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    Development of a power management unit for small portable direct borohydride fuel cell-NiMH battery hybrid system
    (Pergamon-Elsevier Science Ltd, 2012) Sanli, Ayse Elif; Gunlu, Goksel; Aytac, Aylin; Mat, Mahmut
    In this study, a small portable fuel cell/battery hybrid system has been developed. The system consists of a single portable direct borohydride/peroxide fuel cell (DBPFC), NiMH battery and power management unit (PMU). The battery has been used as a primary power source and has been discharged at constant load. When its state of charge is reduced, the DBPFC charges the battery and powers the load simultaneously. A DC-DC Boost converter has been used as a PMU. The DBPFC has provided the total power of 0.21 Wh into the system during the charge. During this experimental study fuel (NaBH4) efficiency of 37% has been achieved in the hybrid system, while the system efficiency has been calculated as 34.5%. Copyright (C) 2012, 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 by cyclic voltammetry on molybdenum (II)
    (Pergamon-Elsevier Science Ltd, 2014) Sanli, Ayse Elif; Aytac, Aylin; Mat, Mahmut
    The electro-oxidation of H2S in Black Sea water to generate electricity was investigated. MoS2 exhibited catalytic activity toward the oxidation of H2S in artificial sea water. The catalytic activity of molybdenum sulfide was found to depend on the electrolyte pH and on the temperature. Cyclic voltammograms taken in the artificial sea water containing hydrogen sulfide at pH = 14 exhibited a peak at 500 mV related to the oxidation of HS-. Furthermore, the peak current of the MoS2 electrode increased to 400 mA g(-1) from 250 mA g(-1) (approximately 1.6-fold) when the temperature was increased from 353 K to 363 K. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.