Quantum Dot and Nanorod Sensitization on TiO2 1D and 3D Nanostructures for Sacrificial Water Splitting
Jingshan Luo a, Hong Jin Fan a, Siva Krishna Karuturi b, Alfred Iing Yoong Tok b
a School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Nanyang Link, 21, Singapore, Singapore
b NTU Singapore - Nanyang Technological University, School of Materials Science and Engineering, Nanyang Avenue, 50, Singapore, Singapore
Invited Speaker, Jingshan Luo, presentation 001
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.

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