scholarly journals Design of Porous Carbons for Supercapacitor Applications for Different Organic Solvent-Electrolytes

2021 ◽  
Vol 7 (1) ◽  
pp. 15
Author(s):  
Joshua Bates ◽  
Foivos Markoulidis ◽  
Constantina Lekakou ◽  
Giuliano M. Laudone
Keyword(s):  
Activated Carbon ◽  
Ion Transport ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Porous Electrode ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Specific Area ◽  
Porous Electrodes

The challenge of optimizing the pore size distribution of porous electrodes for different electrolytes is encountered in supercapacitors, lithium-ion capacitors and hybridized battery-supercapacitor devices. A volume-averaged continuum model of ion transport, taking into account the pore size distribution, is employed for the design of porous electrodes for electrochemical double-layer capacitors (EDLCs) in this study. After validation against experimental data, computer simulations investigate two types of porous electrodes, an activated carbon coating and an activated carbon fabric, and three electrolytes: 1.5 M TEABF4 in acetonitrile (AN), 1.5 M TEABF4 in propylene carbonate (PC), and 1 M LiPF6 in ethylene carbonate:ethyl methyl carbonate (EC:EMC) 1:1 v/v. The design exercise concluded that it is important that the porous electrode has a large specific area in terms of micropores larger than the largest desolvated ion, to achieve high specific capacity, and a good proportion of mesopores larger than the largest solvated ion to ensure fast ion transport and accessibility of the micropores.

scholarly journals Insights into Enhanced Capacitive Behavior of Carbon Cathode for Lithium Ion Capacitors: The Coupling of Pore Size and Graphitization Engineering

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Kangyu Zou ◽  
Peng Cai ◽  
Baowei Wang ◽  
Cheng Liu ◽  
Jiayang Li ◽  
...  
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Density Functional ◽  
Density Functional Theory Calculation ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Experimental Result ◽  
Carbon Cathode ◽  
Capacitive Behavior

AbstractThe lack of methods to modulate intrinsic textures of carbon cathode has seriously hindered the revelation of in-depth relationship between inherent natures and capacitive behaviors, limiting the advancement of lithium ion capacitors (LICs). Here, an orientated-designed pore size distribution (range from 0.5 to 200 nm) and graphitization engineering strategy of carbon materials through regulating molar ratios of Zn/Co ions has been proposed, which provides an effective platform to deeply evaluate the capacitive behaviors of carbon cathode. Significantly, after the systematical analysis cooperating with experimental result and density functional theory calculation, it is uncovered that the size of solvated PF6− ion is about 1.5 nm. Moreover, the capacitive behaviors of carbon cathode could be enhanced attributed to the controlled pore size of 1.5–3 nm. Triggered with synergistic effect of graphitization and appropriate pore size distribution, optimized carbon cathode (Zn90Co10-APC) displays excellent capacitive performances with a reversible specific capacity of ~ 50 mAh g−1 at a current density of 5 A g−1. Furthermore, the assembly pre-lithiated graphite (PLG)//Zn90Co10-APC LIC could deliver a large energy density of 108 Wh kg−1 and a high power density of 150,000 W kg−1 as well as excellent long-term ability with 10,000 cycles. This elaborate work might shed light on the intensive understanding of the improved capacitive behavior in LiPF6 electrolyte and provide a feasible principle for elaborate fabrication of carbon cathodes for LIC systems.

scholarly journals Electrochemical Porosimetry

2001 ◽  
Vol 699 ◽  
Author(s):  
Hyun-Kon Song ◽  
Kun-Hong Lee
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Electrochemical Impedance ◽  
Porous Electrode ◽  
Porous Electrodes ◽  
Geometric Information ◽  
Impedance Data ◽  
Pore Length ◽  
Electrochemical Devices

AbstractWe have developed the electrochemical porosimetry analyzing microstructures of porous electrodes, which can give geometric information most meaningful in electrochemical systems. The methodology is based on the transmission line model with pore size distribution (TLM-PSD) that relates electrochemical impedance data with microstructural information. Pore length (lp), as well as pore size distribution, can be obtained by fitting the TLM-PSD to the experimental impedance data of a porous electrode. This geometric information was validated for the microporous, mesoporous and macroporous samples by comparing with the data obtained from conventional porosimetry. It was also shown that the electrochemical porosimetry could be used as a nondestructive probe to investigate the construction of electrochemical devices.

Desulfurization Properties of Activated Carbon Fibers

2014 ◽  
Vol 9 (2) ◽  
pp. 155892501400900 ◽  
Author(s):  
Wei Liu ◽  
Sabit Adanur
Keyword(s):  
Activated Carbon ◽  
Sulfur Dioxide ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Carbon Fibers ◽  
Adsorption Rate ◽  
Carbon Powder ◽  
Activated Carbon Fibers ◽  
Breakthrough Capacity

Activated carbon fibers (ACFs) are one of the most promising adsorbents due to their outstanding properties, such as more exposed adsorption surface, narrower pore size distribution, fast adsorption rate and flexibility, in comparison with granular activated carbon and activated carbon powder. In this work, ACFs manufactured from various raw materials were studied and their pore structures and sulfur dioxide removal performance under dry and humid conditions were investigated. From the ACFs studied in this paper, larger surface area was found correspond to higher total pore volume and larger DA micropore diameter. In dry air, breakthrough capacity of ACFs with sulfur dioxide was found to be proportionately dependent on micropore ratio and pore size distribution. Although powdered activated carbon (PAC) showed higher breakthrough capacity, its adsorption rate was slower than ACFs due to the difference of the pore structure. The presence of water vapor in the air stream greatly increased SO2 adsorption capacities of ACFs but affected their utilization differently.

scholarly journals “Water-in-salt” electrolyte enhanced high voltage aqueous supercapacitor with carbon electrodes derived from biomass waste-ground grain hulls

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35545-35556
Author(s):  
Mingjun Pang ◽  
Shang Jiang ◽  
Jianguo Zhao ◽  
Sufang Zhang ◽  
Runwei Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
High Voltage ◽  
High Specific Surface Area ◽  
Carbon Electrodes ◽  
Koh Activation ◽  
Biomass Waste

To design high specific surface area and optimize the pore size distribution of materials, we employ a combination of carbonization and KOH activation to prepare activated carbon derived from ground grain hulls.

scholarly journals Control of the pore size distribution and its spatial homogeneity in particulate activated carbon

Carbon ◽  
2014 ◽  
Vol 78 ◽  
pp. 113-120 ◽  
Author(s):  
Cheng Hu ◽  
Saeid Sedghi ◽  
S. Hadi Madani ◽  
Ana Silvestre-Albero ◽  
Hirotoshi Sakamoto ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Spatial Homogeneity
Sign in / Sign up

Export Citation Format

Share Document