期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 26, 页码 7806-7815出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta10255f
关键词
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资金
- National Basic Research Program of China [2009CB421601]
- National Science Foundation of China [21175038, 21235002]
Type-II core/shell CdTe/CdS quantum dots (QDs) are assembled onto TiO2 nanotube array (NTA) films using a bi-functional linker molecule with the help of a hydrothermal method coupled with successive ionic layer adsorption and reaction process. Spatial separation of the electron and hole wave functions within the core/shell heterostructured nanocrystals appears to result in an extended charge separation state, resulting in a significant increase in photocurrent and excellent device stability. When only CdS or CdTe QDs are used as the sensitizer, the largest photocurrent densities are 1.31 mA cm(-2) and 1.23 mA cm(-2), respectively. For the core/shell CdTe/CdS QDs sensitized TiO2 NTA photoelectrodes the photocurrent density increases to approximate to 9.17 mA cm(-2), dramatically larger than the values obtained with only one sensitizer. The core/shell CdTe/CdS QDs sensitized TiO2 NTA photoelectrodes provide a remarkable photoelectrochemical cell efficiency of 6.12%. To the best of our knowledge this photoconversion efficiency is the highest in the field of QD-sensitized photoelectrodes. A corresponding hydrogen evolution rate as high as 1560 mu mol h(-1) W-1 was achieved.
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