Papers by Mohammed Benmessaoud
Chemistry Africa, Apr 26, 2024
Canadian metallurgical quarterly, Jun 19, 2024
Journal of Molecular Liquids
Electrochimica Acta, 2008
Silver-modified Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF) cathodes for intermediate-temperature so... more Silver-modified Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF) cathodes for intermediate-temperature solid-oxide fuel cells (IT-SOFCs) were prepared by an electroless deposition process using N 2 H 4 as the reducing agent at room temperature. This fabrication technique together with tailored electrode porosity, modified the BSCF electrodes with silver content that varied from 0.3 to 30 wt.% without damaging the electrode microstructure. Both the Ag loading and firing temperatures were found to have a significant impact on the electrode performance, which could facilitate or block the electrochemical processes of the BSCF-based cathodes, processes that include charge-transfer, oxygen adsorption and oxygen electrochemical reduction. At an optimal Ag loading of 3.0 wt.% and firing temperature of 850 • C, an area specific resistance of only 0.042 cm 2 at 600 • C was achieved for a modified BSCF cathode.
Journal of Molecular Structure
Journal of Molecular Structure, 2022
International Journal of Corrosion and Scale Inhibition
In this work, two epoxy compounds, namely: diglycidyl ether ethylene (DGEE) and diglycidyl ether ... more In this work, two epoxy compounds, namely: diglycidyl ether ethylene (DGEE) and diglycidyl ether benzene (DGEB) were evaluated as corrosion inhibitors for C38 steel in 1 M HCl medium. This assessment was performed using electrochemical stationary and transiency, density functional theory (DFT) methods, Monte Carlo, and molecular dynamic simulations. Moreover, the surface of the C38 steel before and after the corrosion test was examined using scanning electron microscopy (SEM). The inhibitory performance of both compounds is enhanced by increasing the concentration of the inhibitors tested, we obtained the most efficiency with an optimal concentration of 5 mM of the inhibitors used. This study permitted to survey the evolution of the inhibitory effect of the two epoxy compounds and show that these inhibitors act as mixed-type inhibitors delaying the rate of anodic and cathodic reactions. Their adsorption isotherms are Langmuir type and primary mechanisms involve physical adsorption. Also, the SEM study confirmed that corrosion inhibition of C38 steel occurs by adsorption of inhibiting molecules on the metal surface, which makes a barrier against corrosion of the latter. The Quantum chemical calculations confirmed the obtained experimental results.
International Journal of Corrosion and Scale Inhibition, 2021
Journal of Molecular Liquids, 2022
Surfaces and Interfaces, 2021
Materials Sciences and Applications, 2011
The inhibiting effect of N-decyl-3-amino-1,2,4-triazole (TN 10) against Copper corrosion in aerat... more The inhibiting effect of N-decyl-3-amino-1,2,4-triazole (TN 10) against Copper corrosion in aerated 3% NaCl, has been developed. Potentiodynamic measurements and electrochemical impedance spectroscopy have been applied to determine the corrosion rate. Scanning electron microscopy (SEM) studied surface morphology has been also used to characterize electrode surface. The obtained results indicate that TN 10 acts as a good mixed-type inhibitor retarding both anodic and cathodic reactions. An increase of TN 10 concentration leads to a decrease of corrosion rate and inhibition efficiency increase.
Corrosion Science, 2008
The phase behavior of poly (N-isopropylacrylamide) nanoparticles dispersed in aqueous medium is i... more The phase behavior of poly (N-isopropylacrylamide) nanoparticles dispersed in aqueous medium is investigated as a function of temperature using static and dynamic light scattering techniques. The diameter, d of the particles, as determined by dynamic light scattering measurements on dilute dispersion showed a decrease in size from 273 nm at 25 °C to 114 nm at 40 °C as function of temperature with a sudden collapse of particle volume (volume phase transition) at 32.4 °C. Further this nanoparticle dispersion is found to turn turbid beyond volume phase transition. Static light scattering measurements on samples with intermediate concentration and high concentration showed liquid-like order and crystalline order respectively. The intensity of the Bragg peak of the crystallized sample when monitored as a function of temperature showed crystal to liquid transition at 26.2 °C and a fluid to fluid transition at 31 °C. The occurrence of melting at a volume fraction of 0.85 and the absence of change in number density across the fluid-to-fluid transition suggest that interparticle interaction is repulsive soft-sphere below the volume phase transition. The reported results on the phase behavior of poly(Nisopropylacrylamide) nanogel suspensions are discussed in the light of the present results.
Materials Sciences and Applications, 2011
The corrosion inhibition method is the technique most used to reduce the cost of corrosion in the... more The corrosion inhibition method is the technique most used to reduce the cost of corrosion in the industrial field, especially in the acidic environment, in which the organic inhibitor has been widely used. For this, the corrosion inhibition of C38 steel in molar hydrochloric acid was examined using N-Propargyl Saccharin (NPS) as an inhibitor. Electrochemical and surface analyzes were performed to identify how this compound inhibits the corrosion of C38. The stark results showed that the inhibitors act as mixed types of inhibitors, reducing the anode and cathode current densities. In addition, this inhibitor improves the resistance to charge transfer of C38 steel, increasing the thickness of the protective layer when the concentration of the inhibitor has been increased. The thermodynamic parameters and the theoretical observations (DFT, MC, and MD) confirm the inhibitor's adsorption interaction with the metal surface.
Currently, energy consumption in the planet is high, public awareness of energy consumption, envi... more Currently, energy consumption in the planet is high, public awareness of energy consumption, environmental protection and steady progress in the deregulation of conventional energy, distributed generation systems (based on hydrogen) have attracted increased interest. Fuel cell (FC) base and high-temperature systems also have great potential in future single-source or multi-source (hybrid- HSE) applications due to their rapid technological development and numerous benefits such as well, as the appreciable efficiency, low emission (greenhouse gases) and flexible modular technology. Dynamic models for the main components of the system, namely the photovoltaic (PV) energy conversion system, fuel cells, electrolysers, electric power interconnection circuits, protective battery, storage tank of hydrogen, the gas compressors are developed. Two renewable energy modes, a photovoltaic field and a solid oxide fuel cell (SOFC) or Dynamics of proton exchange membrane fuel cells (PEMFC) with hydr...
The effect of 3-methyl 4-amino 1,2,4 triazole (MATA) on the corrosion behaviour of copper-nickel ... more The effect of 3-methyl 4-amino 1,2,4 triazole (MATA) on the corrosion behaviour of copper-nickel 70- 30 (Monel) in NaCl 3 % solution is investigated at 298 K by weight loss measurements, potentiodynamic polarisation and impedance spectroscopy (EIS) methods. Preliminary screening of the inhibition efficiency (ECR) was carried out with using weight-loss measurements. Polarization measurements showed that the organic compound investigated is mixed type inhibitor (it acts on the cathodic and the cathodic reactions), inhibiting the corrosion of Monel by blocking the active sites of the metal surface. Changes in the impedance parameters charge transfer resistance (Rct) and double layer capacitance (Cdl) are related to adsorption of organic inhibitor of the metal surface, leading to the formation of protective film, which grows with increasing exposure time. Inhibition efficiencies obtained from cathodic Tafel plots, gravimetric and EIS methods are in good agreement. Results obtained shows...
The effect of 2-mercaptobenzimidazole (2-MBI) on the corrosion of Cu30Ni alloy in NaCl 3% solutio... more The effect of 2-mercaptobenzimidazole (2-MBI) on the corrosion of Cu30Ni alloy in NaCl 3% solution polluted by sulphide ions was studied by weight loss measurements, potentiodynamic polarization and impedance spectroscopy (EIS) methods. It is concludes that the presence of sulphide ions in NaCl 3% accelerates the corrosion of Cu-30Ni alloy. To protect the Cu-30Ni alloy structure from the corrosion in presence of sulphide as pollutants, the anticorrosion effect of 2-mercaptobenzimidazole was examined. The obtained results show that 2-MBI acts as a good mixed-type inhibitor retarding the anodic and cathodic reactions. The inhibitory efficiency determined by the electrochemical measurements increases with immersion time. Received 21 Feb2017, Revised 08 May 2017, Accepted 13 May 2017
Journal of Molecular Liquids
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Papers by Mohammed Benmessaoud