Sayed M. El-Refaei

Sayed M. El-Refaei
Humboldt-Universität zu Berlin | HU Berlin · Institute for Chemistry

Master of Science, Cairo University

About

15
Publications
2,073
Reads
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236
Citations
Additional affiliations
April 2011 - present
Faculty of Science, Cairo University
Position
  • Research Assistant
April 2011 - present
Cairo University
Position
  • Research Assistant
April 2011 - present
Chemistry departement
Position
  • Research Assistant

Publications

Publications (15)
Article
Coordination polymers (CPs) and metal-organic frameworks (MOFs) have emerged as versatile precursors for transition-metal phosphides catalysts. However, the controlled synthesis of CPs-derived bimetallic phosphides remains a challenge, as mixtures of various phosphide phases are often formed. Here, it is shown that controlling the formation of pure...
Preprint
Coordination polymers (CPs) and metal-organic frameworks (MOFs) have emerged as versatile precursors for transition-metal phosphides catalysts. However, the controlled synthesis of MOF-derived bimetallic phosphides remains a challenge, as mixtures of various phosphide phases are often formed. Here, it is shown that controlling the formation of pure...
Article
The characterization of the active structure of water splitting catalysts is crucial to evolve to a sustainable energy future based on hydrogen. Such an information can only be obtained by operando methods. We present a diffuse reflectance UV-Vis (DRUV) spectroelectrochemical study that allows to track the changes of solid oxygen evolution catalyst...
Preprint
div>This is a complete self-standing study on operando diffuse reflectance UV-vis spectroelectrochemistry for investigating oxygen evolution electrocatalysts.</div
Article
To arrive to sustainable hydrogen‐based energy solutions, the understanding of water‐splitting catalysts plays the most crucial role. Herein, state‐of‐the‐art hypotheses are combined on electrocatalytic active metal sites toward the oxygen evolution reaction (OER) to develop a highly efficient catalyst based on Earth‐abundant cobalt and zinc oxides...
Article
Nanocomposites made of stacked‐cup carbon nanotubes coated with NiO (NiO/SCCNTs) via atomic layer deposition (ALD) were synthesized in order to obtain a material exhibiting enhanced and optimized electrochemical performances towards the detections of glucose. The structure and morphology were characterized by transmission electron microscopy (TEM)...
Article
Full-text available
The hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) play key roles in the conversion of energy derived from renewable energy sources into chemical energy. Efficient, robust, and inexpensive electrocatalysts are necessary for driving these reactions at high rates at low overpotentials and minimize energetic losses. Recently...
Article
Full-text available
A novel non-precious multiwalled carbon nanotubes (CNTs)—supported metal oxide electrocatalyst was developed for methanol electrooxidation in alkaline medium. The catalyst was fabricated by simultaneous electrodeposition of copper-cobalt-nickel ternary nanostructures (CuCoNi) on a glassy carbon electrode (GCE) modified with CNTs. The proposed elect...
Chapter
Full-text available
The current study presents a comparison for the electro-oxidation of formic acid (FA), glucose (GL), and methanol (ME) at nickel oxide nanoparticles (NiOx) modified electrodes. The modification with NiOx was pursed onto a bare glassy carbon (GC) and Pt-modified (Pt/GC) electrodes electrochemically, and the catalytic activity was measured in 0.3 M N...
Conference Paper
Full-text available
The nickel oxide-platinum nanoparticles modified glassy carbon electrode (NiOx/Pt/GC) is used as an effective anode for the oxidation of formic acid (FA), methanol (ME) and ethanol (ET) in 0.3 NaOH solution. The loading of GC with NiOx and Pt is achieved electrochemically. The modified electrodes are characterized using cyclic voltammetry (CV) and...
Conference Paper
Full-text available
The current study presents a comparison for the electro-oxidation of formic acid (FA), glucose (GL) and methanol (ME) at nickel oxide nanoparticle (NiOx) modified electrodes. The modification with NiOx was pursed onto a bare glassy carbon (GC) and Pt-modified (Pt/GC) electrodes electrochemically and the catalytic activity was measured in 0.3 M NaOH...
Article
Full-text available
This paper is devoted to the investigation of the tolerance of glucose oxidation on NiOx /MnOx /GC binary catalyst to poisoning by halide ions. NiOx /MnOx /GC electrode was prepared by the consecutive electrodeposition of MnOx followed by the deposition of NiOx nanoparticles atop the previously deposited MnOx nanoparticles. The electrode was charac...

Questions

Questions (2)
Question
The ink is composed 6 mg of catalyst (MOFs) dispersed in 0,7 ml H2O +0,3 ml C2H5OH+0,05 ml Nafion (5% wt).
I have tried different ratios of water:ethanol, but the same problem still exist.
I handly coat 1 cm2 of the nickel foil with 0,015 ml of ink and i have tried different amounts (0,005 / 0,01) and the same problem occurs.
Attached photo of coated nickel foil.   

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Projects

Project (1)
Archived project
Water splitting electrocatalysts. Electrodes for Li-ion batteries and supercapacitors.