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Type :thesis
Subject :QD Chemistry
Main Author :Muqoyyanah
Title :Fabrication of graphene oxide/titanium dioxide hybrid material for solar cell and membrane application
Place of Production :Tanjong Malim
Publisher :Fakulti Sains dan Matematik
Year of Publication :2019
Corporate Name :Universiti Pendidikan Sultan Idris
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Abstract : Universiti Pendidikan Sultan Idris
This study aimed to fabricate graphene oxide (GO)/titanium dioxide (TiO2) hybridbased material for dye-sensitized solar cells (DSSCs) and membrane separation applications. The electrochemical exfoliation assisted by customized triple-tail sodium 1, 4-bis (neopentyloxy)-3-(neopentyloxycarbonyl)-1, 4-dioxobutane-2-sulphonate (TC14) and commercially available single-tail sodium dodecyl sulphate (SDS) surfactants were used to synthesize GO with water-based electrolyte and N, Ndimethylacetamide (DMAc) as solvents. The chemical reduction process utilizing hydrazine hydrate was then performed to produce reduced GO (rGO) which further hybridized with multi-walled carbon nanotubes (MWCNTs). The fabrication of DSSCs counter electrode (CE) was done by spraying deposition method on fluorine-doped tin oxide (FTO) as substrate and also coated by thin platinum (Pt). Meanwhile, different variety of TiO2 nanostructures as DSSCs photoanode were synthesized by hydrothermal growth and squeegee methods with different recepi and synthesis time. On the other hand, the DMAc-based GO was used to fabricate nanofiltration (NF) membrane utilizing polyvinylidene fluoride (PVDF) as the main polymer material by using phase inversion method. The DSSCs and NF membrane samples were characterized using solar simulator and dye rejection test, respectively. The DSSCs finding showed that the highest energy conversion efficiency (1.559%) was achieved by TiO2 NRs-NFs/TC14-rGO/TiO2 NPs as photoanode and TC14-rGO_MWCNTs/Pt as CE with the value of open circuit voltage, short circuit density, and fill factor were 0.747 V, 3.275 mA/cm2, and 53.5, respectively. Meanwhile, the NF membrane finding showed that PVDF/SDS-GO/TiO2 presents the highest dye flux (10.148 L/m2h) and high dye rejection efficiency (~92.76%). In conclusion, the synthesized GO showed a potential to be applied as electrode thin films and also membrane materials. Implication of this study is a novel, simpler, low-cost, and less harsh chemical for the GO synthesis to fabricate CE and photoanode film for DSSCs and also NF membrane.

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