Mohamed Ahmed Sultan Hindawy

@orcid.org

Chemistry department - Science Faculty - Cairo University
Cairo University

Mohamed Ahmed Sultan Hindawy


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https://researchid.co/mohamedsultan

RESEARCH, TEACHING, or OTHER INTERESTS

Electrochemistry, Catalysis, Physical and Theoretical Chemistry, Renewable Energy, Sustainability and the Environment
9

Scopus Publications

87

Scholar Citations

6

Scholar h-index

4

Scholar i10-index

Scopus Publications

  • Synergistic electrocatalytic performance of nano-sized 1D Pd-MOF/NF for urea oxidation in alkaline media
    Khaled M. Ismail, Hanaa B. Hassan, Safaa S. Hassan, Mohamed A. Sultan
    International Journal of Hydrogen Energy, 2026
    Urea is widely recognized as a promising energy source due to its abundance in the environment. Its electrooxidation offers a sustainable pathway for hydrogen generation and wastewater treatment. In this work, a nano-sized one-dimensional palladium metal-organic framework (1D Pd-MOF) was synthesized via a chemical route and drop-cast onto nickel foam (NF), serving as an efficient catalyst promoter for the electrooxidation of urea. The fabricated electrodes were characterized using SEM coupled with EDX and elemental mapping, ICP-OES, XRD, and XPS. Electrochemical evaluations revealed a substantial enhancement in urea oxidation current density, achieving 43 mA cm −2 on the 1D Pd-MOF/NF electrode, compared to 10 mA cm −2 on bare NF. Repeated cyclic voltammetry and chronoamperometry tests confirmed the enhanced stability of the 1D Pd-MOF/NF electrode under operating conditions. Furthermore, the heterogeneous rate constant for urea oxidation was significantly higher on the 1D Pd-MOF/NF electrode (1.73 × 10 5 mol −1 cm 3 s −1 ) than on NF (2.5 × 10 4 mol −1 cm 3 s −1 ). Anodic Tafel slope values of 136 and 113 mV dec −1 for NF and 1D Pd-MOF/NF, respectively, indicate facile urea oxidation at the 1D Pd-MOF/NF electrode. However, the significantly lower charge-transfer resistance of 1.84 Ω cm 2 on the 1D Pd-MOF/NF electrode highlights its superior charge-transfer kinetics and overall electrocatalytic performance for urea oxidation. The CV and EIS results indicate that urea electrooxidation proceeds via a mixed kinetic mechanism, involving both surface-confined and diffusion-controlled processes.
  • Boosted ethanol oxidation in alkaline media with 1D Pd-MOF for enhanced fuel cell performance
    Safaa S. Hassan, Mohamed A. Sultan, Khaled M. Ismail, Hanaa B. Hassan
    Inorganic Chemistry Communications, 2025
  • Enhanced electrocatalytic alcohol oxidation with Ni-MOF for direct alcohol fuel cell applications
    Mohamed A. Sultan, Hanaa B. Hassan, Safaa S. Hassan, Khaled M. Ismail
    International Journal of Hydrogen Energy, 2025
  • Nickel and/or platinum modified crystalline silicon–carbon composites and their electrochemical behaviour towards the hydrogen evolution reaction
    Merna N. Elsodany, M. A. Abdel Rahim, Nasser H. Shalaby, M. A. Sultan
    Journal of Applied Electrochemistry, 2024
    Generation of hydrogen is very important, as it is one of the most desired alternatives to fossil fuels. Moreover, designing of cheap and stable electrocatalysts is the task for the efficient generation of hydrogen with reasonable activity. Materials hybridization can be considered a tool for engineering different material properties. Composites of modified silicon such as C–Si, Ni/(C–Si), Pt/(C–Si), and Pt–Ni/(C–Si) were prepared (in weight percent) and studied as electrocatalysts for the hydrogen evolution reaction (HER) in 0.5 M H2SO4 solution. The surface morphologies and chemical compositions of the composites were confirmed using transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), X-ray fluorescence analysis (XRF), elemental mapping, and BET surface analysis. The electrochemical measurements of linear sweep voltammetry (LSV), Tafel plots, chronoamperometry, and electrochemical impedance spectroscopy (EIS) were used to study the behaviour of the prepared electrodes toward the hydrogen evolution process. Among the various prepared composites, [7%Pt–3%Ni]/[C–Si (1:1)] composite shows the best catalytic activity with the highest HER rate (940.95 µA cm−2 s−1), the lowest overpotential [0.358 V vs. (Ag/AgCl) ≈ 0.161 V vs. (RHE)] at 10 mA cm−2, and the lowest charge transfer resistance (2.657 Ω) compared to other prepared electrodes. In addition, it gives the highest values of 4.219 × 10−3 s−1 turn over frequency (TOF) and 642 mA g−1 mass activity. It shows good stability towards the hydrogen evolution reaction as the current density reaches about 34.28 mA cm−2 after 5 h. Graphical abstract
  • A novel Ni-Schiff base complex for motivating glucose electrooxidation in alkaline solutions
    M. A. Sultan, Safaa S. Hassan, K. A. Omran, H. B. Hassan
    Materials Advances, 2024
    Many Schiff-base complexes of metal ions display enhanced catalytic activities toward redox reactions of many organic compounds; accordingly, its application in electrocatalysis is a crucial issue.
  • Voltammetric determination of daclatasvir dihydrochloride at bimetallic Ag/Co nanoparticles modified carbon paste electrode
    Sayed S. Badawy, Yomna M. Ahmed, M.A. Sultan
    Microchemical Journal, 2023
  • Stimulation of ethylene glycol electrooxidation on electrodeposited Ni–PbO2–GN nanocomposite in alkaline medium
    M. A. Sultan, H. B. Hassan, Reham H. Tammam
    Journal of Applied Electrochemistry, 2023
    In this work, a novel system composed of non-precious nickel-based metal oxide/reduced graphene oxide nanocomposite (Ni–PbO2–GN) is used for electrooxidation of ethylene glycol (EG) in 1.0 M NaOH solution and compares its activity with that of Ni, Ni–GN, and Ni–PbO2. The facile electrodeposition technique is used to prepare the catalysts on glassy carbon (GC) substrates. The outcomes of electrochemical measurements show a high performance towards EG oxidation is obtained for Ni-nanocomposite electrodes compared to that of Ni mainly due to their higher surface areas. The excellent electrocatalytic properties of the Ni-nanocomposite could be ascribed to the synergistic contributions of PbO2 and graphene (GN) nano-sheets that help the reduction of Ni grains. A smaller charge transfer resistance value of 34.5 Ω cm2 for EG oxidation reaction at + 360 mV is recorded for GC/Ni–PbO2–GN compared to the other prepared electrodes. Moreover, it exhibits higher kinetic parameters of EG such as diffusion coefficient (D = 3.9 × 10–10 cm2 s−1) and charge transfer rate constant (ks = 32.5 mol−1 cm3 s−1). The overall performance and stability of the prepared catalysts towards EG electrooxidation have been estimated to be in the order of GC/Ni–PbO2–GN > GC/Ni–GN > GC/Ni–PbO2 > GC/Ni. Graphical abstract
  • Electrodeposition of Ni-W and Ni-W-P films using a pulse current technique and their application for hydrogen evolution in an acidic solution
    Zeinab Abdel Hamid, H.B. Hassan, Mohamed Sultan
    Anti Corrosion Methods and Materials, 2020
    Purpose The improvement of the hydrogen evolution reaction (HER) performance requires more efficient and inexpensive electrocatalysts. The purpose of this study is to prepare Ni-W and Ni-W-P thin films using the electrodeposition technique using a pulse current and investigate their behaviors toward HER in an acidic solution. Design/methodology/approach The aim is to prepare Ni-W and Ni-W-P films by the electrodeposition technique using a pulse current and estimate their performance for the HER. The surface morphologies and chemical compositions of the deposited films were assessed using scanning electron microscopy, energy-dispersive X-ray analysis and X-ray diffraction. Linear sweep voltammetry, chronoamperometry, Tafel plots and electrochemical impedance spectroscopy were used to evaluate the prepared electrodes toward the hydrogen evolution process. Findings The main conclusion is that the surface morphology of Ni–W deposited film is a crystalline structure, while that of Ni-W-P deposit is an amorphous structure. HER activity on Ni-W electrodes increases with decreasing the Wt.% of W to 7.83 Wt.% in the prepared electrodes. In addition, the presence of P enhances HER activity, which increases with increasing the Wt.% of P in the prepared Ni-W-P electrodes. Both Ni-W (7.83 Wt.% W) and Ni-W-P (20.34 Wt.% P), which have been prepared at 8 A dm−2 display the best performance toward HER compared to the other prepared electrodes. They exhibit high catalytic activities toward HER, which is evidenced by high hydrogen evolution current density values of 9.52 and 33.98 mA cm−2, low onset potentials of −0.73 and −0.63 V, low Tafel slopes of −125 mV/dec, high exchange current densities of 0.058 and 0.20 mA cm−2, low charge transfer resistances (Rct) of 226.28 and 75.8 ohm·cm2 for Ni-W (7.83 Wt.% W) and Ni-W-P (20.34 Wt.% P), respectively; moreover, they exhibited considerable stabilities too. Originality/value The results presented in this work are an insight into understanding the performance of the prepared Cu electrodes coated by Ni-W and Ni-W-P films toward HER. In this work, a consistent assessment of the results achieved on laboratory scale has been conducted.
  • Carbon supported mono- and bi-metallic dispersed thin film catalysts for oxygen electro-reduction reaction in acid medium
    M.A. Abdel Rahim, M.W. Khalil, M.A. Sultan
    International Journal of Electrochemical Science, 2017
    The present study reports the use of mono- and binary-metal thin film deposits of Pt, Cu, Ru and Pd dispersed over carbon electrode as electro-catalysts for oxygen reduction. The metals are sequentially electrodeposited on the carbon electrode from their aqueous solutions using the potentiostatic technique. The electrode surface characterization was carried out by scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersed X-ray (EDX). The micrographs of SEM analyses showed that the thin films of the various deposits are located at the electrode surface in the nano-scale range. Linear sweep voltammetry was used to investigate the electrode performance towards oxygen reduction in H2SO4 solution in the absence and presence of H2O2. The results indicated that metal deposits and platinum-metal modified carbon electrodes have shown superior electro-catalytic activity toward oxygen reduction reaction (ORR) as shown by the relative increase in the peak current density values of oxygen reduction.

RECENT SCHOLAR PUBLICATIONS

  • Synergistic electrocatalytic performance of nano-sized 1D Pd-MOF/NF for urea oxidation in alkaline media
    KM Ismail, HB Hassan, SS Hassan, MA Sultan
    International Journal of Hydrogen Energy 224, 154363 , 2026
    2026
  • Boosted ethanol oxidation in alkaline media with 1D Pd-MOF for enhanced fuel cell performance
    SS Hassan, MA Sultan, KM Ismail, HB Hassan
    Inorganic Chemistry Communications, 115144 , 2025
    2025
    Citations: 5
  • Enhanced electrocatalytic alcohol oxidation with Ni-MOF for direct alcohol fuel cell applications
    MA Sultan, HB Hassan, SS Hassan, KM Ismail
    International Journal of Hydrogen Energy 100, 528-547 , 2025
    2025
    Citations: 18
  • Nickel and/or platinum modified crystalline silicon–carbon composites and their electrochemical behaviour towards the hydrogen evolution reaction
    MN Elsodany, MA Abdel Rahim, NH Shalaby, MA Sultan
    Journal of Applied Electrochemistry 54 (3), 531-546 , 2024
    2024
    Citations: 7
  • A novel Ni–Schiff base complex for motivating glucose electrooxidation in alkaline solutions
    MA Sultan, SS Hassan, KA Omran, HB Hassan
    Materials Advances 5 (3), 1264-1283 , 2024
    2024
    Citations: 23
  • Voltammetric determination of daclatasvir dihydrochloride at bimetallic Ag/Co nanoparticles modified carbon paste electrode
    SS Badawy, YM Ahmed, MA Sultan
    Microchemical Journal 191, 108799 , 2023
    2023
    Citations: 12
  • Stimulation of ethylene glycol electrooxidation on electrodeposited Ni–PbO 2 –GN nanocomposite in alkaline medium
    MA Sultan, HB Hassan, RH Tammam
    Journal of Applied Electrochemistry 53 (3), 463-486 , 2023
    2023
    Citations: 8
  • Electrodeposition of Ni-W and Ni-WP films using a pulse current technique and their application for hydrogen evolution in an acidic solution
    Z Abdel Hamid, HB Hassan, M Sultan
    Anti-Corrosion Methods and Materials 67 (1), 38-47 , 2020
    2020
    Citations: 12
  • Electrooxidation and Determination of Tramadol at Mixed Ion Pair Chemically Modified Carbon Paste Electrode
    YMA Sayed S. Badawy, M. A. Sultan
    Egypt. J. Anal. Chem. 28, 1-11 , 2019
    2019
  • Carbon supported mono-and bi-metallic dispersed thin film catalysts for oxygen electro-reduction reaction in acid medium
    MAA Rahim, MW Khalil, MA Sultan
    International Journal of Electrochemical Science 12 (8), 7890-7910 , 2017
    2017
    Citations: 2
  • Electrocatalytic oxidation of glucose at modified titanium silicalite electrode
    RMAH M. A. Sultan, M. W. Khalil, M. A. Abdel Rahim
    ELECTROCHEMISTRY 2014 (Basic Science and Key Technology for Future … , 2014
    2014

MOST CITED SCHOLAR PUBLICATIONS

  • A novel Ni–Schiff base complex for motivating glucose electrooxidation in alkaline solutions
    MA Sultan, SS Hassan, KA Omran, HB Hassan
    Materials Advances 5 (3), 1264-1283 , 2024
    2024
    Citations: 23
  • Enhanced electrocatalytic alcohol oxidation with Ni-MOF for direct alcohol fuel cell applications
    MA Sultan, HB Hassan, SS Hassan, KM Ismail
    International Journal of Hydrogen Energy 100, 528-547 , 2025
    2025
    Citations: 18
  • Voltammetric determination of daclatasvir dihydrochloride at bimetallic Ag/Co nanoparticles modified carbon paste electrode
    SS Badawy, YM Ahmed, MA Sultan
    Microchemical Journal 191, 108799 , 2023
    2023
    Citations: 12
  • Electrodeposition of Ni-W and Ni-WP films using a pulse current technique and their application for hydrogen evolution in an acidic solution
    Z Abdel Hamid, HB Hassan, M Sultan
    Anti-Corrosion Methods and Materials 67 (1), 38-47 , 2020
    2020
    Citations: 12
  • Stimulation of ethylene glycol electrooxidation on electrodeposited Ni–PbO 2 –GN nanocomposite in alkaline medium
    MA Sultan, HB Hassan, RH Tammam
    Journal of Applied Electrochemistry 53 (3), 463-486 , 2023
    2023
    Citations: 8
  • Nickel and/or platinum modified crystalline silicon–carbon composites and their electrochemical behaviour towards the hydrogen evolution reaction
    MN Elsodany, MA Abdel Rahim, NH Shalaby, MA Sultan
    Journal of Applied Electrochemistry 54 (3), 531-546 , 2024
    2024
    Citations: 7
  • Boosted ethanol oxidation in alkaline media with 1D Pd-MOF for enhanced fuel cell performance
    SS Hassan, MA Sultan, KM Ismail, HB Hassan
    Inorganic Chemistry Communications, 115144 , 2025
    2025
    Citations: 5
  • Carbon supported mono-and bi-metallic dispersed thin film catalysts for oxygen electro-reduction reaction in acid medium
    MAA Rahim, MW Khalil, MA Sultan
    International Journal of Electrochemical Science 12 (8), 7890-7910 , 2017
    2017
    Citations: 2
  • Synergistic electrocatalytic performance of nano-sized 1D Pd-MOF/NF for urea oxidation in alkaline media
    KM Ismail, HB Hassan, SS Hassan, MA Sultan
    International Journal of Hydrogen Energy 224, 154363 , 2026
    2026
  • Electrooxidation and Determination of Tramadol at Mixed Ion Pair Chemically Modified Carbon Paste Electrode
    YMA Sayed S. Badawy, M. A. Sultan
    Egypt. J. Anal. Chem. 28, 1-11 , 2019
    2019
  • Electrocatalytic oxidation of glucose at modified titanium silicalite electrode
    RMAH M. A. Sultan, M. W. Khalil, M. A. Abdel Rahim
    ELECTROCHEMISTRY 2014 (Basic Science and Key Technology for Future … , 2014
    2014