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Rational Design of Ni Nanoparticles on N‐Rich Ultrathin Carbon Nanosheets for High‐Performance Supercapacitor Materials: Embedded‐ Versus Anchored‐Type Dispersion
Author(s) -
Yang Mei,
Zhong Yiren,
Su Liwei,
Wei Jinping,
Zhou Zhen
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201304805
Subject(s) - supercapacitor , pseudocapacitance , materials science , capacitance , nanoparticle , dispersion (optics) , composite number , chemical engineering , electrochemistry , cathode , carbon fibers , nanotechnology , energy storage , composite material , power (physics) , chemistry , electrode , physics , engineering , quantum mechanics , optics
Highly dispersed Ni nanoparticles (NPs) and abundant functional N‐species were integrated into ultrathin carbon nanosheets by using a facile and economical sol–gel route. Embedded‐ and anchored‐type configurations were achieved for the dispersion of Ni NPs in/on N‐rich carbon nanosheets. The anchored‐type composite exhibited outstanding pseudocapacitance of 2200 F g −1 at 5 A g −1 with unusual rate capability and extraordinary cyclic stability over 20 000 cycles with little capacitance decay. Aqueous asymmetric supercapacitors fabricated with this composite cathode demonstrated a high energy density of 51.3 Wh kg −1 at a relatively large power density of 421.6 W kg −1 , along with outstanding cyclic stability. This approach opens an attractive direction for enhancing the electrochemical performances of metal‐based supercapacitors and can be generalized to design high‐performance energy‐storage devices.