Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602613
Title: A photoelectrochemical study of CNT /TiO2 nanocomposites synthesised by surfactant-aided sol-gel method
Author: Li, Ziyan
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2013
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Abstract:
The current energy crisis has driven the scientific research in a direction to find alternative options for fossil fuels. Solar energy is the most abundant and suitable for being the mainstream of the future renewable energy amongst other options. Therefore the research on photo-responsive material has been a major part of the solar energy related research. CNT/Ti02 nanocomposite as a promising candidate has attracted significant attention. In this thesis photoelectrochemical study was conducted in order to reveal the properties of the composites. A photoelectrochemical reactor was purposely designed and constructed for the current project after reviewing the design criteria and similar reactors in the literature. The composite synthesis procedure was improved in precision and consistency to ensure the product was more reproducible. The TEM, XRD and TGA data showed that the Ti02 precursors affected the thickness of the · Ti02 layer, the calcination characteristics and hence the CNT content of the final composite. The Ti02 layer was 5 - 10 nm thick and the crystallites were 8 - 10 nm in diameter depends on the type of precursor. A thinner Ti02 coating was found to be beneficial to the suspended photocatalyst whilst the conductivity of the composite was more important to the immobilised composite. It suggested that the CNT content was proportional to the photocurrent level generated and the acid-treated CNTs performed better than raw CNTs. The photocurrent increased significantly with positively increasing the applied potential for all the composites and substrates tested. The electrochemical aspects of the threeelectrode cell were discussed based on the suggested semi-quantitative model for charge transfer across the working electrode. It had shown that the synergetic effect between CNTs and Ti02 were important and strong. These results are valuable for tailoring the CNT/Ti02 or similar nanocomposites to meet specific technological applications in the environmental and renewable energy sectors. I
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.602613  DOI: Not available
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