Synthesis of zeolitic imidazolate framework-67 nanocube wrapped by graphene oxide and its application for supercapacitors
- 368 Downloads
In this study, a nanocube of zeolitic imidazolate framework-67 (ZIF-67) was prepared by blending cobalt nitrate hexahydrate and 2-methylimidazole together in aqueous solutions containing hexadecyltrimethylammonium bromide (CTAB). Then, grapheme oxide (GO) wrapped ZIF-67 nanocomposites (ZIF-67/GO-n) were prepared by one-pot stirring method at room temperature. The morphology and microstructure of ZIF-67 and its GO nanocomposites were investigated by Raman spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) specific surface area analysis. Electrochemical capacitance properties of all samples were characterized by cyclic voltammetry and chronopotentiometry, respectively. The results demonstrated that the content of GO used during synthesis process affected the specific capacity of nanocomposites while they were constructed as supercapacitor electrode. Compared with pure GO and ZIF-67 nanocubes, ZIF-67/GO-n composites had better specific capacitance. While the concentration of GO was 2 wt% based on their initial total mass of two reactants, ZIF-67/GO-2 composite presents a specific capacitance of 100.41 F g−1 at a sweep rate of 5 mV s−1. The good electrochemical performance of ZIF-67/GO-n composite may be credited to large BET surface area of ZIF-67 nanocubes and good conductivity of GO, and thus is expected to become a potential electrode material for supercapacitors.
KeywordsZIF-67 Graphene oxide Composite Electrode materials Supercapacitor
This work was financially supported by the Open Foundation of Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education (No.JDGD-2016008), the Open Foundation of Hubei Key Laboratory of Industrial Fume & Dust Pollution Control (No.HBIK2016-01) and the National Training Programs of Innovation and Entrepreneurship for undergraduates (No.2017zd041).
- 11.Wang L, Han YZ, Feng X, Zhou JW, Qi PF, Wang B (2016) Metal–organic frameworks for energy storage: batteries and supercapacitors, coordination. Chem Rev 307:361–381Google Scholar
- 12.Qu C, Jiao Y, Zhao BT, Chen DC, Zou RQ, Walton KS, Liu ML (2016) Nickel-based pillared MOFs for high-performance supercapacitors: design, synthesis and stability study. Nano Energy 26:66–73Google Scholar