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RISS 인기검색어
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- 저자 : Motyka, Theodore (검색결과 3 건)
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Influence of synthesis parameters on composition and morphology of electrodeposited Zn-Sb thin films
Dominika Rajska,Kacper Motyka,Marcin Kozieł,Damian Chlebda,Agnieszka Brzózka,Grzegorz D. Sulka 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
The influence of bath concentration, electrodeposition potential, and hydrodynamic conditions in theelectrolytic cell on the morphology, chemical composition, and crystal structure of synthesized Zn, Sb,and Zn-Sb thinfilms was demonstrated based on FE-SEM, EDS, XRD, and Raman measurements. It wasfound that an increase in the working electrode potential leads to the formation of thinfilms with ahigher atomic percentage (at.%) of zinc. Contrary, increasing SbCl3 concentration in the citrate bath andapplication of electrolyte stirring, lead to the preferential electrodeposition of thinfilms containing ahigher content of antimony. From the point of view of thermoelectric applications, the most promisingmaterial was that containing the ZnSb crystal phase with the Zn/Sb atomic ratio of 1. The best results forelectrodeposition of Zn-Sb thinfilms were observed at1.5 V vs. Ag/AgCl (3 M KCl) in the citrate bathcontaining 0.045 M ZnCl2 and 0.045 M SbCl3 in the absence of electrolyte stirring. As a result, anamorphous ZnSb thinfilm with the Zn/Sb atomic ratio of 1.03 was obtained. The sample with acomposition very close to stoichiometric ZnSb was annealed in an inert atmosphere in order to transformit into a crystalline thinfilm.
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Maeda, Tetsuhiko,Nakano, Akihiro,Ito, Hiroshi,Motyka, Theodore,Perez-Berrios, Jose M.,Greenway, Scott The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.2
A Totalized Hydrogen Energy Utilization System (THEUS) is proposed for load leveling and stabilizing the grid. The THEUS is a novel unitized regenerative fuel cell system that achieves high overall efficiency through optimized heat utilization. In this paper, a metal hydride tank (MHT) is chosen as hydrogen storage. In the MHT, the heating and cooling from adsorption/desorption processes is used to produced heated and chilled water for building ventilation systems. A new horizontal type MHT was developed to enhance the recovery rate of the reaction heat. This tank has a double coil heat exchanger and contained 50kg of AB5 metal hydride. The experimental results were compared with the results which were developed previously at AIST. The new tank results showed an improvement for the heat recovery rate which is the ratio of recovered energy to the entire reaction heat of the metal hydride. The reaction heat recovery was improved due to the decrease of the thermal capacity of the tank.
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