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Bui, Hoa Thi,Shrestha, Nabeen K.,Khadtare, Shubhangi,Bathula, Chinna D.,Giebeler, Lars,Noh, Yong-Young,Han, Sung-Hwan American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.21
<P>One of the challenges in obtaining hydrogen economically by electrochemical water splitting is to identify and substitute cost-effective earth-abundant materials for the traditionally used precious-metal-based water-splitting electrocatalysts. Herein, we report the electrochemical formation of a thin film of nickel-based Prussian blue analogue hexacyanoferrate (Ni-HCF) through the anodization of a nickel substrate in ferricyanide electrolyte. As compared to the traditionally used Nafion-binder-based bulk film, the anodically obtained binder-free Ni-HCF film demonstrates superior performance in the electrochemical hydrogen evolution reaction (HER), which is highly competitive with that shown by a Pt-plate electrode. The HER onset and the benchmark cathodic current density of 10 mA cm(-2) were achieved at small overpotentials of 15 mV and 0.2 V (not iR-corrected), respectively, in 1 M KOH electrolyte, together with the long-term electrochemical durability of the film. Further, a metal-HCF-electrode-based full water-splitting device consisting of the binder-free Ni-HCF film on a Ni plate and a one-dimensional Co-HCF film on carbon paper as the electrodes for the HER and the oxygen evolution reaction (OER), respectively, was designed and was found to demonstrate very promising performance for overall water splitting.</P>
Hufenbach, J.,Helth, A.,Lee, M.H.,Wendrock, H.,Giebeler, L.,Choe, C.Y.,Kim, K.H.,Kuhn, U.,Kim, T.S.,Eckert, J. Elsevier Sequoia 2016 Materials science & engineering. properties, micro Vol.674 No.-
<P>This work presents an investigation on the influence of rare earth additions (Ce) on the microstructure and mechanical properties of a cast Fe85Cr4Mo8V2C1 (element contents in wt%) tool steel. The applied relatively high solidification rate during the casting process promotes the formation of non-equilibrium phases such as martensite, retained austenite as well as a fine network-like structure of complex carbides. This combination of phases and their morphology results in excellent mechanical properties already in the as-cast state. Cerium additions induce a change in phase formation and resulting mechanical properties. Besides morphological and quantitative changes of the main constituent phases, novel carbo-oxide and carbide phases are formed. To investigate this microstructural phenomenon, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) combined with energy dispersive X-ray spectroscopy (EDX) were applied. Altogether, the addition of small amounts of the rare earth element cerium together with a tailored casting process results in enhanced mechanical properties compared to the Fe85Cr4Mo8V2C1 alloy and offers new possibilities to obtain high-strength and simultaneously adequate ductile cast steels for advanced tool design. (C) 2016 Elsevier B.V. All rights reserved.</P>
Ahn, Do Young,Lee, Deok Yeon,Shin, Chan Yong,Bui, Hoa Thi,Shrestha, Nabeen K.,Giebeler, Lars,Noh, Yong-Young,Han, Sung-Hwan American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.15
<P>This work reports on designing of first successful MOFsensitizer based solid-state photovoltaic device, perticularly with a meaningful output power conversion efficiency. In this study, an intrinsically conductive cobalt-based MOFs (Co-DAPV) formed by the coordination between Co (II) ions and a redox active di(3-diaminopropyl)-viologen (i.e., DAPV) ligand is investigated as sensitizer. Hall-effect measurement shows p-type conductivity of the Co-DAPV film with hole mobility of 0.017 cm(2) V-1 s(-1), suggesting its potential application as hole transporting sensitizer. Further, the energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of Co-DAPV are well-matched to be suitably employed for sensitizing TiO2. Thus, by layer-by-layer deposition of hole conducting MOF-sensitizer onto mesoporous TiO2 film, a power conversion efficiency of as high as 2.1% is achieved, which exceeds the highest efficiency values of MOF-sensitized liquid-junction solar cells reported so far.</P>
Material Cost Model for Innovative Li-Ion Battery Cells in Electric Vehicle Applications
Ralf Petri,Tobias Giebel,Bin Zhang,Jan-Hinnerk Schünemann,Christoph Herrmann 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.2 No.3
Due to global warming and the rise of the CO2 emissions electric mobility is in the focus. In this case costs for li-ion batteries and especially the material costs are the main cost drivers for electric vehicles. The aim of this paper is to develop a material cost model which can evaluate cell chemistry alternatives for li-ion battery anodes and cathodes. A focus is set on innovative cell chemistries which currently are not using in mass production. The presented model is based on bottom-up approach which can calculate costs and cell performance together to determine the ratio of material cost and energy. The general results are complemented with a case study that assesses that active material with a high specific energy can help reducing the material costs and improves cell performance parameters.