期刊
ACS NANO
卷 7, 期 10, 页码 9375-9383出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn4040876
关键词
photoelectrochemical; TiO2; nanowires; doping; etching; density functional theory
类别
资金
- National Key Basic Research Program of China [2013CB934104, 2012CB921400]
- NSF of China [21322311, 21071033]
- Program for New Century Excellent Talents in University [NCET-10-0357]
- Shanghai Pujiang Program [10PJ1401000]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- NSF of China
- Fudan University
We developed a postgrowth doping method of TiO2 nanowire arrays by a simultaneous hydrothermal etching and doping in a weakly alkaline condition. The obtained tungsten-doped TiO2 core-shell nanowires have an amorphous shell with a rough surface, In which W species are incorporated into the amorphous TiO2 shell during this simultaneous etching/regrowth step for the optimization of photoelectrochemical performance. Photoanodes made of these W-doped TiO2 core-shell nanowires show a much enhanced photocurtent density of similar to 153 mA/cm(2) at 0.23 V vs Ag/AgCl (123 V vs reversible hydrogen electrode), almost 225% of that of the pristine TiO2 nanowire photoanodes. The electrochemical impedance spectroscopy measurement and the density functional theory calculation demonstrate that the substantially improved performance of the dual W-doped and etched TiO2 nanowires Is attributed to the enhancement of charge transfer and the increase of charge carrier density, resulting from the combination effect of etching and W-doping. This unconventional, simultaneous etching and doping of pregrown nanowires is facile and takes place under moderate conditions, and it may be extended for other dopants and host materials with increased photoelectrochemical performances.
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