Papers by Keyword: Mesoporous Carbon

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Authors: Hao Tian, Yan Zhang, Yun Jiang Liu
Abstract: A series of titanium doped ordered mesoporous carbons (Ti-OMCs) were prepared by employing titanium modified resol as source for the first time. The effect of titanium content and F127 content on the microstructure of Ti-OMCs was investigated by X-ray diffraction (XRD), N2 sorption isothermal and Transmission electron microscopy (TEM). The results showed that regularity of products decreased with the increase of titanium content. A mesophase transformation from 2-D hexagonal (P6mm) to body-centered cubic () structure can be achieved by decreasing F127 content.
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Authors: Xiao Ping Dong, Jie Fu, Jun Hao Jin, Chen Chen
Abstract: Mesoporous carbon CMK-3 with high surface area and opened pore structure was used to adsorb the basic dye, Malachite green (MG). The equilibrium adsorption data was well described by the Langmuir model, and a very high Langmuir adsorption capacity was obtained by this adsorbent. The adsorption kinetics was found to be best represented by a pseudo-second-order kinetic model.
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Authors: Farinaa Md Jamil, Mohd Ali Sulaiman, Suhaina Mohd Ibrahim, Abdul Kadir Masrom, Muhd Zu Azhan Yahya
Abstract: Effect of glucose loading on the synthesis mesoporous carbon had been studied using hard template method where mesoporous silica SBA-15 was used as a template. To obtain a large pore of mesoporous carbon sample, a large pore of silica template was used. A series of mesoporous carbon sample was synthesized by loading different amounts of glucose (2.5g, 5.0g and 10.0g) as a carbon precursor to ensure that the template was fully impregnated with precursor. After treatment process, the surface area of carbon samples were measured with Brunauer-Emmett-Teller (BET) analysis and it shows that higher amount of glucose gives higher surface area due to the large pore of the template used. The samples then were tested with cyclic voltammetry technique at different scan rates (10, 20, 30 and 50 mVs-1) in 6M KOH electrolyte. It reveals that higher surface area samples show a higher specific capacitance with 119 F/g at slow scan rate 10 mVs-1.
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Authors: Farinaa Md Jamil, Mohd Ali Sulaiman, Suhaina Mohd Ibrahim, Abdul Kadir Masrom, Muhd Zu Azhan Yahya
Abstract: A series of mesoporous carbon sample had been synthesized by using a modification of template silica, SBA-15. Sucrose was added into a large pore size of SBA-15 by using incipient wetness impregnation method. A proper carbonization and removal silica process had been done to produce large pore size of mesoporous carbon. Two electrode cells were prepared by coating mesoporous carbon into stainless steel mesh as a supercapacitor electrode. A few of electrolyte concentration also had been investigated by cyclic voltammetry using a various concentration of KOH in the range 1-12 M. It shows that 6M KOH gives a better performance of EDLC.
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Authors: Xiu Li Gao, Wei Xing, Jin Zhou, Shu Ping Zhuo
Abstract: Arrays of ordered carbon nanotubes (OCNT) was synthesized successfully using aluminated mesoporous silica as hard template. XRD tests and TEM observations showed that OCNT was composed of carbon nanotube arrays in p6mm symmetry. N2 sorption analyses demonstrated that OCNT possesses typical mesoporous structure and centralized mesopore distribution. OCNT are superior to Maxsorb, an active carbon with super high surface area, in capacitive behavior and power output due to their ordered pore-structure, which favors the fast diffusion of hydrated ions. As evidenced by cyclic voltammetry measurements, OCNT show good capacitive behaviors (exhibiting a high capacitance of 180 F/g even at very high sweep rate of 50 mV/s, as compared with much reduced capacitance of 73 F/g for Maxsorb at the same sweep rate). OCNT can provide very high power density while still maintaining good energy density, thus having potential uses in electrochemical double layer capacitor (EDLC), particularly where both high power output and energy density are required.
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Authors: Gui Qiang Wang, Liang Wang, Shu Ping Zhuo
Abstract: Mesoporous carbon (MC) materials with surface area of 400 m2g-1 were prepared and incorporated into the polymer gel electrolyte comprising of polyvinylidene fluoride and 1-methyl-3-hexylimidazolium iodide to fabricate the composite gel electrolytes. The photovoltaic performance of the quasi-solid-state dye-sensitized solar cells was improved through incorporating MC into electrolyte. The dye-sensitized solar cell with composite gel electrolyte containing 3 wt% MC achieved the best photovoltaic performance, and the corresponding open-circuit voltage, short-circuit current density, fill factor and overall conversion efficiency were 0.59V, 13.22 mAcm-2, 0.66 and 5.15%, respectively. The stability of dye-sensitized solar cells with composite gel electrolyte was far superior to the cell with organic liquid electrolyte.
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Authors: Chao Xian Wang, Chang Yong Sun, Chang Jiang Yu, Yong Xiu Li, Jian Zhao, De Xuan Huang, Yi Bing Song
Abstract: Highly ordered macro- and meso- porous carbon materials were prepared in a facile nanocasting approach using colloidal crystals silica and SBA-15 as starting template, respectively. The synthesized macroporous carbon templated from colloidal silica shows a honeycomb-like morphology and three-dimensionally interconnected networks of macrospores of about 400 nm in diameter. The resulting mesoporous carbon derived from SBA-15 templates exhibits high specific area (1206m2/g), large pore volume (1.097cc/g) and uniform pore size distribution (3.64 nm). These carbon materials were employed to aerobic oxidation of glucose as support of Au NPs catalyst. 2wt% Au NPs/mesoporous carbon shows high catalytic activity due to highly dispersion of Au NPs resulting from the confinement effects of mesoporous carbon.
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Authors: Gui Qiang Wang, Liang Wang, Shu Ping Zhuo
Abstract: Mesoporous carbon (MC) materials with wormhole-like mesopores were prepared and incorporated into the polymer gel electrolyte comprising of polyvinylidene fluoride and 1-methyl-3-hexylimidazolium iodide. These gel composites were employed as the electrolyte for quasi-solid-state dye-sensitized solar cells. The photovoltaic performance of the quasi-solid-state dye-sensitized solar cells improved through incorporating MC into electrolyte. The dye-sensitized solar cell with composite gel electrolyte containing 3 wt% MC achieved the best photovoltaic performance, and the corresponding open-circuit voltage, short-circuit current density, fill factor and overall conversion efficiency were 0.59V, 13.22 mAcm-2, 0.66 and 5.15%, respectively. The stability of dye-sensitized solar cells with composite gel electrolyte was found to be far superior to the cell with organic liquid electrolyte.
1078
Authors: Yu Rong Liu
Abstract: Two kinds of mesoporous carbons (MPC) with three-dimensional (3D) body-centered cubic (Imm) and 2D hexagonal symmetry (p6m) were synthesized by using triblock copolymer PEO-PPO-PEO (F127) and diblock copolymer polydimethylsiloxane-poly (ethylene oxide) (PDMS-PEO) as co-templates and were further activated by nitric acid oxidation. The electrochemical performances of MPCs and acid-modified MPCs (H-MPCs) electrodes were investigated. After nitric acid modification, the capacitive performances of MPCs were obviously improved. The acid-modified sample with 2D p6m symmetry (H-2D-MPC) exhibited the highest specific capacitance of 237.1 F g-1 in 6 M KOH at the current density of 1 A g-1 and could be a potential candidate for supercapacitors.
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Authors: Yu Tao Chen, Xiao Hua Chen, Bin Yi, Kai Min Guo, Yun Fei Chen, Bin Zeng, Hai Mei Yan
Abstract: A kind of Carbon nanotube-implanted mesoporous carbon sphere (CNTs-MCS) is successfully prepared by a facile polymerization-induced colloid aggregation method using gelatin as a soft template. SEM, TEM, BET measurement and BJH method reveal that the obtained CNTs-MCS possess a mesoporous character, with specific surface area (284 m2•g-1) and uniform pore size of 3.9 nm. As the electrode material for supercapacitor in 6 mol•L-1 KOH, a low equivalent series resistance of 0.9 Ω cm2 and a maximum specific capacitance of 189 F•g-1 with a measured power density of 8 kW•kg-1 at energy density of 26.3 Wh•kg-1 are obtained.
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