TY - JOUR
T1 - Hierarchical Carbon Composites for High-Energy/Power-Density and High-Reliability Supercapacitors with Low Aging Rate
AU - Chen, Cheng Chia
AU - Kirana, Nindita
AU - Puspita, Daniel Fajar
AU - Patra, Jagabandhu
AU - Hsieh, Chien Te
AU - Gandomi, Yasser Ashraf
AU - Lai, Hong Zheng
AU - Chang, Tseng Lung
AU - Tseng, Chung Jen
AU - Majumder, Subhasish Basu
AU - Wang, Cheng Yu
AU - Chang, Jeng Kuei
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/5/20
Y1 - 2022/5/20
N2 - A facile method for preparing hierarchical carbon composites that contain activated carbon (AC), carbon nanospheres (CNSs), and carbon nanotubes (CNTs) for use as the electrode material in supercapacitors (SCs) was developed. The CNS/CNT network enabled the formation of three-dimensional conducting pathways within the highly porous AC matrix, effectively reducing the internal resistance of an SC electrode. The specific capacitance, cyclability, voltage window, temperature profile during charging/discharging, leakage current, gas evolution, and self-discharge of the fabricated SCs were systematically investigated and the optimal CNS/CNT ratio was determined. A 2.5 V floating aging test at 70 °C was performed on SCs made with various hierarchical carbon electrodes. Electrochemical impedance spectroscopy, postmortem electron microscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses were conducted to examine the electrode aging behavior. A hierarchical carbon architecture with an appropriate AC/CNS/CNT constituent ratio could significantly improve charge-discharge performance, increase cell reliability, and decrease the aging-related degradation rate.
AB - A facile method for preparing hierarchical carbon composites that contain activated carbon (AC), carbon nanospheres (CNSs), and carbon nanotubes (CNTs) for use as the electrode material in supercapacitors (SCs) was developed. The CNS/CNT network enabled the formation of three-dimensional conducting pathways within the highly porous AC matrix, effectively reducing the internal resistance of an SC electrode. The specific capacitance, cyclability, voltage window, temperature profile during charging/discharging, leakage current, gas evolution, and self-discharge of the fabricated SCs were systematically investigated and the optimal CNS/CNT ratio was determined. A 2.5 V floating aging test at 70 °C was performed on SCs made with various hierarchical carbon electrodes. Electrochemical impedance spectroscopy, postmortem electron microscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses were conducted to examine the electrode aging behavior. A hierarchical carbon architecture with an appropriate AC/CNS/CNT constituent ratio could significantly improve charge-discharge performance, increase cell reliability, and decrease the aging-related degradation rate.
KW - carbon nanospheres
KW - carbon nanotubes
KW - cell aging
KW - gas evolution
KW - self-discharge
KW - temperature variation
UR - http://www.scopus.com/inward/record.url?scp=85127822112&partnerID=8YFLogxK
U2 - 10.1002/cssc.202200345
DO - 10.1002/cssc.202200345
M3 - Article
C2 - 35293144
AN - SCOPUS:85127822112
SN - 1864-5631
VL - 15
JO - ChemSusChem
JF - ChemSusChem
IS - 10
M1 - e202200345
ER -