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Development of a highly efficient, nickel-based nano-catalyst in the carbon dioxide reformation of methane is reported. The alumina supported Ni-based catalyst with a metal loading of 5wt% was prepared via solution combustion synthesis (SCS) method and conventional wetness impregnation method. Compared to that of conventional Ni(I) catalyst, the Ni(SCS) catalyst exhibited high activity for methane...
The theoretical vibrational spectrum, oxygen bond dissociation energies (BDE), atomic charges and hydrogen bonding has been investigated using wB97XD/6-31g(d) method of calculation. The order of BDE for C-O comes in the ascending order starting from hydroxyl group above or below the graphene sheet, one of the epoxy bridge bonds, phenolic, OH of carboxylic acid, hydroxyl groups on the terminals, and...
Silicon nanowires have been subjected to several experiential and theoretical studies, including chemical tuning with different substituents aiming to tailor the band gap as well as increasing optical absorption efficiency of solar energy. In this study, we report the effect of oxidation on silicon nanowires compared to hydroxyl passivation using theoretical DFT calculations. Surprisingly, extensive...
We will report on the role of the length of silicon nanowire (SNW) in determining the band gap of a structure. We find that the band gap decreases with SNW length for the same diameter and approaches the band gap for an ideal infinitely long SNW. The H/T atomic ratio can be used to express the S/V ratio, which is approximately linearly related to band gap value.
We model single silicon nanowire (SiNW) solar cells with dissimilar work function metal contacts. Both short circuit current (ISC) and open circuit voltage (VOC) have been investigated. Effects of nanowire dimension, minority carrier lifetime, and contact metal work function difference are investigated. Both ISC and VOC increase with nanowire length before saturating due to minority carrier recombination...
Lithium-ion battery packs are more prevalent in transportation applications. These batteries are typically characterized by their higher energy density and reduced need for maintenance. This paper will show how the intelligence needed for safe operation and long life of an electric vehicle's lithium-ion battery pack can be leveraged to provide a complete logistics solution that allows a fleet operator...
The necessity to significantly enhance efficiency of transportation vehicles in response to global warming issues and to ever-increasing oil prices is recognized around the world. Hybrid electric vehicles (HEV's) were the first proposed solution to reduce energy consumption, however much additional improvement is necessary. Benefits of HEV's include a smaller internal combustion engine (ICE), the...
In this paper, an outline of a project has been covered in which a ZiP'r4 electric scooter was first analyzed and later converted to a hybrid PEM fuel cell - Li-ion battery powered vehicle. An automatic hybrid controller for the vehicle power management is also proposed. This design can be implemented in the longer run on general vehicles; thus creating independence from fossil fuels.
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