期刊
NANO ENERGY
卷 2, 期 3, 页码 351-360出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2012.10.010
关键词
Branched nanowires (b-NWs); Heterojunction photoanode; Photoelectrochemical cells (PECs); Solar water splitting
类别
资金
- DOE [DE-FG36-08G018016]
- NSF [ECCS0901113, CBET1236155]
- ONR-DURIP [N00014-08-1-0776]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1236155] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0901113] Funding Source: National Science Foundation
We report a successful fabrication of hierarchical three-dimensionally branched TiO2/Si nanowire arrays and their application as the photoelectrochemical electrode for solar water splitting. The branched TiO2/Si nanowire arrays improved the photoelectrochemical (PEC) performance compared to TiO2 thin film-coated Si nanowire arrays because of the substantially increased surface area for electrochemical reactions and enhanced charge transfer kinetics. Wavelength-dependent photocurrent response of the branched nanowire array indicates a strong response in the ultraviolet region (<400 nm), while a negligible photocurrent is observed under visible illumination, primarily caused by the high overpotential loss of n-Si photoanode and energy band configuration of the TiO2/Si heterojunction. The working mechanism based on recombination at this heterogeneous n-n junction is proposed. This study provides insights on the fundamental understanding and potential optimizations of nanoscale hierarchical 3D structured devices for renewable energy applications. Published by Elsevier Ltd.
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