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P-996 : Hydrogen storage in Li inserted Alumina nanotube
강경연,이창훈,이재성 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Soaring oil price everyday instigates human to develop a new alternative energy. Hydrogen energy is focused on the most feasible energy for future due to no emission of pollutants, high efficiency and infinitive amount. But hydrogen has very low density and low explosion energy so that it is difficult to store in high-pressure tank like any other gas. The hydrogen plan of Department of Energy of the United States (DOE) requires system weight efficiency of 6.5wt% and volumetric density of 62kg H2/m3. This study is to develop the materials to store hydrogen for meeting the goals of DOE. We used Li inserted Postech Alumina Nanotube (Li-PANT). Li-PANT is synthesized by adding controlled amount of water in the mixture of Aluminum tri-sec butoxide as alumina precursor and Cetytrimethylammonium bromide(CTMABr) as structure template adding LiOH in-situ. And the stored amount of hydrogen in Li-PANT is measured as increasing pressure up to 40 bar step by step at constant temperature (RT, 200°C) with volumetric adsorption/Desorption apparatus (Sieverts’ apparatus from Hy-energy LLC).
Preparation and Characterization of Nafion / HSO3-MMT Composite Membranes for DMFC
이창훈,강경연,김혜경,장혁,이재성 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Fuel cells convert the chemical energy into electrical energy with higher efficiency and low emission of pollutants than internal combustion engines. Among of them, DMFCs are suited for portabledevices or transportation applications owing to their high power density and low operating temperature. But, DMFCs have major technical problems, e.g. slow oxidation kinetics of methanol and high methanol crossover from the anode to the cathode. In the present study, for minimizing the lowering of ionic conductivity caused by adding the inorganics as well as reducing the methanol permeability, we employed the functionalized inorganic oxide by modifying its surface with sulfonicacid group as a composite electrolyte membrane for DMFC. The sulfonic acid functionalized Montmorillonite(HSO3-MMT) has been synthesized, and then the composite polymer membrane based upon Nafion was casted. The electrochemical activity in DMFC was accomplished with single cell, operated at various temperature with a MeOH/Air as fuels. The composite membranes exhibited the excellent fuel efficiency by reducing the methanol crossover and better performances than Nafion115.
이창훈,( Joshi Upendra Anant ),강경연,이재성 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Recent efforts in the field of nanostructured materials have been mostly focused on fabricating onedimensional (1-D) nanowires, rods, or tubes. The synthesis of a material with a well-defined nanoscale cavity is under most currently intensive investigationbecause of their unique physical properties and wide-range applications in diverse area. In this current study, titania nanostructured materials have been synthesized by hydrothermal treatment of titanium oxysulfate in aqueous nonsurfactant solution. This process is more convenient than template methods in which special templates are required which then have to be removed. And titanium oxysulfate is the intermediate product in TiO2 manufacturing processes, and so using titanium oxysulfate is lower cost route than using a crystalline titania or titanium alkoxides as making a titania nanotube by hydrothermal method. In addition, the products made by hydrothermal methods without surfactants can prepare the nanotubes with thin walls thickness and small diameters. As-synthesized titania nanomaterials have a large surface area, and so directly usable because of no template in its core. This low-cost simple synthetic method may be applied in the fabrication of some other oxide nanostructured materials.