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A High‐Performance Supercapacitor Based on KOH Activated 1D C 70 Microstructures
Author(s) -
Zheng Shushu,
Ju Hui,
Lu Xing
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201500871
Subject(s) - supercapacitor , materials science , capacitance , gravimetric analysis , chemical engineering , nanotechnology , capacitive sensing , electrochemistry , horizontal scan rate , pyrolysis , electrode , cyclic voltammetry , organic chemistry , electrical engineering , chemistry , engineering
Fullerenes are of tremendous interest from fundamental researches to applied perspectives in the past decades. However, their application in supercapacitors has been underdeveloped for a long time. Here, the KOH activation of C 70 microtubes is reported at high temperatures, which provides activated samples exhibiting excellent capacitive properties. The improved capacitive performance can be attributed to three aspects: the generation of macropores and micropores, the introduction of oxygen functionalities, and the formation of graphitic carbons from ellipsoidal fullerenes. The optimum activated state for supercapacitor application is achieved at 600 °C, at which the product exhibits the best electrochemical behavior with a gravimetric capacitance of 362.0 F g −1 at 0.1 A g −1 and excellent cycling stability with capacitance retention of 92.5% over 5000 cycles at 1 A g −1 .