NLEBEMUO, TOCHUKWU MARTINS and Covenant University, Theses (2020) SYNTHESIS AND CHARACTERIZATION OF TRANSITION METAL COMPLEXES AS POTENTIAL MATERIAL FOR DYE SENSITIZED SOLAR CELL. Masters thesis, COVENANT UNIVERSITY.
![[img]](http://eprints.covenantuniversity.edu.ng/style/images/fileicons/application_pdf.png) |
PDF
Download (263kB) |
Abstract
Novel dye sensitizer materials in Dye-sensitized solar cell need to be found to meet the demand for cleaner energy. This study explores the potential of new metal complexes as possible dye sensitizers. The metal complexes were successfully synthesized using wet chemistry method. The ligands were prepared using 2,4 Dinitrophenyl hydrazine to react with salicylaldehyde, 2-thiophenecarboxaldehyde and 3-pyridinecarboxaldehyde separately in ratio (1:1). The three ligands formed were then reacted with three different metal salts each namely manganese acetate, zinc chloride and strontium chloride in ratio (3:1). The physicochemical properties were gotten by calculation and observation. Selected synthesized compounds (both ligands and metal complexes) were characterized with spectroscopic techniques. The UV-visible spectroscopy of Mn (H1L), Mn (H2L) and Mn (H3L) showed maximum absorption wavelengths at 386 nm, 380 nm and 377 nm respectively. The FT-IR spectroscopy for selected compounds showed peaks around 3631.08 cm-1 , 1614.14 cm-1, 1513.63 cm-1 and 913.13 cm-1 for O-H of alcohol, C=N of hydrazone, N-O of nitro and metalligand bond respectively. The 1H-NMR spectroscopy for selected compounds showed signals between 7.05 ppm-8.50 ppm which suggests that the compounds have aromatic systems. Furthermore, structural and morphological studies were carried out on Mn (H1L) and Mn (H2L) using techniques such as TGA, XRD, SEM and TEM. The thermograph for Mn (H1L) and Mn (H2L) showed a loss of water molecules between 100 oC -120 oC, there was a gradual loss of the ligands between 120 oC-650 oC and finally a total loss of the ligand between 650 oC-800 oC leaving only the metal. The diffractograms of Mn (H1L) and Mn (H2L) showed sharp and intense peaks indicating fine crystalline rhombohedral phase as all peaks were well matched with database in JCPDS (file number: 77-1858). The degree of crystallinity for Mn (H1L) was calculated from the diffractogram to be 89.7% while that of Mn (H2L) was calculated to be 32.0%. The SEM photographs of Mn (H1L) and Mn (H2L) showed that Mn (H1L) crystal-like morphology at the surface agreeing with the high degree of crystallinity from the diffractogram, while Mn (H2L) had an irregular surface morphology. The TEM photograph of Mn (H1L) showed the crystal-like nature within the material. The band gap energy for Mn (H1L), Mn (H2L) and Mn (H3L) was estimated with DRS to be 2.47 eV, 2.48 eV and 2.33 eV respectively.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Transition metal complexes, Dye sensitized solar cell, X-ray diffraction analysis, diffuse reflectance spectroscopy |
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Chemistry |
| Depositing User: | Mrs Hannah Akinwumi |
| Date Deposited: | 20 Oct 2020 11:32 |
| Last Modified: | 20 Oct 2020 11:32 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/13656 |
Actions (login required)
 |
View Item |
