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이대욱,노영수,사바리아룰,김태환,김형국,배용진,김진영 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2
Hierarchically porous Cu-doped ZnO nanostructures were formed on indium-tin-oxide (ITO)-coated glass substrates by using a template-free electrochemical deposition method. Field-emission scanning electron microscopy images showed that the density of the Cu-doped ZnO porous nanostructures increased with increasing Cu concentration. X-ray diffraction patterns showed that the lattice spacing of the (002) plane for the Cu-doped ZnO porous nanostructures decreased with increasing Cu concentration. Photoluminescence spectra for the Cu-doped ZnO porous nanostructures formed on the ITO-coated glass substrates showed that the dominant emission peak related to the band-to-band transitions shifted to a higher wavelength side with increasing Cu concentration.
Fang, B.,Bonakdarpour, A.,Kim, M.S.,Kim, J.H.,Wilkinson, D.P.,Yu, J.S. Elsevier 2013 Microporous and mesoporous materials Vol.182 No.-
A simple sol-gel synthesis strategy is developed to fabricate multimodal porous carbon (MPC) with hierarchical nanoarchitectures, in which monodisperse polystyrene sulfonate (PSS) spheres self-assemble themselves into an ordered lattice while the meso-sized silica particles generated in situ through base-catalyzed hydrolysis of tetraethyl orthosilicate aggregate closely at the interstices between the PSS spheres. Removal of the PSS lattice by calcination leaves a three-dimensional interconnected ordered macroporous structure, the walls of which are composed of a templated aggregate of the small silica particles, leading to a bimodal porous silica (BPS) template with open mesopores at the interstices between the small silica particles. This synthesis route allows one to readily fabricate BPS with a tailored three-dimensional ordered nanostructure, which can be further converted to MPC through the inverse replication. The MPC not only possesses ultrahigh surface area (i.e., 2220m<SUP>2</SUP>/g), but also a unique hierarchical porosities composed of macro-, meso-, and micropores, which enable MPC to store and release large electrical charges rapidly whether at a low-mid or high rate. The well-developed 3D interconnected ordered macropore framework with open mesopores embedded in the macropore walls favors fast mass transport at high charge/discharge rates, providing better electric double layer capacitor performance. Compared with commonly used electrode material carbon black Pearls 2000 and other nanostructured carbons such as CMK-1 and CMK-3, the MPC has demonstrated much higher specific capacitance and energy.