title: Rational design of Ni nanoparticles on N-rich ultrathin carbon nanosheets for high-performance supercapacitor materials: embedded- versus anchored-type dispersion.
abstract: 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.
authors.affiliation: Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Institute of New Energy Material Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071 (P.R. China).
authors.forename: Mei
authors.initials: M
authors.lastname: Yang
authors.forename: Yiren
authors.initials: Y
authors.lastname: Zhong
authors.forename: Liwei
authors.initials: L
authors.lastname: Su
authors.forename: Jinping
authors.initials: J
authors.lastname: Wei
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhou
keywords: nanoparticles; nanosheets; nickel; nitrogen; sol-gel processes