Publication date: 31st March 2013
TiO2 nanostructures are being extensively studied for the solar energy applications, such as DSSC, QDSSC, photocatalysts and solar water splittings. When working as photoelectrodes in these energy devices, TiO2 nanomaterials with tailored structural complexity and appropriate heterojunction formation will provide new pathways to enhance the performance. My talk will contain two main parts. In the 1st part, I will present our work on the design of TiO2 nanostructures as the photoanodes for photoelectrochemical (PEC) sacrificial water splitting. Examples are nanorods and inverse opals. A smart combination of 3D inverse opal with 1D nanorods allows enhanced light harvesting and higher sensitizer loading. My 2nd part will be on the design of semiconductor photosensitzers to TiO2. Chalcogenide QDs and nanorods are fabricated using either SILAR, ion-exchange reaction, or CVD methods. The strategy of efficiency enhancement will be discussed based on the bandgap and band alignments at the TiO2-sensitzer interfaces. A novel method by combining atomic layer deposition and ion exchange reaction (ALDIER) towards homogeneous coating of photosensitzer on arbitrary TiO2 substrates will be introduced.
1. Li, H. X.; Cheng, C. W.; Li, X. L.; Liu, J. P.; Guan, C.; Tay, Y. Y.; Fan, H. J., Composition-Graded ZnxCd1-xSe@ZnO Core-Shell Nanowire Array Electrodes for Photoelectrochemical Hydrogen Generation. J Phys Chem C 2012, 116, 3802-3807. 2. Cheng, C. W.; Karuturi, S. K.; Liu, L. J.; Liu, J. P.; Li, H. X.; Su, L. T.; Tok, A. I. Y.; Fan, H. J., Quantum-Dot-Sensitized TiO2 Inverse Opals for Photoelectrochemical Hydrogen Generation. Small 2012, 8, 37-42. 3. Luo, J. S.; Ma, L.; He, T. C.; Ng, C. F.; Wang, S. J.; Sun, H. D.; Fan, H. J., TiO2/(CdS, CdSe, CdSeS) Nanorod Heterostructures and Photoelectrochemical Properties. J Phys Chem C 2012, 116, 11956-11963. 4. Karuturi, S. K.; Luo, J. S.; Cheng, C. W.; Liu, L. J.; Su, L. T.; Tok, A. I. Y.; Fan, H. J., A Novel Photoanode with Three-Dimensionally, Hierarchically Ordered Nanobushes for Highly Efficient Photoelectrochemical Cells. Adv Mater 2012, 24, 4157-4162. 5. Luo, J. S.; Karuturi, S. K.; Liu, L.; Su, L. T.; Tok, A. I. Y.; Fan, H. J., Homogeneous Photosensitization of Complex TiO2 Nanostructures for Efficient Solar Energy Conversion. Sci Rep 2012, 2, Artn 451.
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