/cm2 in orgnic electrolyte respectively. Because of the different ion diameter in orgnic and hydrous electrolyte, activated electrode show different electrochemical behavior in cyclic voltammetry examinations.

scholarly journals High surface area nanoporous carbon derived from high quality jute from Bangladesh

2018 ◽  
Vol 216 ◽  
pp. 491-495 ◽  
Author(s):  
Junayet Hossain Khan ◽  
Jianjian Lin ◽  
Christine Young ◽  
Babasaheb M. Matsagar ◽  
Kevin C.W. Wu ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
High Quality
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