Correlation of EDLC Capacitance with Physical Properties of Polyethylene Terephthalate Added Pitch-Based Activated Carbon

Abstract

The electric double-layer capacitor (EDLC) has attracted attention by using activated carbon (AC) as an active electrode material with a high power density and high cost-efficiency in industrial applications. The EDLC has been actively developed over the past decade to improve the power density and capacitance. Extensive studies on EDLCs have been conducted to investigate the relation of EDLC capacitance to the physical properties of AC, such as the specific surface area, pore type and size, and electrical conductivity. In this study, EDLC was fabricated with AC, and its capacitance was evaluated with the physical properties of AC. The AC was prepared using petroleum-based pitch synthesized using pyrolysis fuel oil (PFO) with polyethylene terephthalate (PET). The AC based on PFO and PET (PPAC) exhibited high specific surface area and low micropore fraction compared to the PFO-based AC without PET addition (PAC). Furthermore, the reduction of the EDLC capacitance of PPAC was smaller than that of PAC, as the scan rate was increased from 5 to 100 mV s−1. It was determined that the minor reduction of capacitance with an increase in the scan rate resulted from the development of 4 nm-sized mesopores in PPAC. In addition, a comprehensive correlation of EDLC capacitance with various physical properties of ACs, such as specific surface area, pore characteristics, and electrical conductivity, was established. Finally, the optimal properties of AC were thereupon derived to improve the EDLC capacitance.

Epoxidized natural rubber‐graft‐acrylonitrile (ENR‐g‐ACN)‐based solid polymer electrolytes for energy storage application

“…Better capacitances depend on several factors, such as high ionic conductivity, the porosity of the electrode, a larger surface area, pore distribution, the surface functional groups, the adhesiveness of the contact between electrode and electrolyte and ionic liquids. [25][26][27] According to this research, the different ionic conductivities of the PEs used caused the different capacitances of SPEs. The high-conductivity polymer matrix would allow many…”

Ammonium-ion energy storage devices for real-life deployment: storage mechanism, electrode design and system integration

“…The occurrence of this phenomenon is closely related to the surface characteristics, specific surface area and pore size distribution of electrode materials. 63,64 Therefore, porous materials with the advantages of high specific surface area, light weight, and low relative density have a natural advantage. 65,66 This adsorption is not selective and does not involve the transfer of electrons or the formation of chemical bonds.…”

Renewable Carbon Materials as Electrodes for High-Performance Supercapacitors: From Marine Biowaste to High Specific Surface Area Porous Biocarbons

“…Regarding applying these materials to supercapacitors, focusing on the electrolyte is also necessary. Numerous types of electrolytes were tested for supercapacitor applications. ,− ,,,,− However, a prerequisite is the high ionic concentration of the electrolyte, which improves its capacitance. On one hand, ionic liquids (ILs) present the required properties to be suitable candidates. , However, their high production/purification costs drastically reduce their attractiveness compared to conventional electrolytes.…”

“…The synthesis and applications of carbon materials prepared from biomass have been extensively reviewed, − while biomass-derived carbons from marine waste were recently reviewed by Lionetto et al Several studies on the capability of porous carbon-based electrodes from fish waste for supercapacitor applications have been reported, using different types of fish waste sources, from crab shells, fish and prawn scales, fish bones, and others. ,− The obtained materials presented Brunauer–Emmett–Teller (BET) surface areas ranging from 1670 to 962 m 2 g –1 , with an associated specific capacitance ranging from 58 F g –1 at 5 A g –1 to 519 F g –1 at 0.1 A g –1 . Considering the existing studies, the surface area and specific capacitance are not always strictly correlated (both increasing or decreasing), mainly because both can be affected by porosity and the functional groups of porous carbons …”