Browsing by Author "Al-Msrhad, Tuqa Majeed Hameed"
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thesis.listelement.badge INVESTIGATION OF HYDROGEN PRODUCTION FROM SODIUM BOROHYDRIDE HYDROLYSIS WITH SUPPORTED METAL CATALYST(2022-01-14) Al-Msrhad, Tuqa Majeed Hameed; Devrim, YılserIn recent years, the decrease in fossil fuel resources and the increase in environmental pollution has increased the interest in alternative energy sources. Among alternative energy sources, Hydrogen (H2) energy is of great importance due to its high energy density. The most important benefit in using H2 energy isthe clean and easy production and storage. When H2 production methods are examined, sodium borohydride (NaBH4) based H2 production is of great significance, and the particular reason for this circumstance is that it is renewable, reliable, and efficient and can easily be integrated into proton exchange membrane fuel cells (PEMFC). In this thesis, Palladium-Ruthenium (Pd:Ru) bimetallic catalyst supported on Multi walled Carbon Nanotubes (MWCNT) and Multiwall Carbon Nanotube Doped Gra phene Nanoplatelets (MWCNT-GNP) has been developed for H2 production from hy drolysis of NaBH4 for PEMFC application. These catalysts were synthesized by the microwave assisted synthesis approach. The prepared catalysts were characterized by Thermogravimetric Analysis (TGA), X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and cyclic voltammetry analysis (CV). The electrochemical sur face area (ECSA) of the PdRu/MWCNT and PdRu/MWCNT-GNP catalysts were determined as 12.36 m2 /g and 20.74 m2 /g, respectively. PdRu/MWCNT showed a faintly lower ECSA loss as 34%. iv The catalysts were tested to investigate the H2 production from the chemical hydrolysis of NaBH4. Hydrolysis reactions were examined under various experimental condi tions. Kinetic studies were executed for PdRu/MWCNT and PdRu/MWCNT-GNP, and the activation energies were found as 18.90 kJ/mol and 22.33 kJ/mol, respectively. The reusability experiments with PdRu/MWCNT-GNP revealed that GDL supported catalysts maintained its 89 % efficiency better than the powder catalyst. The PEMFC test performed at 65oC showed that the H2 generation system based on solid NaBH4 hydrolysis and pure H2 have similar performance. The obtained results showed that the PdRu/MWCNT-GNP bimetallic catalyst is an appropriate catalyst to produce H2 from hydrolysis of NaBH4 for PEMFC application.