Mesoporous Co 3 O 4 nanoparticles with different textural parameters were prepared by using mesoporous silicas, KIT-6 and SBA-15, as templates and Co(NO 3 ) 2 • 6H 2 O as precursor via an improved solid-liquid route. The results of N 2 adsorption-desorption analysis indicated that the calcination temperature did not obviously affect the textural parameters of Co 3 O 4 samples and the BET surface areas of Co 3 O 4 samples could be regulated by different KIT-6 templates. The effects of calcination temperature and textural parameters on the electrochemical capacitive behaviors of Co 3 O 4 samples were discussed. The results of electrochemical tests show the following: the capacitance value of the sample decreases slightly with the increase of the calcination temperature; the BET surface area is the crucial factor for the specific capacitance value; for mesoporous materials, large pore size and high ordering degree of mesopore facilitate ion transfer; and the meso-structure (2D hexagonal structure or 3D Ia3d cubic structure) of mesoporous Co 3 O 4 nanoparticles does not obviously affect the specific capacitance value of the samples, but 2D hexagonal mesoporous structure is more advantageous to ion transfer than 3D Ia3d cubic mesoporous structure.
Three-dimensional cubic ordered mesoporous carbons with tunable pore sizes have been synthesized by using cubic Ia3d mesoporous KIT-6 silica as the hard template and boric acid as the pore expanding agent. The prepared ordered mesoporous carbons were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption analysis. The results show that the pore sizes of the prepared ordered mesoporous carbons with three-dimensional cubic structure can be regulated in the range of 3.9–9.4 nm. A simplified model was proposed to analyze the tailored pore sizes of the prepared ordered mesoporous carbons on the basis of the structural parameters of the silica template.
Mesoporous silica nanofibers were synthesized within the pores of the anodic aluminum oxide template using a simple sol–gel method. Transmission electron microscopy investigation indicated that the concentration of the structure-directing agent (EO20PO70EO20) had a significant impact on the mesostructure of mesoporous silica nanofibers. Samples with alignment of nanochannels along the axis of mesoporous silica nanofibers could be formed under the P123 concentration of 0.15 mg/mL. When the P123 concentration increased to 0.3 mg/mL, samples with a circular lamellar mesostructure could be obtained. The mechanism for the effect of the P123 concentration on the mesostructure of mesoporous silica nanofibres was proposed and discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.