共 80 条
Oxygen-Rich Porous Activated Carbon from Eucalyptus Wood as an Efficient Supercapacitor Electrode
被引:31
作者:

Atika
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Indian Inst Technol Roorkee, Dept Chem, Roorkee 247667, Uttar Pradesh, India Indian Inst Technol Roorkee, Dept Chem, Roorkee 247667, Uttar Pradesh, India

Dutta, Raj Kumar
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Indian Inst Technol Roorkee, Dept Chem, Roorkee 247667, Uttar Pradesh, India
Indian Inst Technol Roorkee, Ctr Nanotechnol, Roorkee 247667, Uttar Pradesh, India Indian Inst Technol Roorkee, Dept Chem, Roorkee 247667, Uttar Pradesh, India
机构:
[1] Indian Inst Technol Roorkee, Dept Chem, Roorkee 247667, Uttar Pradesh, India
[2] Indian Inst Technol Roorkee, Ctr Nanotechnol, Roorkee 247667, Uttar Pradesh, India
关键词:
electric double-layer capacitances;
eucalyptus wood;
oxygen-rich activated carbon;
supercapacitors;
symmetric device fabrication;
HIGH-PERFORMANCE SUPERCAPACITORS;
ELECTROCHEMICAL PERFORMANCE;
NANOPOROUS CARBONS;
FUNCTIONAL-GROUPS;
FACILE SYNTHESIS;
NITROGEN;
STORAGE;
LIGNIN;
MORPHOLOGY;
PYROLYSIS;
D O I:
10.1002/ente.202100463
中图分类号:
TE [石油、天然气工业];
TK [能源与动力工程];
学科分类号:
0807 ;
0820 ;
摘要:
Herein, lignin-rich KOH-activated porous carbon from eucalyptus wood (named as PACE) is presented as an efficient electrode for supercapacitors (SCs). Compared with the most commonly used higher activation temperature, i.e., 800 degrees C with KOH (PACE-800), a more efficient SC is developed by activating carbon with KOH at lesser temperature, i.e., 600 degrees C (PACE-600). The high specific capacitance (i.e., 230 F g(-1) at 1 A g(-1) measured in a 2 m NaCl electrolyte) measured by galvanostatic charge-discharge (GCD) studies is not primarily due to larger surface area, but due to the inherent electron-rich oxygen-based functionalities that persist at the lower activation temperature, contributing to the hydrophilic nature to PACE-600. The mechanism of the capacitive charge storage is deduced from electrochemical impedance spectroscopy (EIS). The application of PACE-600 as a SC electrode is confirmed from insignificant loss in the specific capacitance after 10 000 charging-discharging cycles, recorded at 10 A g(-1). Further, fabrication of higher-voltage (1.6 V) symmetric SC PACE-600//PACE-600 in aqueous neutral electrolyte (2 m NaCl) is presented, which illuminates a red LED (1.8 V) for 1 min after charging for 5 s. The corresponding energy density is calculated to be 41 W h kg(-1), and at a power density of 2396 W kg(-1).
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