Yazar "Mat, Mahmut D." seçeneğine göre listele

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    A borohydride/peroxide fuel cell-Li-ion battery hybrid system controlled with a maximum peak power tracking algorithm
    (Pergamon-Elsevier Science Ltd, 2015) Yilmaz, Eyup; Canan, Belkis; Sanli, Ayse Elif; Mat, Mahmut D.; Gunlu, Goksel
    The present study was carried out to develop a direct borohydride/peroxide fuel cell (DBPFC)/Li-ion battery hybrid system. In the system, the battery was charged with DBPFC. The output power of the DBPFC was controlled by a MPPT algorithm. It consists of two main parts: a DC/DC converter and a DSP controller. TMS320F28027 DSP was used to manage the entire MPPT circuit. The DC/DC controller was placed between the fuel cell and the battery. The performance test results indicated that the output power remained constant at 1.3 W during the test. Moreover, the voltage ripples that are generally observed in the fuel cells were prevented. The fuel cell provided the power at the maximum peak power for approximately 211 min. It was obvious that the Li-Ion battery was charged with a stable DBPFC power. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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    Investigation of the electro-oxidation of artificial Black Sea water using cyclic voltammetry on metal sulfide electrodes (I)
    (Pergamon-Elsevier Science Ltd, 2014) Sanli, Ayse Elif; Yilmaz, Orhan; Aytac, Aylin; Mat, Mahmut D.
    Black Seawater is an alternative hydrogen source because it has hydrogen sulfide content. Seawater electrolysis is a promising method to produce hydrogen. The anodic oxidation of hydrogen sulfide is a novel approach for directly generating electricity via fuel cells. Therefore, four materials (Cu, Stainless Steel 304 (SS), V2O5 and Ni) were examined in artificial seawater containing hydrogen sulfide (HS-). We developed active metal sulfide electrodes for oxidizing HS-. Alongside the corrosion potentials, the progression of the oxidation and reduction reactions was obtained by the cyclic voltammetry method. The active behaviors of the metal sulfide (MSx) layers were determined by applying Electrochemical Impedance Spectroscopy (EIS). Although the Cu2S electrode acts as the active catalyst during HS- ion oxidation, NiS is the most suitable metal sulfide because it exhibits a higher corrosion resistance than Cu2S. While V2O5 demonstrates catalytic activity at high temperatures (>= 30 degrees C), FeS layers corrode easily in the artificial seawater environment. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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    Performance analysis of direct Black Sea hydrogen sulphide (in artificial sea water)/hydrogen peroxide fuel cells
    (Pergamon-Elsevier Science Ltd, 2015) Sanli, Ayse Elif; Mat, Mahmut D.
    This study aims to analyse fuel cells constructed with the artificial Black Sea water containing hydrogen sulphide (H2S) as fuel. A parametric analysis of the performance of the direct H2S/H2O2 fuel cells is conducted to investigate the effect of certain parameters on the cells operation. The effects of the concentration of anolyte and catholyte and the pH of the anolyte are investigated. Increasing the solution pH leads to increased HS- concentration of the anolyte, resulting in higher cell power. The concentration of H2O2 has a greater impact on the cell's power density than the other parameters investigated. In the present study, the fuel cell can yield a power density of 23 mW cm(-2) at a cell voltage of 300 mV and current density of 75 mA cm(-2). Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.