Preparation, Characterization And Application Of Three-dimensional Ordered Macroporous Materials

Over the past years, three-dimensionally ordered macroporous (3DOM) materials, withuniform pore size and well-defined periodic structure, have stimulated much more attentiondue to their potential applications in electrochemistry, catalysis, separation and photoniccrystals, etc.In this work, polystyrene (PS), and polymethyl methacrylate (PMMA) were obtained by thecolloidal crystal templating strategy. Manganese-precursors content with F127、 Mn(NO3)2solution and the phenol-formaldehyde resol.3DOMMnO2/C prepared by a dual‘hard-soft’method. Cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedancespectroscopy techniques are employed to assess the properties of these nanocomposites foruse in supercapacitors. The results demonstrate that MnO2can be effectively utilized withassistance of the3DOM carbon in the electrode. The specific capacitance of thenanocomposite electrode can reach as high as347F g-1at a current density of0.5A g-1.Moreover, the electrode exhibit excellent charge/discharge rate and good cycling stability,retaining over98%of its initial charge after1600cycles at a current density of2.5A g-1.Using Ce(NO3)3·6H2O containing sucrose as the ceria recursor, several3DOM CeO2withhierarchical pore structure were successfully prepared. The results showed that the3DOMCeO2possessed interconnected networks of the ordered macropore structures with largemesopores, and both the pore volume and BET surface area increased significantly comparedwith the familiar3DOM CeO2. The improved performance should be attributed to theemergence of mesopores in the interconnected three-dimensional skeleton. The hierarchical3DOM CeO2exhibited a superior performance to the conventional3DOM or bulk CeO2whenused as supports for Ir catalysts in CO oxidation.