Branched TiO2 Nanorods for Photoelectrochemical Hydrogen Production
- Title
- Branched TiO2 Nanorods for Photoelectrochemical Hydrogen Production
- Author
- 김동립
- Keywords
- TiO2; nanorods; branched nanorods; photoanode; photoelectrochemical hydrogen production; charge transport/transfer
- Issue Date
- 2011-10
- Publisher
- AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
- Citation
- NANO LETTERS; NOV 2011, 11 11, p4978-p4984, 7p.
- Abstract
- We report a hierarchically branched TiO2 nanorod structure that serves as a model architecture for efficient photoelectrochemical devices as it simultaneously offers a large contact area with the electrolyte, excellent light-trapping characteristics,, and a highly conductive pathway for charge carrier collection. Under Xenon lamp illumination (UV spectrum matched to AM 1.5G, 88 mW/cm(2) total power density), the branched TiO2 nanorod array produces a photocurrent density of 0.83 mA/cm(2) at 0.8 V versus reversible hydrogen electrode (RHE). The incident photon-to-current conversion efficiency reaches 67% at 380 nm with an applied bias of 0.6 V versus RHE, nearly two times higher than the bare nanorods without branches. The branches improve efficiency by means of (0 improved charge separation. and transport within the branches due to their small diameters, and (ii) a 4-fold increase in surface area which facilitates the hole transfer at the TiO2/electrolyte interface.
- URI
- https://pubs.acs.org/doi/abs/10.1021/nl2029392http://hdl.handle.net/20.500.11754/40131
- ISSN
- 1530-6984; 1530-6992
- DOI
- 10.1021/nl2029392
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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