Premium
Silica‐assisted urea‐formaldehyde‐based carbon microspheres with enhanced supercapacitor performances as electrode
Author(s) -
Yue Jiaji,
Yuan Mengying,
Zhao Hui,
Li Mei
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48388
Subject(s) - materials science , supercapacitor , carbonization , chemical engineering , thermal stability , electrode , capacitance , electrolyte , pyrolysis , electrochemistry , composite material , scanning electron microscope , chemistry , engineering
Novel silica (SiO 2 )‐assisted urea‐formaldehyde‐based microspheres (SUFMs) have been successfully prepared by condensation polymerization with SiO 2 nanoparticles as template. The support effect of SiO 2 and the improved thermal stability of SUFM have been investigated. The SUFM is pyrolyzed at high temperature under Ar atmosphere to achieve its carbonized product (SUFCM), which retains its spherical morphology by alkali etching after carbonization. The SiO 2 acts as a stabilizer that limits the flowing domain of the melt resin around the SiO 2 . When used as the electrode material for supercapacitors, the SUFCM exhibits excellent electrochemical performance with a high specific capacitance of 218 F g −1 at 1 A g −1 in 2 M H 2 SO 4 aqueous electrolyte and a good rate capability of 138 F g −1 (63% capacitance retention) at 10 A g −1 . More importantly, the SUFCM electrode demonstrates a robust long‐term stability without capacitance fading after 10,000 cycles. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48388.