Abstract:The extent of corrosion inhibition of macrocyclic crown ether compounds namely 2,14-bis(benzo[d]thiazol-2-yl)-6,7,9,10,17,18,20,21-octahydrodibenzo[b,k][1,4,7,10,13,16]hexaoxacy -clo octadecine [BOH] & 2-(6,7,9,10,17,18,20,21-octahydrodibenzo[b,k][1,4,7,10,13,16]hexa oxa cyclooctadecin-2-yl)benzo[d]thiazole [OHB] was investigated experimentally and theoretically on mild steel in 15%...
“…The diffraction peak intensities of the samples in the two groups are not much different, and no other diffraction peaks appear, indicating that the introduction of organic molecules did not destroy the crystal structure of perovskite. These results are in good agreement with the results reported in the previous work [17][18][19]. The XRD pattern is partially enlarged as shown in Figure 2b, the diffraction peak of cesium bromide appears at 20.9 • and the presence of cesium bromide is suppressed with the introduction of organic DC molecules.…”
Section: Crystal Growth and Morphological Analysissupporting
Photovoltaics are being transformed by perovskite solar cells. The power conversion efficiency of these solar cells has increased significantly, and even higher efficiencies are possible. The scientific community has gained much attention due to perovskites’ potential. Herein, the electron-only devices were prepared by spin-coating and introducing the organic molecule dibenzo-18-crown-6 (DC) to CsPbI2Br perovskite precursor solution. The current-voltage (I-V) and J-V curves were measured. The morphologies and elemental composition information of the samples were obtained by SEM, XRD, XPS, Raman, and photoluminescence (PL) spectroscopies. The distinct impact of organic DC molecules on the phase, morphology, and optical properties of perovskite films are examined and interpreted with experimental results. The efficiency of the photovoltaic device in the control group is 9.76%, and the device efficiency gradually increases with the increase of DC concentration. When the concentration is 0.3%, the device efficiency is the best, reaching 11.57%, short-circuit current is 14.01 mA/cm2, the open circuit voltage is 1.19 V, and the fill factor is 0.7. The presence of DC molecules effectively controlled the perovskite crystallization process by inhibiting the in-situ generations of impurity phases and minimizing the defect density of the film.
“…The diffraction peak intensities of the samples in the two groups are not much different, and no other diffraction peaks appear, indicating that the introduction of organic molecules did not destroy the crystal structure of perovskite. These results are in good agreement with the results reported in the previous work [17][18][19]. The XRD pattern is partially enlarged as shown in Figure 2b, the diffraction peak of cesium bromide appears at 20.9 • and the presence of cesium bromide is suppressed with the introduction of organic DC molecules.…”
Section: Crystal Growth and Morphological Analysissupporting
Photovoltaics are being transformed by perovskite solar cells. The power conversion efficiency of these solar cells has increased significantly, and even higher efficiencies are possible. The scientific community has gained much attention due to perovskites’ potential. Herein, the electron-only devices were prepared by spin-coating and introducing the organic molecule dibenzo-18-crown-6 (DC) to CsPbI2Br perovskite precursor solution. The current-voltage (I-V) and J-V curves were measured. The morphologies and elemental composition information of the samples were obtained by SEM, XRD, XPS, Raman, and photoluminescence (PL) spectroscopies. The distinct impact of organic DC molecules on the phase, morphology, and optical properties of perovskite films are examined and interpreted with experimental results. The efficiency of the photovoltaic device in the control group is 9.76%, and the device efficiency gradually increases with the increase of DC concentration. When the concentration is 0.3%, the device efficiency is the best, reaching 11.57%, short-circuit current is 14.01 mA/cm2, the open circuit voltage is 1.19 V, and the fill factor is 0.7. The presence of DC molecules effectively controlled the perovskite crystallization process by inhibiting the in-situ generations of impurity phases and minimizing the defect density of the film.
“…16,18 The O 1s spectrum shows a peak at 532.5 eV ascribed to oxygen bonded to C (Figure S3d). 19 The binding energies of I 3d 3/2 and I 3d 5/2 are centered at 629.9 and 618.3 eV (Figure S3e), respectively, and could be attributed to I − species present in the composite. 20 The peaks for Ag 3d 3/2 (373.6 eV) and Ag 3d 5/2 (367.7 eV) (Figure S3f) and for Pb 4f 5/2 (142.5 eV) and Pb 4f 7/2 (137.7 eV) (Figure S3g) can be attributed to characteristic signals from Pb 2+ and Ag + species, respectively.…”
The
heterometallic Pb-iodoargentate hybrid [Pb(18-crown-6)(PbAg2I6)]
n
(1; 18-crown-6
= 1,4,7,10,13,16-hexaoxacyclooctadecane) was prepared
via self-assembly of the tetrahedal AgI4 and octahedral
PbI6 primary units using crown ether 18-crown-6 as an organic
ligand in DMF solvent. The hybrid heterocomposite cocatalyst based
on 1 and graphitic carbon nitride (g-C3N4) was prepared by a facile solvothermal method. In 1, the dimeric units Ag2I6 and Pb2I10 are joined via face sharing, leading to a ternary
heterometallic 1-D [PbAg2I6
2–]
n
chain containing novel Ag2Pb2I4 cubes. The 1-D chains are joined by the
discoid [Pb(18-crown-6)]2+ complex cations, forming the
2-D [Pb(18-crown-6)(PbAg2I6)]
n
hybrid with the skeleton of [Pb2Ag2I6]
n
. Compound 1 shows
photocatalytic activity in the degradation of MB at room temperature
under visible-light irradiation. The photoelectric response measurement
showed that the photocurrent of 1 increased from 1.41
to 2.43 μA/cm–2 when g-C3N4 was loaded, indicating that the introduction of a certain
amount of g-C3N4 on the surface of 1 improves the separation and migration rate of photoinduced electrons
and holes. The 1/g-C3N4 composite
showed much higher photocatalytic efficiency in comparison to pristine 1 and g-C3N4 for MB degradation, which
suggests the synergistic effect between 1 and g-C3N4 toward visible-light-driven photocatalytic performance.
Meanwhile, the 1/g-C3N4 composite
exhibited good reusability and stability in the photocatalytic reaction.
Free radical quenching experiments showed that the •O2
– radical is the main reactive substance
over catalyst 1, while h+, •OH, and •O2
– species
have synergistic effects over the 1/g-C3N4 composite catalyst in the process of photodegradation.
“…13 D, in presence of CBTC, R max = 156 nm, R q = 20.0 nm, R a = 15.4 nm. The lower value of roughness in presence of inhibitors is because of the adsorption of inhibitor molecules on the MS surface 55 . Figure 13 AFM images for polished ( A ), blank ( B ), with inhibitors MBTC ( C ), and CBTC (D).…”
Anticorrosion and adsorption behaviour of synthesized carbohydrazide Schiff bases, namely (Z)-N′-(4-hydroxy-3-methoxybenzylidene)-6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carbohydrazide(MBTC) and (Z)-N′-(3,4-dichlorobenzylidene)-6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carbohydrazide (CBTC) was examined for mild steel (MS) in 15% HCl medium. The corrosion inhibition study was performed by using gravimetric, thermodynamic, electrochemical and theoretical studies including density functional theory (DFT), molecular dynamic simulation (MDS) and Monte Carlo simulations (MCS). The outcomes in terms of corrosion inhibition efficiency using electrochemical impedance spectroscopy (EIS) method at 303 K and 150 ppm concentration were 96.75% for MBTC and 95.14% for CBTC. Both inhibitors adsorbed on the MS surface through physical as well as chemical adsorption and followed the Langmuir isotherm. The mixed-type nature of both inhibitors was identified by polarization results. Surface analysis was done using FESEM, EDX, AFM and XPS studies and results showed that a protective layer of inhibitor molecules was developed over the surface of MS. The results of DFT, MCS and MDS are in accordance with experimental results obtained by weight loss and electrochemical methods.
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