Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 17, Pages 8314-8320Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402154k
Keywords
heterogeneous nanostructure; water splitting; electron-hole separation; surface photovoltage; quasi-Fermi energy level
Funding
- National Natural Science Foundation of China [21001042, 21101060, 51272070]
- Program for New Century Excellent Talents in University [NCET-11-0958, NCET-11-0959]
- Excellent Youth of Common Universities of Heilongjiang Province [1252G045]
- Natural Science Foundation of Heilongjiang Province [B201003]
- Postdoctoral Research Foundation of Heilongjiang Province [LBH-Q11010, LBH-Q10018]
- Program for Innovative Research Team in University [IRT-1237]
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The TiO2 nanobelt/ZnO nanorod composite photoelectrodes with flower-like and/or grass-like microstructures have been fabricated via a facile solution growth routine, just by controlling the treatment of the TiO2 nanobelt substrate. For the flower-like composite, the ZnO nanorods disperse orientationally on TiO2 nanobelt films, while for the grass-like one, ZnO nanorods grow disorderly like grass on the TiO2 nanobelt film surface. Furthermore, quasi-Fermi energy level changes of both photoelectrodes have been quantitatively characterized by the surface photovoltage based on the Kelvin probe, which clearly reveals the efficiency of photogenerated electron-hole separation. Owing to the decrease of quasi-Fermi energy level, the flower-like TiO2 nanobelt/ZnO nanorod heterogeneous nanostructure presents a high efficiency of photogenerated electron hole separation. Therefore, the flower-like TiO2 nanobelt/ZnO nanorod heterogeneous nanostructure photoelectrode has achieved a better performance of water splitting compared with the grass-like TiO2 nanobelt/ZnO nanorod one.
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