Nano letters, 2011-11, Vol.11 (11), p.4978-4984
2011
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Details
- Autor(en) / Beteiligte
- Titel
- Branched TiO2 Nanorods for Photoelectrochemical Hydrogen Production
- Ist Teil von
- Nano letters, 2011-11, Vol.11 (11), p.4978-4984
- Ort / Verlag
- Washington, DC: American Chemical Society
- Erscheinungsjahr
- 2011
- Quelle
- MEDLINE
- Beschreibungen/Notizen
- 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/cm2 total power density), the branched TiO2 nanorod array produces a photocurrent density of 0.83 mA/cm2 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 (i) 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.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1530-6984eISSN: 1530-6992DOI: 10.1021/nl2029392Titel-ID: cdi_proquest_miscellaneous_903143758
- Format
- –
- Schlagworte
- Applied sciences, Condensed matter: electronic structure, electrical, magnetic, and optical properties, Cross-disciplinary physics: materials science, rheology, Electromagnetic Fields, Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures, Electronic transport in multilayers, nanoscale materials and structures, Electronics, Exact sciences and technology, Hydrogen - chemistry, Hydrogen - isolation & purification, Light, Materials, Materials science, Materials Testing, Nanoscale materials and structures: fabrication and characterization, Nanostructures - chemistry, Nanostructures - radiation effects, Nanostructures - ultrastructure, Nanotubes, Physics, Titanium - chemistry, Titanium - radiation effects