Browsing by Subject "SILAR"
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Item Open Access Effect of coumarin concentration on the physical properties of CdO nanostructures(Elsevier, 2014-05) Sahin, B.; Bayansal, F.; Yuksel, M.; Bıyıklı, Necmi; Cetinkara, H. A.In this work, nanostructured CdO films with different coumarin contents in the growth solution were fabricated on glass substrates by the SILAR method. The effects of coumarin content in the bath on optical, structural and morphological properties were studied by means of (UV–vis) spectrophotometer, SEM and XRD analysis. The analysis showed that the band gaps, surface morphologies and XRD peak intensities of the CdO films were found to change with coumarin content. A change in the band gap energy can be attributed to the improvement in crystallinity of the samples. XRD analysis showed that, the films have poly-crystalline structures with decent crystallinity levels.Item Open Access Influence of coumarin as an additive on CuO nanostructures prepared by successive ionic layer adsorption and reaction (SILAR) method(Elsevier, 2013) Bayansal, F.; Şahin, B.; Yüksel, M.; Bıyıklı, Necmi; Çetinkara, H. A.; Güder, H. S.The effect of coumarin doping during the growth of CuO nanostructures by SILAR method has been studied. It was found that coumarin considerably influences the growth process, manipulates the bandgap and modifies the crystallite size of the films. XRD experiments evidenced that with higher coumarin concentrations in the growth solution, the microstrain and dislocation density increased, while the crystallite size of the films decreased. SEM images revealed that the thicknesses of the plate-like nanostructures decreased with increasing coumarin concentration. By UV/vis spectrophotometer analysis it is found that the coumarin concentration affects both the optical band gap and the transmission rate: both the band gap and spectral transmittance values of the films decreased for higher coumarin content. © 2013 Elsevier B.V. All rights reserved.Item Open Access Modification of mesoporous LiMn2O4 and LiMn2−xCoxO4 by SILAR method for highly efficient water oxidation electrocatalysis(Wiley, 2020-06) Karakaya, Irmak; Karadaş, Ferdi; Ulgut, Burak; Dağ, ÖmerIridium, ruthenium, and cobalt oxides are target materials as efficient and stable mesoporous metal oxide electrocatalysts for oxygen evolution reaction (OER). However, they are costly, toxic, and not practical for an efficient OER process. Here, a two‐step method is introduced, based on earth‐abundant manganese; molten salt‐assisted self‐assembly process to prepare mesoporous LiMn2−xCoxO4 (x = 0–0.5) modified electrodes, in which a systematic incorporation of Co(II) into the structure is performed using successive ionic layer adsorption and reaction followed by an annealing (SILAR‐AN) process. Applying SILAR‐AN over a stable m‐LiMn1.6Co0.4O4 electrode improves the OER performance; the Tafel slope and overpotential drop from 66 to 46 mV dec−1 and 304 to 265 mV (at 1.0 mA cm−2), respectively. The performance of the modified electrodes is comparable to benchmark IrO2 and RuO2 catalysts and much better than cobalt oxide electrodes. Electronic interactions between the neighboring Mn and Co sites synergistically amplify the OER performance of the m‐LiMn2−xCoxO4 electrodes. The data are compatible with an eight steps nucleophilic acid‐base reaction mechanism during OER.