Document Details

Document Type : Thesis 
Document Title :
Integrated Hydrogen and Renewable Resources for High Efficiency Energy Generation
دمج الهيدروجين مع الموارد المتجددة لتحقيق كفاءة عالية في توليد الطاقة
 
Subject : Faculty of Science 
Document Language : Arabic 
Abstract : Despite the element hydrogen is hopefully and highly expected to play a crucial role as a future energy carrier, no secure and efficient technology is satisfied yet for both hydrogen storage to use on mobile applications or vehicles, and transportation. Storage of hydrogen includes compressed hydrogen gas/liquid, metal hydrides, porous media, and chemical hydrogen storage. All these methods of hydrogen storage have both common and differing issues. For compressed gas and liquid tanks, volume, safety, and cost are the major issues. While volumetric capacity and working temperature are the main issues for porous media. For metal hydrides, which show high storage capacity in weight-to-volume ratio still charge and discharge kinetics is the primary obstacle. The conclusion is that no known material meets all requirements. Therefore, through this thesis some new nanostructure materials were investigated for determine their capabilities of hydrogen storage. A nano-porous glassy Zr60Al5Ni30Pd5 skeleton structure alloy was prepared by electrochemical etching treatment in its glassy phase. The nano-pore size is about 5-15 nm and no nano-phase aggregation phenomenon is recognized. The alloy composition of the nano-porous surface shifted to Zr21.8Al2.4Ni56.1Pd19.7 and the electrochemical treatment caused the enrichment of Ni and Pd elements on the nano-porous surface. The enrichment of Ni and Pd elements leads to the increases of the reaction activity with hydrogen and its reaction duration time and the improvement is due to Pd catalytic effect through creating diffusion pathway into the bulk of material. The nano-porous glassy alloy has homogeneous distribution of Pd element and exhibits high corrosion resistance. The hydrogen absorption/desorption characteristics with high hydrogenation-dehydrogenation kinetics are maintained without appreciable degradation up to at least 20 cycles and the hydrogen absorption capacity reaches about 5.4 wt%. This result indicates the possibility of developing a suitable hydrogen storage material which can reduce the consumption amount of precious Pd metals. We also describe a graphene and fibrous multiwall carbon nanotubes (f-MWCNT) composite film prepared by plasma enhance chemical vapor deposition for use as a suitable and possible candidate of hydrogen storage materials. High storage capacity of 5.53 wt% has been obtained with improved kinetics. The addition of binary PdMg alloy nanoparticles to the surface of graphene-fibrous nanotubes composite films raised the storage capacity by 53% in comparison to the film without PdMg decorated nanoparticles. Additionally, the graphene/f-MWCNT composite film decorated PdMg nanoparticles exhibited an enhanced hydrogen absorption-desorption kinetics. The fibrous structure of the MWCNTs alongside the presence of graphene sheets within the film create an enormous active region sites for hydrogen reaction. The addition of PdMg nanoparticles enhanced the reaction kinetics due to the catalytic nature of Pd and increased the hydrogen content due to the high absorption capacity of Mg nanoparticles. The combination of both Pd and Mg in a binary alloy nanoparticle enhanced the hydrogen capacity as well as absorption-desorption kinetics. 
Supervisor : Prof. Dr. ELSayed Ibrahim Shalaan 
Thesis Type : Doctorate Thesis 
Publishing Year : 1443 AH
2022 AD 
Co-Supervisor : Prof. Dr. Fahad Massoud Al-Marzouki 
Added Date : Monday, January 16, 2023 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
اشواق عبدالرحمن العجيريAL-Ojeery, Ashwaq AbdulrahmanResearcherDoctorate 

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