Uhm S.,Institute for Advanced Engineering |
Kim Y.D.,Sungkyunkwan University
Current Applied Physics | Year: 2014
Carbon dioxide is one of the greatest concerns worldwide, since it is not only a major greenhouse gas but also expected to be an important, sustainable resource for fuels and chemicals. The electrochemical conversion of carbon dioxide, based on solid electrolyte membrane reactors, has the promise to overcome the limitations of the conventional catalytic reactors such as the limited conversion and kinetics, relatively low selectivity and high energy consumption. In this review, electrocatalysts and solid oxide electrolytes, both proton and oxide ion conductors as core materials in an electrochemical ceramic membrane reactor have been reviewed and particular emphasis is placed on their application to synthesize carbon monoxide and hydrogen. © 2014 Elsevier B.V. All rights reserved.
Kim M.J.,Institute for Advanced Engineering |
Lee D.B.,Sungkyunkwan University
Metals and Materials International | Year: 2013
Fe-(4.8, 9.2, 14.3)wt%Al alloys were corroded at 700 and 800 C for up to 70 h in 1 atm of N2/H2O and N2/H 2O/H2S gases. Oxidation prevailed in N2/H 2O gases. Fe-(4.8, 9.2)Al alloys formed a duplex scale that consisted of an outer iron oxide layer and an inner (Fe, Al, O)-mixed layer. The Fe-14.3Al alloy formed a thin layer consisting of α-Al2O 3. Sulfidation dominated in N2/H2O/H 2S gases, resulting in rapid corrosion. Fe-(4.8, 9.2)Al alloys formed a duplex scale that consisted of an outer FeS layer and an inner (Fe, Al, S, O)-mixed layer. The high growth rate of FeS impeded the formation of a continuous, protective aluminium-rich oxide. The Fe-14.3Al alloy formed a thin layer consisting of α-Al2O3 that was incorporated with a bit of sulfur. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.
Lee J.S.,Yeungnam University |
Han G.B.,Institute for Advanced Engineering |
Kang M.,Yeungnam University
Energy | Year: 2012
This study investigated the application of a new metal catalytic species, Sn ion, rather than conventional Ni-based catalyst, to hydrogen production from ESR (ethanol steam reforming). Mesoporous SBA-15 catalysts with various contents of incorporated Sn (Sn-SBA-15) exhibited significantly higher ESR reactivity and the highest reactivity was achieved with 20 mol% Sn-SBA-15 catalysts: the H 2 production and ethanol conversion were maximized at 75% and 92%, respectively, at a mild temperature of 500 °C for 1 h at a CH 3CH 2OH:H 2O ratio of 1:1 and a GHSV (gas hourly space velocity) of 6600 h -1. The XRD (X-ray diffraction) and XPS (X-ray photoelectron spectroscopy) results indicated that the incorporated Sn species, SnO 2/Sn, was simultaneously transferred to Sn/SnO 2 by alternating their redox reactions and that the reactivity of the Sn-based activity could be long-lasting. © 2012 Elsevier Ltd.
Lee Y.-I.,Hanyang University |
Kim S.,Hanyang University |
Lee K.-J.,Institute for Advanced Engineering |
Myung N.V.,University of California at Riverside |
Choa Y.-H.,Hanyang University
Thin Solid Films | Year: 2013
Water-based single-walled carbon nanotube (SWCNT) inks with excellent dispersibility for inkjet printed transparent conductive films were prepared by a simple and versatile UV/ozone treatment. The dispersion stability of the SWCNTs was enhanced by the increased oxygen-containing groups on the SWCNT surfaces which were created by the UV/ozone treatment. After inkjet printing of the ink to obtain transparent conductive patterns, circular rings in which most of the SWCNTs are concentrated at the rim were formed by coffee ring effect. The transparent conducting films were achieved by connecting and stacking the rings; the final films inkjet printed in 40 layers have a sheet resistance of 870 Ω sq- 1 at 80% optical transmittance in the wavelength of 550 nm. © 2013 Elsevier B.V. All Rights Reserved.
Institute For Advanced Engineering | Date: 2012-10-17
Disclose is a method for preparing a cathode material for a lithium secondary battery, the method comprising the steps of: preparing an amorphous silicon oxide; using the prepared silicon oxide as a starting material; and milling the amorphous silicon oxide, a lithium silicon oxide and a transition metal silicon oxide at a predetermined ratio, drying the milled material, and heat-treating the dried material in an atmosphere of inert gas, thereby preparing a lithium transition metal silicon oxide.