Abstract: Nanocomposites consisting of zeolitic imidazolate framework nanocrystals on graphene oxide (ZIF/GO) are prepared by a facile ultrasonic method under ambient conditions. Brunauer–Emmett–Teller specific surface area measurements show that surface areas of the graphene composites are greatly increased by the addition of the ZIF component. Electrochemical properties of the nanocrystal-modified electrodes are measured by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy in 6 M KOH electrolyte. Nanocomposites of ZIF-8/GO and ZIF-67/GO exhibit high specific capacitance values up to 400 and 252 F g−1, respectively, much higher than that of each ZIF by itself. In addition to the good pseudocapacitive behavior, they exhibit excellent cycling performance, indicating that the ZIF nanoparticles grown on the surface of GO are beneficial to improving electrochemical properties. Graphical Abstract: The ZIF nanocrystals grown on the surface of GO were beneficial to improving the electrochemical performance of the electrode materials.[Figure not available: see fulltext.]
Bibliographical noteFunding Information:
A part of this work was supported by the Shanghai Municipal Education Commission (High-energy Beam Intelligent Processing and Green Manufacturing). A part of this work was supported by the University of Minnesota Initiative for Renewable Energy and the Environment (IREE). Parts of this work were carried out in the Characterization Facility, University of Minnesota, which receives partial support from the NSF through the MRSEC program.
© 2016, Springer Science+Business Media Dordrecht.
- Graphene oxide
- Metal–organic framework (MOF)
- Zeolitic imidazolate framework (ZIF)