期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 71, 页码 16270-16276出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201904025
关键词
hydrogen evolution; micelle; photocatalysis; red light; triplet-triplet annihilation upconversion
资金
- National Natural Science Foundation of China [21672226, 21573266, 21673264, 21472201]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
The solar generation of hydrogen by water splitting provides a promising path for renewable hydrogen production and solar energy storage. Upconversion of low-energy photons into high-energy photons constitutes a promising strategy to enhance the light harvesting efficiency of artificial hydrogen production systems. In the present study, upconversion micelles are integrated with Cd0.5Zn0.5S to construct solar energy conversion systems. The upconversion micelle is employed to upconvert red photons to cyan photons. Cd0.5Zn0.5S is sensitized by upconverted cyan light to produce hydrogen, but not by incident red light without triplet-triplet annihilation upconversion (TTA-UC). The performance of the upconversion photocatalytic system was dramatically affected by the concentration of Cd0.5Zn0.5S and the irradiation intensity. This novel system was able to produce about 2.3 mu L hydrogen after 5h of red light (629nm) irradiation (2.4mWcm(-2)). The present study provides a candidate for applications using low-energy photons for solar hydrogen generation.
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