Journal
CHEMSUSCHEM
Volume 8, Issue 7, Pages 1218-1225Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201403334
Keywords
active sites; hydrogen; n-n heterojunction; photocatalysis; water splitting
Funding
- Program of National Natural Science Foundation of China [21371121, 21331004]
- Shanghai Chenguang-project [13CG10]
- Shanghai Nano-Project [12nm0504300]
- Science and Technology Commission of Shanghai Municipality [14DZ2250800]
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In most of the reported n-n heterojunction photocatalysts, both the conduction and valence bands of one semiconductor are more negative than those of the other semiconductor. In this work, we designed and synthesized a novel n-n heterojunction photocatalyst, namely CdS-ZnWO4 heterojunctions, in which ZnWO4 has more negative conduction band and more positive valence band than those of CdS. The hydrogen evolution rate of CdS-30mol%-ZnWO4 reaches 31.46mmolh(-1)g(-1) under visible light, which is approximately 8 and 755 times higher than that of pure CdS and ZnWO4 under similar conditions, respectively. The location of the surface active sites is researched and a plausible mechanism of performance enhancement by the tuning of the structure is proposed based on the photoelectrochemical characterization. The results illustrate that this kind of nonconventional n-n heterojunctions is also suitable and highly efficient for solar hydrogen evolution.
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