| With increasing scarcity of energy resources, tremendous attention has beenfocused on development of sustainable materials to ensure long-term uses. Porouscarbon with diversified micro-textures is widely accepted as a potential candidateincluding gas adsorption, drug delivery, catalysis，electrode materials, mainly due tolightweight properties, excellent chemical inertness, large specific surface area (SSA),high conductivity, etc. Therefore, this thesis attempts to synthesize metal organicframework derived porous carbon, and focus on their applications in supercapacitorelectrode material and catalyst support.ZIF-8(ZIFs, a subclass of MOFs) with zeolite structure is constructed by zincion and2-methylimidazole and with the pore size of0.34nm. It possesses thermalstability, large surface area and high carbon content. In the present study, a facilestrategy is proposed for generating bimodal porosity in porous carbons by using asacrificed metal-organic framework (ZIF-8) as the precursor and additional silicacolloids as extra porogenes via further self-assembly. Details in the formation ofhierarchical structures are studied by time-dependent XRD and TEMcharacterizations. As-synthesized hierarchical porous carbons possess micropores (1.0nm) and mesopores (3-20nm) that are verified by TEM and N2-sorptionmeasurements. Specific information on carbon structures is supplied by XRD andRaman data. Electrochemical properties have been briefly investigated by cyclicvoltammetry and impedance spectroscopy. A highest capacitance of181F g-1andlowest resistance of0.21Ω cm2are obtained between series of ZIF-8derivativecarbons, both of which, along with high electro-stability, show promising applicationsfor these nanoporous carbons in supercapacitors.ZIF-67，each cobalt center is coordinated to four nitrogen atoms of imidazolateligands, thus forming regularly distributed Co-N4moieties within the frameworks.Novel nitrogen-cobalt catalysts have been successfully synthesized via one-steppyrolysis of cobalt-based metal organic framework (ZIF-67) at different temperaturesunder an inert atmosphere. The influence of the carbonization temperature on the porous structure of the nitrogen-cobalt catalysts is comprehensively investigatedthrough XRD, XPS and N2adsorption techniques. Furthermore, the catalyticperformance is investigated for epoxidation of styrene using air as the terminaloxidant. The prepared catalysts exhibit excellent styrene conversion (76.2-91.3%)with better epoxide selectivity (81.3-84.8%) in comparison with neat ZIF-67(39.3%,79.4%). Advantageously, the magnetically recoverable catalysts could be efficientlyreused for5times without noticeable deterioration in activity and selectivity. |
