Status : Verified
| Personal Name | Pinque, Marbert D. |
|---|---|
| Resource Title | Photocatalytic hydrogen production via water splitting using 2D-2D MoS2/CdS under visible light irradiation |
| Date Issued | 12 December 2019 |
| Abstract | Development of inexpensive materials for hydrogen production from water and sunlight is one promising route researchers are eyeing on for years. Molybdenum disulfide (MoS2) containing metallic phase (1T) has been one of the good candidates comparable with platinum as hydrogen evolution promoter. The motivation of this study was on giving emphasis on the formation of morphological face contact that enhances charge transfer. 2D MoS2 nanosheets containing 1T and 2H phases (inhomogeneous) and 2D Cadmium sulfide (CdS) sheets/flakes were successfully synthesized using hydrothermal and solvothermal reactions, respectively, and their composites were prepared using physical method (i.e. grinding). These materials were characterized using XRD patterns, XRF semi-quantitative analysis, FTIR spectroscopy, UV-Vis diffuse reflectance spectroscopy, and FE-SEM imaging. The estimated direct band gap of pristine CdS, which was 2.32 eV, was unaffected in the presence of MoS2 indicating the successful adsorption of MoS2 on CdS. CdS alone had a hydrogen production rate of 6.5 μmol/gcath. An apparent synergistic effect of the two materials was observed with a hydrogen production rate of 1036.1 µmol/gcath for the 15wt% MoS2/CdS composite equivalent to 159-fold enhancement of photocatalytic activity. This composite retained ~80% of its photocatalytic activity after 10 hours of use. This work presented an idea on the significance of face contact (2D-2D) between inhomogeneous MoS2 and CdS which can be used for future applications in photocatalysis. This study also provided an applicability of the material if used in the Philippine setting by using the average annual temperature of the country as operating temperature for the reaction. |
| Degree Course | MS Chemical Engineering |
| Language | English |
| Keyword | 2D-2D; Cadmium sulfide; Hydrogen production; Molybdenum disulfide; Photocatalysis |
| Material Type | Thesis/Dissertation |
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