Effect of Carbon Surface Area on First Discharge Capacity of Li-O2Cathodes and Cycle-Life Behavior in Ether-Based Electrolytes

2012 ◽  
Vol 159 (12) ◽  
pp. A2135-A2142 ◽  
Author(s):  
Stefano Meini ◽  
Michele Piana ◽  
Hans Beyer ◽  
Jan Schwämmlein ◽  
Hubert A. Gasteiger
Keyword(s):  
Surface Area ◽  
Discharge Capacity ◽  
Cycle Life ◽  
Carbon Surface ◽  
First Discharge Capacity ◽  
Life Behavior

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.

NANOSTRUCTURED SnO2/C COMPOSITE ANODES IN LITHIUM-ION BATTERIES

2003 ◽  
Vol 02 (04n05) ◽  
pp. 299-306 ◽  
Author(s):  
CHIEN-TE HSIEH ◽  
JIN-MING CHEN ◽  
HSIU-WEN HUANG
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Coulombic Efficiency ◽  
Sol Gel ◽  
Lithium Ion ◽  
Surface Characteristics ◽  
Carbon Surface ◽  
Cyclic Voltammograms ◽  
Composite Anodes ◽  
Sol Gel Synthesis

Nanostructured SnO 2/ C composites used as anode materials were prepared by sol–gel synthesis to explore electrochemical properties in lithium-ion batteries. Surface characteristics of the SnO 2/ C nanocomposite were analyzed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that nanocrystalline SnO 2/ C with a grain size of 20–50 nm was uniformly dispersed on the carbon surface. After nanocrytalline SnO 2 coated onto carbon, the discharge capacity showed an increase up to 23%, i.e., from 300 to 370 mAh/g at a current density of 0.6 mA/cm2. The nanocomposite anode can achieve a fairly stable discharge capacity and excellent Coulombic efficiency (>99.5%) over 50 cycles. Cyclic voltammograms indicated that the improvements on capacity and cycleability were due to reversible alloying of nanosized Sn and Li on carbon surface.

Carbothermal process-derived porous N-doped carbon for flexible energy storage: Influence of carbon surface area and conductivity

2019 ◽  
Vol 378 ◽  
pp. 122158 ◽  
Author(s):  
Sandesh Y. Sawant ◽  
Moo Hwan Cho ◽  
Misook Kang ◽  
Thi Hiep Han
Keyword(s):  
Energy Storage ◽  
Surface Area ◽  
Carbon Surface

Effect of Loading Amount of Glucose Precursor on Mesoporous Carbon Surface Area for Supercapacitor Electrode Application

2016 ◽  
Vol 857 ◽  
pp. 101-105
Author(s):  
Farinaa Md Jamil ◽  
Mohd Ali Sulaiman ◽  
Suhaina Mohd Ibrahim ◽  
Abdul Kadir Masrom ◽  
Muhd Zu Azhan Yahya
Keyword(s):  
Surface Area ◽  
Mesoporous Carbon ◽  
Carbon Surface ◽  
Supercapacitor Electrode ◽  
Carbon Sample ◽  
Large Pore ◽  
Bet Analysis ◽  
Loading Amount ◽  
Silica Template ◽  
Effect Of Glucose

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.

scholarly journals Effect of Microwave Heating Conditions on the Preparation of High Surface Area Activated Carbon from Waste Bamboo

2015 ◽  
Vol 34 (7) ◽  
pp. 667-674
Author(s):  
Jian Wu ◽  
Hongying Xia ◽  
Libo Zhang ◽  
Yi Xia ◽  
Jinhui Peng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Microwave Heating ◽  
Surface Area ◽  
Microwave Power ◽  
High Surface ◽  
High Surface Area ◽  
Significant Proportion ◽  
Heating Time ◽  
Raw Material ◽  
Carbon Surface

Abstract The present study reports the effect of microwave power and microwave heating time on activated carbon adsorption ability. The waste bamboo was used to preparing high surface area activated carbon via microwave heating. The bamboo was carbonized for 2 h at 600°C to be used as the raw material. According to the results, microwave power and microwave heating time had a significant impact on the activating effect. The optimal KOH/C ratio of 4 was identified when microwave power and microwave heating time were 700 W and 15 min, respectively. Under the optimal conditions, surface area was estimated to be 3441 m2/g with pore volume of 2.093 ml/g and the significant proportion of activated carbon was microporous (62.3%). The results of Fourier transform infrared spectroscopy (FTIR) were illustrated that activated carbon surface had abundant functional groups. Additionally the pore structure is characterized using Scanning Electron Microscope (SEM).

Study of the Electrochemical Properties of H-LiMnBO3 Compound

2011 ◽  
Vol 197-198 ◽  
pp. 526-530 ◽  
Author(s):  
Guo Qiang Liu ◽  
Qiu Yang Wu ◽  
Bei Yue Ma
Keyword(s):  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Electrochemical Behavior ◽  
Hexagonal Structure ◽  
Cyclic Voltammogram ◽  
Space Group ◽  
Reductive Process ◽  
First Discharge Capacity

The compound h-LiMnBO3 with hexagonal structure and space group of P-6 was synthesized. This compound displayed a particular electrochemical behavior. In the voltage rang of 0.1-3.0 V at 5 mA/g, the first discharge capacity was around 1420 mAh/g. Cyclic voltammogram indicated that the reductive process took place below 1.5 V.

Influences of Rapid Quenching on the Structures and Electrochemical Performances of La0.7Mg 0.3Co0.45Ni 2.55-xFex (x = 0-0.4) Electrode Alloys

2011 ◽  
Vol 239-242 ◽  
pp. 2280-2285
Author(s):  
Yang Huan Zhang ◽  
Zhong Hui Hou ◽  
Hui Ping Ren ◽  
Xiao Gang Liu ◽  
Le Le Chen ◽  
...  
Keyword(s):  
Discharge Capacity ◽  
Rapid Quenching ◽  
Cycle Life ◽  
High Rate ◽  
Electrochemical Performances ◽  
Quenching Rate ◽  
Electrochemical Behaviors ◽  
Massive Structure ◽  
Rate Discharge ◽  
High Rate Discharge

The influences of rapid quenching on the structures and electrochemical behaviors of La-Mg-Ni system (PuNi3-type) La0.7Mg0.3Co0.45Ni2.55-xFex (x = 0, 0.1, 0.2, 0.3, 0.4) electrode alloys were systemically investigated. The results show that the rapid quenching, instead of changing the phase structures of the alloys, leads to c axis enlarged and the a axis and cell volumes of the LaNi5 and (La, Mg)Ni3 major phases decreased slightly. The morphologies of the as-quenched alloys exhibit a massive structure, which differ from that of the as-quenched AB5-type alloy. The rapid quenching clearly impairs some electrochemical performances of the alloys, involving discharge capacity, high rate discharge ability (HRD) and discharge potential, but it significantly prolongs the cycle life of the alloy. With an increase in the quenching rate from 0 (As-cast was defined as quenching rate of 0 m/s) to 30 m/s, the discharge capacity of the alloy (x = 0.4) decreases from 351.06 to 313.36 mAh/s, the HRD from 69.36 to 50.54%, whereas its cycle life increases from 106 to 166 cycles at a charging discharging current density of 600 mA/g.

Preparation and Electrochemical Properties of LiMnPO4 Nanoparticles by Polyol Method

2013 ◽  
Vol 566 ◽  
pp. 95-98 ◽  
Author(s):  
Takayuki Kodera ◽  
Fuminari Isobe ◽  
Takashi Ogihara
Keyword(s):  
Physical Properties ◽  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Polyol Method ◽  
Initial Discharge Capacity ◽  
Xrd Pattern ◽  
Initial Discharge ◽  
Olivine Structure ◽  
First Discharge Capacity ◽  
Good Agreement

Plate-like LiMnPO4particles were prepared by polyol method. The chemical and physical properties of plate-like LiMnPO4particles were characterized by XRD and SEM. The thickness of plate-like LiMnPO4particles was approximately 35 nm. XRD pattern of plate-like LiMnPO4was good agreement with orthorhombic olivine structure. The first discharge capacity of C/LiMnPO4cathode was approximately 95 mAh/g. 99.9 % of initial discharge capacity was maintained after 100 cycles.

scholarly journals ADSORPSI ZAT WARNA METILEN BIRU DENGAN KARBON AKTIF DARI KULIT DURIAN MENGGUNAKAN KOH DAN NaOH SEBAGAI AKTIVATOR

2017 ◽  
Vol 6 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Farida Hanum ◽  
Rikardo Jgst Gultom ◽  
Maradona Simanjuntak
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Contact Time ◽  
Wavelength Region ◽  
Second Order ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Activation Process ◽  
Maximum Surface

Durian is a kind of tropical fruits which can grow well in Indonesia. Durian is containing 60-75% shell. Durian shell could be a potential alternative to activated carbon because it contains 57.42% carbon. The aim of this research is to know the effect of contact time and  stirring speed to activated carbon adsorption capacity from durian shell with KOH and NaOH as activators. FTIR (Fourier Transform Infra Red) analysis showed the activation process effects on  absorption intensity  wavelength region and resulted in formation of C = C aromatic tape, so that the nature of the charcoal becomes more polar compared with the initial condition. Analysis using spectrophotometer UV-Vis to determine  absorbance and  final concentration of each variation of contact time and stirring speed. The results showed that the maximum adsorption capacity obtained by activation of KOH and NaOH on stirring speed of 150 rpm and a contact time of 90 minutes is equal to 3.92 mg / g and 3.8 mg / g respectively. The maximum surface area obtained by activation of KOH and NaOH during the stirring speed 130 rpm and a contact time of 120 minutes is equal to 1785.263 m2 / g and 1730.332 m2 / g respectively. The maximum surface area obtained from this research has met the standards of commercial activated carbon surface area was between 800-1800 m2/ g. Modeling pseudo second order presents a more representative adsorption data, a second order equation is based on the assumption that adsorption step is chemosorption.

scholarly journals A Phenomenological Study of the Reduction Potential of Porous and Non-Porous Carbons

1992 ◽  
Vol 9 (2) ◽  
pp. 84-91 ◽  
Author(s):  
Stuart S. Barton ◽  
Michael J.B. Evans
Keyword(s):  
Surface Area ◽  
Electrode Potential ◽  
Reduction Potential ◽  
Phenomenological Study ◽  
Carbon Surface ◽  
Porous Carbons ◽  
Initial State ◽  
A Value

A method is described for obtaining a value at the potential of a carbon bed which can be related to the pH of the electrolyte and the initial state of oxidation of the carbon surface. The results are interpreted according to a simplified picture of the ‘mixed electrode’ potential. This approach also indicates that the surface area of the carbon is an important potential-determining parameter.

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