| About this Abstract |
| Meeting |
Materials Science & Technology 2012
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
High Density Branched TiO2 Nanowire Architectures for Efficient Photocatalyzed Water Splitting |
| Author(s) |
Xudong Wang |
| On-Site Speaker (Planned) |
Xudong Wang |
| Abstract Scope |
High density tree-like branched nanowire (NW) architectures are ideal for high-performance PEC electrodes by offering high quality 1D conducting channels for rapid charge transport, and high surface areas for fast interfacial charge transfer and electrochemical reactions. We developed a surface-reaction-limited pulsed chemical vapor deposition (SPCVD) technique that can grow uniform TiO2 NWs inside deep and narrow channels among dense Si NW arrays. The SPCVD technique effectively decouples the crystal growth from precursor vapor concentration, thus makes the conform growth of dense NW arrays inside highly-confined submicron-sized spaces possible. When applied as a PEC anode for water splitting, the 3D TiO2 NR-Si NW architectures yielded a PEC efficiency that is three times higher than that of TiO2 film-coated Si NW arrays. The absorption of TiO2 NRs could be further tuned for visible light photoactivity. Implementing these NW architectures into electrode design can advantageously impact PEC and photovoltaic device performance. |
| Proceedings Inclusion? |
Undecided |