Premium
Facile Synthesis of Porous Carbon Via Self‐Activation of Potassium Acetate for High‐Performance Supercapacitor Electrodes with Excellent Cyclic Stability
Author(s) -
Kang Seok Hun,
Kim Bit Na,
Kim In Gyoo
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201801090
Subject(s) - supercapacitor , materials science , capacitance , carbonization , electrode , specific surface area , chemical engineering , carbon fibers , potassium hydroxide , activated carbon , electrolyte , electric double layer capacitor , composite material , chemistry , adsorption , organic chemistry , composite number , scanning electron microscope , engineering , catalysis
The capacitance of an electric double‐layer capacitor (EDLC) is largely determined by the surface area and the electrical conductivity of the electrode material. To enhance the performance of EDLCs, a separate activation procedure is commonly used to increase the porosity of the electrode. A facile and scalable method of producing highly porous carbon electrodes for high‐performance supercapacitors without a separate activation procedure via simple thermal treatment of potassium acetate is reported. Potassium acetate‐derived carbon (PAC) exhibits a high specific surface area of 1704 m 2 g −1 and superior electrical conductivity of 22 950 S cm −1 without further treatment. When used for EDLC electrodes, PAC displays a high specific capacitance of 195 F g −1 at 0.5 A g −1 and excellent cyclic stability with capacitance retention of 99.0% over 80 000 charge/discharge cycles. Carbonization and simultaneous self‐activation of PAC demonstrates a facile and efficient method of producing carbon electrodes with a high surface area without an additional activation procedure, which provides an efficient solution for producing high‐performance supercapacitor electrodes at low cost.