Jehad Abed

Jehad Abed
University of Toronto | U of T · Department of Materials Science and Engineering

Ph.D. Materials Science and Engineering
Guest Editor at Calaysts MDPI | Vanier Scholar

About

42
Publications
22,044
Reads
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531
Citations
Additional affiliations
September 2018 - present
University of Toronto
Position
  • PhD Student
June 2017 - August 2018
Khalifa University
Position
  • Engineer
September 2015 - May 2017
Khalifa University
Position
  • Research Assistant
Education
September 2018 - August 2022
University of Toronto
Field of study
  • Materials Science and Engineering
September 2015 - July 2017
Khalifa University
Field of study
  • Materials Science & Engineering
September 2011 - January 2015
University of Sharjah
Field of study
  • Sustainable & Renewable Energy Engineering

Publications

Publications (42)
Article
Full-text available
In hydrogen production, the anodic oxygen evolution reaction (OER) limits the energy conversion efficiency and also impacts stability in proton-exchange membrane water electrolyzers. Widely used Ir-based catalysts suffer from insufficient activity, while more active Ru-based catalysts tend to dissolve under OER conditions. This has been associated...
Article
Full-text available
The oxygen evolution reaction (OER) limits the energy efficiency of electrocatalytic systems due to the high overpotential symptomatic of poor reaction kinetics; this problem worsens over time if the performance of the OER electrocatalyst diminishes during operation. Here, a novel synthesis of nanocrystalline Ni–Co–Se using ball milling at cryogeni...
Article
Full-text available
Metal borides/borates have been considered promising as oxygen evolution reaction catalysts; however, to date, there is a dearth of evidence of long-term stability at practical current densities. Here we report a phase composition modulation approach to fabricate effective borides/borates-based catalysts. We find that metal borides in-situ formed m...
Article
Full-text available
The electrochemical conversion of CO 2 to methane provides a means to store intermittent renewable electricity in the form of a carbon-neutral hydrocarbon fuel that benefits from an established global distribution network. The stability and selectivity of reported approaches reside below technoeconomic-related requirements. Membrane electrode assem...
Preprint
Full-text available
To enable the accelerated discovery of materials with desirable properties, it is critical to develop accurate and efficient search algorithms. Quantum annealers and similar quantum-inspired optimizers have the potential to provide accelerated computation for certain combinatorial optimization challenges. However, they have not been exploited for m...
Article
The electrochemical CO2 reduction reaction (CO2RR) provides a route to store intermittent electricity in the form of fuels like methane. We reasoned that disrupting C-C coupling while maintaining high ∗CO coverage could enhance methane selectivity and suppress the hydrogen evolution reaction (HER). We studied the effect of doping CuAl, a material a...
Article
Full-text available
The high-energy-density C3 fuel n-propanol is desired from CO2/CO electroreduction, as evidenced by propanol’s high market price per tonne (approximately US$ 1,400–1,600). However, CO electroreduction to n-propanol has shown low selectivity, limited production rates and poor stability. Here we report catalysts, identified using computational screen...
Article
Full-text available
Perovskite quantum dots (QDs) are of interest for solution‐processed lasers; however, their short Auger lifetime has limited lasing operation principally to the femtosecond temporal regime the photoexcitation levels to achieve optical gain threshold are up to two orders of magnitude higher in the nanosecond regime than in the femtosecond. Here the...
Article
We explore the selective electrocatalytic hydrogenation of lignin monomers to methoxylated chemicals, of particular interest, when powered by renewable electricity. Prior studies, while advancing the field rapidly, have so far lacked the needed selectivity: when hydrogenating lignin-derived methoxylated monomers to methoxylated cyclohexanes, the de...
Preprint
Full-text available
Catalytic hydrogenation of bio-oil provides an avenue to produce renewable chemicals. To this end, electrocatalytic hydrogenation is especially interesting when powered using low-carbon electricity; however, it has to date lacked the needed selectivity: when hydrogenating bio-oil to oxygenated hydrocarbons, for example, it reduces the desired oxyge...
Article
Full-text available
Plasmonic nanostructures have played a key role in extending the activity of photocatalysts to the visible light spectrum, preventing the electron-hole combination and providing with hot electrons to the photocatalysts, a crucial step towards efficient broadband photocatalysis. One plasmonic photocatalyst, Au/TiO 2 , is of a particular interest bec...
Article
We report formate production via CO2 electroreduction at a Faradaic efficiency (FE) of 93% and a partial current density of 930 mA cm-2, an activity level of potential industrial interest based on prior techno-economic analyses. We devise a catalyst synthesized using InP colloidal quantum dots (CQDs): the capping ligand exchange introduces surface...
Article
Full-text available
Electroreduction uses renewable energy to upgrade carbon dioxide to value-added chemicals and fuels. Renewable methane synthesized using such a route stands to be readily deployed using existing infrastructure for the distribution and utilization of natural gas. Here we design a suite of ligand-stabilized metal oxide clusters and find that these mo...
Preprint
Full-text available
Colloidal quantum dots (CQDs) are promising materials for IR light detection due to their tunable bandgap and solution processing; but to date, the time response of CQD IR photodiodes has been inferior to that provided by Si and InGaAs. We reasoned that the high permittivity of II-VI CQDs leads to slow charge extraction due to screening and capacit...
Article
Full-text available
The atmosphere contains an abundance of fresh water, but this resource has yet to be harvested efficiently. To date, passive atmospheric water sorbents have required a desorption step that relies on steady solar irradiation. Since the availability and intensity of solar radiation vary, these limit on-demand desorption and hence the amount of harves...
Preprint
Full-text available
The oxygen evolution reaction (OER) limits electrocatalysis due to the high overpotential incurred by the poor reaction kinetics; this problem worsens over time if the performance of the OER electrocatalyst diminishes during operation. Here, we report the synthesis of immiscible Ni-Co-Se nanoparticles (<10 nm) for alkaline OER using milling at a cr...
Article
Full-text available
Infrared‐absorbing colloidal quantum dots (IR CQDs) are materials of interest in tandem solar cells to augment perovskite and cSi photovoltaics (PV). Today's best IR CQD solar cells rely on the use of passivation strategies based on lead iodide; however, these fail to passivate the entire surface of IR CQDs. Lead chloride passivated CQDs show impro...
Article
Due to the rapid increase in their efficiencies, third generation photovoltaics rose to prominence in recent years, and became serious competitors to conventional silicon based and thin film solar cells. This work investigates various techniques to grow and/or deposit copper oxide (CuO) on a copper substrate for utilization as a counter electrode i...
Article
Full-text available
To develop operative surface-enhanced Raman spectroscopy (SERS) sensors, nanostructures with high signal enhancement and ease of production are highly desired. SERS-active nanoparticle-gap-film (NGF) sandwich substrate using graphene as the gap nanospacer is of particular interest due to its strong local field enhancement associated with the atomic...
Article
Full-text available
The surface plasmon resonance of dewetted Au structures on TiO2 substrate using physical vapor deposition and post-annealing is investigated. In this work, we employ an aperture-probe scanning near-field optical microscope (SNOM) to study the plasmonic properties of dewetted Au structures and the influence of the size, shape, and interdistance of t...
Article
Crude oil and the rock surface interactions are key inputs to develop innovative methods for enhanced oil recovery (EOR). In this work, a novel in-situ atomic force microscopy technique (PeakForce Force Volume) is used to map the adhesion forces between dead crude oil and carbonate rocks rich with natural Calcite and Dolomite minerals. The samples...
Article
This work demonstrates the viability of direct fabrication utilizing a single (deposition/anneal) process for polycrystalline silicon germanium sub-micro particles. The process combines plasma chemical vapor deposition enhanced with inductively coupled radio frequency plasma at intermediate pressure and high temperature for deposition and rapid the...
Thesis
Full-text available
The energy harvested from the sun is an everlasting source with minimal effect on the environment. However, due to the lack of reliability and consistency in supply, the harvested energy from the sun needs to be converted and stored into a more reliable and effective means of fuel that can be used on demand. One of the promising solar-powered techn...
Article
The construction and testing of a modular, low pressure compressed air energy storage (CAES) system is presented. The low pressure assumption (5 bar max) facilitates the use of isentropic relations to describe the system behavior, and practically eliminates the need for heat removal considerations necessary in higher pressure systems to offset the...
Article
Full-text available
This study investigates the performance of dye-sensitized solar cells constructed with a Fe-Cu metastable material as the mesoporous layer on which a natural organic dye is applied. The synthesis of the Fe-Cu material is done via a high throughput process that produces nanosized particles from elemental metallic powders. Xanthophyll is singled out...
Article
Full-text available
This paper investigates the effect of applying static and dynamic magnetic fields on the deposition of Fe-Cu compound on the working electrode of a dye-sensitized solar cell. The deposition of this compound on glass is complicated due to the fact that it cannot be evaporated or sintered beyond the dissociation temperature of 973 K (700 °C), and the...
Article
This paper investigates the effect of applying static and dynamic magnetic fields on the deposition of Fe-Cu compound on the working electrode of a dye-sensitized solar cell. The deposition of this compound on glass is complicated due to the fact that it cannot be evaporated sintered beyond the dissociation temperature of 973 K (700°C), and the doc...
Article
Full-text available
Titanium dioxide (TiO2) loaded with gold (Au) as noble metal, acts as an efficient photocatalyst that has been extensively investigated for water splitting processes. In this paper, we report on the microstructure of atomic layer deposited titanium dioxide and the crystallinity modification of the material using energetic electron beam irradiation....
Conference Paper
Full-text available
This paper investigates the synthesis, microstructural characterization, electrical and optical and thermal testing of Fe-Cu metastable alloy system for selective solar absorption applications. The system is produced by mechanical alloying (MA) using high energy ball milling while monitoring its crystallographic morphology via X-ray diffraction (XR...
Article
This work evaluates the suitability of the Al 64 Cu 25 Fe 11 compound to enhance spectral solar absorption when replacing the mesoporous layer material of dye-sensitized solar cells. The compound is produced by high-energy ball milling, a mechanical alloying technique that ensures extensive inter-diffusion of the elemental components, while heat...
Conference Paper
Full-text available
This paper investigates the synthesis, microstructural characterization and thermal and optical properties of Al-Cu-Fe quasicrystalline system for selective solar absorption applications. A nominal composition of was produced by mechanical alloying (MA) using high-energy ball milling. Subsequent annealing was performed on the quasicrystalline sampl...
Article
Full-text available
This paper investigates the synthesis, microstructural characterization, electrical and optical, and thermal testing of Fe-Cu metastable alloy system for selective solar absorption applications. The system is produced by mechanical alloying using high-energy ball milling while monitoring its crystallographic morphology via X-ray diffraction from th...
Conference Paper
Full-text available
The synthesis and characterization of two types of nanomaterial and their investigation for enhanced solar irradiation absorption are presented and discussed. The microstructural, thermal and optical properties of a metastable alloy of 50-50% (wt.) Fe-Cu are compared with those of an icosahedral quasicrystalline microstructure of an Al 64 Cu 25 Fe...
Conference Paper
Full-text available
An experimental assessment of a facile and effective method for polymer welding is presented. The procedure was tested by using a 20 cm diameter clear crystal sphere to concentrate solar energy onto a small point, the size of which can be easily manipulated by varying the distance of the plane on which the workpieces are to rest. The motion of this...

Questions

Questions (3)
Question
What do the bright and dark spots indicate? Does a bright spot indicate a field enhancement and thus a plasmonic resonance? What is the proper simulation setup to use in Lumerical Software to reproduce experimental results? 
Question
I will be thankful if you explain in details how to do it for both or recommend a good reference
Question
The Integrated Sphere Module is used with PerkinElmer Lambda 1050, the size of the reflectance and transmission port is twice as big as the thin film.

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Projects

Projects (5)
Project
This is a Special Issue focused on the advances in the development of materials and systems for the efficient electro-oxidation of water, ammonia, and organic compounds into value-added products. This call includes both experimental and computational strategies to improve the overall performance of the reaction (reaction rate, product selectivity, durability, energy efficiency) by optimizing the physical properties of reaction components (catalyst, electrolyte, membrane), operating conditions, and reactor design. We are particularly interested in the selective oxidation of ammonia, alcohols, glycerol, ethylene, propene, methane, and higher alkanes to chemical products with a substantial market value. In addition, we highly encourage submissions that involve the development of earth-abundant catalysts that are both active and stable for water oxidation, which is essential for viable electrolysis in industrial conditions.
Project
Videos and illustrations to be used for educational purposes. In situ experiments and 3D imaging based on in situ ESEM, FIB-SEM and HRTEM Acknowledgement for authors
Project
The construction and testing of a modular, low pressure compressed air energy storage (CAES) system. The low pressure assumption (5 bar max) facilitates the use of isentropic relations to describe the system behavior, and practically eliminates the need for heat removal considerations necessary in higher pressure systems to offset the temperature rise.