Enhancing electrochemical properties of TiO2 nanotube by incorporation of CdSe quantum dots
Source abstract
Abstract
The present study describes the synthesis of CdSe-incorporated TiO2 nanotubes (CdSe@TNT) via a modified hydrothermal method from CdSe-incorporated spherical TiO2 (CdSe@sTiO2). The structural and photocatalytic activities of both composites are then compared with spherical TiO2 (sTiO2). Quantum dots of CdSe are synthesized by varying Cd:Se precursor ratios and were incorporated into the TiO2 nanotubes (CdSe@TNT) hydrothermally. It is observed that the ratio of Cd:Se used for forming CdSe quantum dots is directly related to the band gap of CdSe@TNT. Reduction in the band gap of TiO2 was confirmed using UV–Vis DRS spectroscopy, and the band gap energy was evaluated to be 3.02 eV, 2.94 eV and 2.89 eV for sTiO2, CdSe@sTiO2 and CdSe@TNT, respectively. XPS peaks reveal elemental peaks of Cd and Se in the TiO2 nanostructure, confirming the formation of the composite. The micro Raman spectroscopy and XRD analysis revealed that structure of TiO2 becomes strained due to incorporation of CdSe in TiO2. The average crystalline sizes of sTiO2, CdSe@sTiO2 and CdSe@TNT are 5.28 nm, 4.36 nm and 2.43 nm, respectively. The morphology of the CdSe@TNT was investigated by HR-TEM. The redesigned interface of heterostructures is further investigated by carrying out the electrochemical properties, and it was observed that the CdSe@TNT heterostructures had a better electrical conductivity. Photocurrent response (I-t) curves for sTiO2, CdSe@sTiO2 and CdSe@TNT reveal that after five cycles, a maximum photocurrent value of 0.0363, 0.0970 and 0.1144 mA cm−2 for sTiO2, CdSe@sTiO2 and CdSe@TNT, respectively, was observed. The photocatalytic efficiency of the synthesized nanomaterial was further investigated using methylene blue dye as a model compound. Graphical Abstract
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · TiO2 Photocatalysis and Solar Cells · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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