Browsing by Author "ALJANABI, Ahmed"
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thesis.listelement.badge DEVELOPMENT OF PLATINUM CONTAINING ELECTROCATALYSTS SUPPORTED ON HYBRID MATERIAL OF PEM FUEL CELL(2023-01-27) ALJANABI, Ahmed; YAMAN, Şeniz Özalp; DEVRİM, YılserIncreasing energy demand in the world has increased the need for alternative energy technologies. Fuel cells using hydrogen, an important alternative energy source, have attracted great interest in recent years. Among the fuel cell types, proton exchange membrane fuel cells (PEMFC) are the most interesting fuel cell type due to their modular structure, high efficiency and low operating temperatures. Particularly, component development studies attract attention to increase the performance of PEMFCs. In this thesis multiwalled carbon nanotube-graphene MWCNT-supported Pt catalysts are synthesized using the microwave-assisted approach to examine the method to investigate the PEMFC performance. MWCNT-supported platinum catalysts were prepared for PEMFC application by using [(NH4)2[Pt2(HPO4)4(H2O)2] (Ptcomplex-1) & [(NH4)2[Pt2(SO4)4(H2O)2] (Ptcomplex-2) complexes as starting materials. TGA, XRD, HR-TEM and XPS analyzes were applied to examine the microstructure and morphology of the catalysts. Among the prepared catalysts Ptcomplex-1/MWCNT-3 and Ptcomplex-2/MWCNT-3 catalysts were tested in PEMFC with H2/air at the range of 60- 80 °C. The maximum power density values were determined for a membrane electrode assembly (MEA) prepared using Ptcomplex-1/MWCNT-3 catalyst as 0.36, 0.39, 0.41, and 0.26 W/cm2 and 0.38, 0.423, 0.44 and 0.28 W/cm2 for Ptcomplex-2/MWCNT-3 catalyst at 60, 65, 70 and 80 ⁰C, respectively. It was determined that the prepared Ptcomplex/MWCNT catalysts showed a better PEMFC performance than that of the Pt/C catalyst. The performance of the catalysts can be further improved with MEA optimization studies to be carried out with the catalysts prepared in the future.