A5012718530- Nanowire Synthesis and Applications
- Conducting polymers and applications
- Advanced Photocatalysis Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- melanin and skin pigmentation
- Supercapacitor Materials and Fabrication
- Silicon Nanostructures and Photoluminescence
- Metal-Organic Frameworks: Synthesis and Applications
- Thin-Film Transistor Technologies
- Catalytic Processes in Materials Science
- Carbon dioxide utilization in catalysis
- Advanced biosensing and bioanalysis techniques
- Covalent Organic Framework Applications
- Advanced battery technologies research
- Biochemical Analysis and Sensing Techniques
- Photonic and Optical Devices
- Silk-based biomaterials and applications
- CO2 Reduction Techniques and Catalysts
- Solar Radiation and Photovoltaics
- Catalysis for Biomass Conversion
- Ga2O3 and related materials
- MXene and MAX Phase Materials
- Biosensors and Analytical Detection
- Copper-based nanomaterials and applications
- TiO2 Photocatalysis and Solar Cells
University of Toronto
2022-2025
Polytechnique Montréal
2019-2022
American University in Cairo
2016-2018
Ain Shams University
2017-2018
Operating the dry reforming reaction photocatalytically presents an opportunity to produce commodity chemicals from two greenhouse gases, carbon dioxide and methane, however, top-performing photocatalysts presented in academic literature invariably rely on use of precious metals. In this work, we demonstrate enhanced photocatalytic performance through surface basicity modulation a Ni-CeO2 photocatalyst by selectively phosphating CeO2 nanorod support. An optimum phosphate content is observed,...
Formic acid is considered as one of the most promising liquid organic hydrogen carriers. Its catalytic dehydrogenation process generally suffers from low activity, reaction selectivity, stability catalysts, and/or use noble-metal-based catalysts. Herein we report a highly selective, efficient, and noble-metal-free photocatalyst for formic acid. This catalyst, UiO-66(COOH)2-Cu, built by postmetalation carboxylic-functionalized Zr-MOF with copper. The visible-light-driven photocatalytic...
Abstract Although solar fuels photocatalysis offers the promise of converting carbon dioxide directly with sunlight as commercially scalable solutions have remained elusive over past few decades, despite significant advancements in band‐gap engineering and atomic site activity. The primary challenge lies not discovery new catalyst materials, which are abundant, but overcoming bottlenecks related to material‐photoreactor synergy. These factors include achieving photogeneration charge‐carrier...
As the global quest for sustainable energy keeps rising, exploring novel efficient and practical photocatalysts remains a research industrial urge. Particularly, metal organic frameworks were proven to contribute various stages of carbon cycle, from CO2 capture its conversion. Herein, we report photo-methanation activity three isostructural, nickel-based incorporating additional niobium, iron, aluminum sites, having demonstrated exceptional abilities thin air in previous reports. The niobium...
The development of technologies integrating solar energy conversion and storage functions is critical for limiting the anthropogenic effects on climate change preventing possible shortages related to increase world population. In our work, we explored possibility integrate within same multifunctional biosourced material. We identified redox-active, quinone-based, melanin pigment, featuring a broadband absorption in UV-vis region, as ideal candidate such an exploration. Electrodes carbon...
Eumelanin is the most common form of pigment melanin in human body, with diverse functions including photoprotection, antioxidant behavior, metal chelation, and free radical scavenging. Melanin also plays a role melanoma skin cancer Parkinson's disease. Sepia natural eumelanin extracted from ink sac cuttlefish. an ideal candidate to eco-design technologies based on abundant, biosourced, biodegradable organic electronic materials alleviate environmental footprint electronics sector. Herein,...
A schematic illustration for the synthesis of g-C 3 N 4 -Mx/S nanocomposites and structure pouch cells demonstrating arrangements electrodes a separator.
In this study, the effective removal of three major micropollutants (e.g., propranolol hydrochloride, 1-naphthylamine, and 2-naphthol) from water is investigated using defected UiO-66 functionalized derivatives as adsorbents. The defects in are induced two distinct strategies. first one involves a process selectively thermolyzing labile linkers, leading to creation hierarchical mesoporous framework (HP-UiO-66). second technique employs monocarboxylic acid modulator, such acetic (AA) or...
In this paper, we report an easy and relatively cost effective fabrication technique of a wide band omnidirectional antireflective black silicon surface based on nanowires (SiNWs).
Abstract Biosourced and biodegradable organic electrode materials respond to the need for sustainable storage of renewable energy. Here, we report on electrochemical capacitors based electrodes made up quinones, such as Sepia melanin catechin/tannic acid (Ctn/TA), solution-deposited carbon paper engineered create high-performance interfaces. Ctn/TA TCP exhibit a capacitance high 1355 mF cm −2 (452 F g −1 ) 898 (300 ), respectively. symmetric operating in aqueous electrolytes 100% retention...
Low-cost, wideband, and wide-angle antireflective layers are of prime importance to photovoltaic other optoelectronic applications. We report a novel fabrication methodology random textured silicon nanocones (SiNCs) array through metal-assisted chemical etching combined with oxidation. The optical properties the fabricated structure studied theoretically experimentally. SiNCs showed very promising broadband entire visible wavelength range at different incident angles up ±60°. In addition,...
Surface enhanced Raman scattering has recently been proposed as a label free sensing method for diagnostic applications. is an excellent analysis tool because wealth of information can be obtained using single measurement, however the weak signal made it unsuitable detecting low concentrations analytes. Using plasmonic nanostructures to create SERS substrates, amplified by several orders magnitude, but substrates have complicated fabricate. Here we report low-cost silicon based on simple...
Carbon and carbon dioxide can be concurrently converted using light to monoxide via the reverse-Boudouard reaction.
The integration of solar energy conversion and electrochemical storage functions is critical for limiting the anthropogenic effects on climate change preventing possible shortages related to increase world population. Electrochemical technologies (batteries supercapacitors) have been investigated store generated from intermittent sources, like Sun. Abundant, low-cost, non-toxic, potentially biodegradable, organic molecular materials, extracted natural are ideal candidates applications in...
Abstract BACKGROUND Bio‐sourced (natural) organic materials are often chemically and structurally disordered, such that their structure‐property relationships must be explored using model systems. Eumelanin is an interesting candidate among natural materials. RESULTS In this work, the locations of highest occupied molecular orbital (HOMO) lowest unoccupied (LUMO) energy levels 5,6‐dihydroxyindole (DHI) 5,6‐dihydroxyindole‐2‐carboxylic acid (DHICA) building blocks (monomers) black‐brown...
We report large-scale fabrication of black silicon based on mesoporous nanowires (SiNWs) with reflectance <;0.1% in the solar irradiance peak (wavelength range 400 to 800 nm). The reflects <;2% at different incident angles up ±60°. consists mesporous SiNWs diameters 130-750 nm, matching wavelength light for improved trapping inside nanostructure. were synthesized through catalytic wet chemical etching. This study shows that surfaces can be used as an efficient broadband absorber energy...
We report surface enhanced Raman scattering substrates that are low cost and easy to fabricate using silver nanoparticles on silicon wafer nanowires decorated with the nanoparticles. Numerical simulations showed enhancement factors around 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> xmlns:xlink="http://www.w3.org/1999/xlink">8</sup> at hot spots, enabling single molecule detection. demonstrated experimentally reduced Graphene oxide...
High reflection losses and low photon absorption combined with high velocity large area surface recombination are the main obstacles for boosting efficiency of solar cell. We report a simple large-scale one step catalytic room temperature fabrication approach black silicon (B-Si) in an aqueous solution HF AgNO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> . B-Si based on porous nonporous Silicon nanowires (SiNWs) shows superior optical...
Abstract Organic electrode materials operating in aqueous electrolytes offer the opportunity to avoid toxic, critical, and expensive for electrochemical energy storage. When deposited on carbon current collectors, redox active organic add faradaic electrostatic capacitance contribution electrodes. Here, a 3D network material is reported upon, based sepia melanin, quinone macromolecule, nitrogen‐ sulfur‐doped graphitic quantum dots (N,S GCQDs) designed achieve good electronic conductivity...
Abstract The rising global demand for energy requires, among others, sustainable storage devices. Biosourced redox‐active molecules are interesting eco‐designed electrochemical as they increase the density of electrodes adding Faradaic (redox) mechanism to electrostatic one. engineering electrode surface and surface/molecule interface is key optimizing storage. Here, (i) prepared by ultrasound‐assisted modification carbon cloth in presence Sepia melanin, a quinone macromolecule, multiwalled...