Corrosion protection characteristics of ceramics, porphyrins and hybrid ceramics/porphyrins, deposited as single and sandwich layers, by pulsed laser deposition (PLD)

Bîrdeanu, Aurel Valentin; Bîrdeanu, Mihaela; Fagadar‐Cosma, Eugenia

doi:10.1016/j.jallcom.2017.02.221

Cited by 21 publications

(9 citation statements)

References 40 publications

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“…Porphyrin derivatives, designed to easily distort their planar geometry, are highly recognised for their capacity to act as sensitive materials in formulations of optical [ 1 , 2 ], fluorescent [ 3 , 4 ], potentiometric [ 5 , 6 ] and electrochemical sensors [ 7 , 8 ]. More structures of diversely substituted porphyrins and metalloporphyrins proved their utility in acting as corrosion inhibitors for carbon–steel devices, working in both saline [ 9 , 10 , 11 ] and aggressive acid media [ 12 , 13 ]. Recently, as the global energy demand increases, and because hydrogen is considered to be a sustainable choice [ 14 , 15 ], its generation via the electrochemical water splitting method [ 16 , 17 ] involves porphyrins and metalloporphyrins as catalytic materials [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

One A3B Porphyrin Structure—Three Successful Applications

et al. 2022

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Porphyrins are versatile structures capable of acting in multiple ways. A mixed substituted A3B porphyrin, 5-(3-hydroxy-phenyl)-10,15,20-tris-(3-methoxy-phenyl)-porphyrin and its Pt(II) complex, were synthesised and fully characterised by 1H- and 13C-NMR, TLC, UV-Vis, FT-IR, fluorescence, AFM, TEM and SEM with EDX microscopy, both in organic solvents and in acidic mediums. The pure compounds were used, firstly, as sensitive materials for sensitive and selective optical and fluorescence detection of hydroquinone with the best results in the range 0.039–6.71 µM and a detection limit of 0.013 µM and, secondly, as corrosion inhibitors for carbon–steel (OL) in an acid medium giving a best performance of 88% in the case of coverings with Pt-porphyrin. Finally, the electrocatalytic activity for the hydrogen and oxygen evolution reactions (HER and OER) of the free-base and Pt-metalated A3B porphyrins was evaluated in strong alkaline and acidic electrolyte solutions. The best results were obtained for the electrode modified with the metalated porphyrin, drop-casted on a graphite substrate from an N,N-dimethylformamide solution. In the strong acidic medium, the electrode displayed an HER overpotential of 108 mV, at i = −10 mA/cm2 and a Tafel slope value of 205 mV/dec.

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Section: Introductionmentioning

confidence: 99%

One A3B Porphyrin Structure—Three Successful Applications

et al. 2022

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“…The surface roughness was measured on a surface area of approximately 1.326 pm 2 and was determined from the values of Sa (average roughness) and Sq (the mean square root roughness). Topographical parameters Sp (the maximum peak height deviation of the roughness) and Sv (the maximum valley depth deviation of the roughness) were used for the calculation of the layers’ thicknesses [ 22 , 24 , 25 ]. All the obtained data are presented in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

Self-Powered Photodetector Based on FTO/n-TiO2/p-CuMnO2 Transparent Thin Films

et al. 2022

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A self-powered photodetector with the FTO/n-TiO2/p-CuMnO2 configuration, representing the novelty of the work, was successfully achieved for the first time and presumes two steps: deposition of the n-type semiconductor (TiO2) by the doctor blade method and of the p-type semiconductor (CuMnO2) by the spin coating technique, respectively. Investigation techniques of the structural and morphological characteristics of the as-synthesized heterostructures, such as XRD, UV-VIS analysis, and SEM/EDX and AFM morphologies, were used. The I-t measurements of the photodetector showed that the responsivity in the self-powered mode was 2.84 × 107 A W−1 cm2 and in the 1 V bias mode it was 1.82 × 106 A W−1 cm2. Additionally, a self-powered current of 14.2 nA was generated under UV illumination with an intensity of 0.1 mW/cm2. Furthermore, under illumination conditions, the response time (tres) and the recovery time (trec) of the sensor exhibited a good response; thus, tres = 7.30 s and trec = 0.4 s for the self-powered mode, and in the 1 V bias mode, these were tres = 15.16 s and trec = 2.18 s. The above results show that the transparent heterojunction device of n-TiO2/p-CuMnO2 exhibited a self-powered ultraviolet photodetector with high sensitivity.

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“…In the last decade, our group has conducted successful research regarding the synergism between pseudo-binary oxides and porphyrins or metalloporphyrins deposited in alternating sandwich layers on steel with the purpose of inhibiting its corrosion even in extremely aggressive acidic environments. The corrosion inhibition mechanism was achieved by covering the steel surfaces with extremely adherent mixed layers of pseudo-binary oxides and porphyrins, thus creating a protective mechanical barrier [ 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Decrease in Corrosion of Steel in 0.1 M HCl Medium Realized by a Coating with Thin Layers of MnTa2O6 and Porphyrins Using Suitable Laser-Type Approaches

et al. 2022

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The purpose of this research is to meet current technical and ecological challenges by developing novel steel coating systems specifically designed for mechanical equipment used in aggressive acid conditions. Homogeneous sandwich-type layered films on the surface of steel electrodes were realized using a pseudo-binary oxide, MnTa2O6, and two different substituted porphyrin derivatives, namely: 5-(4-carboxy-phenyl)-10,15,20-tris (4-methyl-phenyl)-porphyrin and 5-(4-methyl-benzoate)-10,15,20-tris (4-methyl-phenyl)-porphyrin, which are novel investigated compound pairs. Two suitable laser strategies, pulsed laser deposition (PLD) and matrix-assisted pulsed laser evaporation (MAPLE), were applied in order to prevent porphyrin decomposition and to create smooth layers with low porosity that are extremely adherent to the surface of steel. The electrochemical measurements of corrosion-resistant coating performance revealed that in all cases in which the steel electrodes were protected, a significant value of corrosion inhibition efficiency was found, ranging from 65.6 to 83.7%, depending on the nature of the porphyrin and its position in the sandwich layer. The highest value (83.7%) was obtained for the MAPLE/PLD laser deposition of 5-(4-carboxy-phenyl)-10,15,20-tris (4-methyl-phenyl)-porphyrin/MnTa2O6(h), meaning that the inhibitors adsorbed and blocked the access of the acid to the active sites of the steel electrodes.

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Corrosion protection characteristics of ceramics, porphyrins and hybrid ceramics/porphyrins, deposited as single and sandwich layers, by pulsed laser deposition (PLD)

Cited by 21 publications

References 40 publications

One A3B Porphyrin Structure—Three Successful Applications

One A3B Porphyrin Structure—Three Successful Applications

Self-Powered Photodetector Based on FTO/n-TiO2/p-CuMnO2 Transparent Thin Films

Efficient Decrease in Corrosion of Steel in 0.1 M HCl Medium Realized by a Coating with Thin Layers of MnTa2O6 and Porphyrins Using Suitable Laser-Type Approaches

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