F. Wen et al. / Journal of Catalysis 281 (2011) 318–324
323
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
efficient interfacial electron transfer from photoexcited CdS to CoIII
complexes, the broad electronic absorption of photosensitizer CdS,
together with the high catalytic H2 producing activity of CoIII com-
plexes are found to be responsible for the high photocatalytic
activity of this hybrid system. This system bridges the gap between
homogeneous and heterogeneous photocatalysis, and this strategy
can be further extended to various hybrid systems containing
semiconductors and H2 evolution catalysts.
Co(dmgH)2pyCl/CdS in acetonitrile
TON: 171
add 25 µmol Co(dmgH)2pyCl
Acknowledgments
This work was financially supported by the National Basic Re-
search Program of China (Grant No. 2009CB220010), the National
Natural Science Foundation of China (NSFC, Grant Nos. 21090341,
21061140361), the Programme Strategic Scientific Alliances be-
tween China and the Netherlands (Grant No. 2008DFB50130) and
Solar Energy Action Project of Chinese Academy of Sciences (Grant
No. KGCX2-YW-391). The authors thank Dr. Hongxian Han for Eng-
lish revision and helpful suggestions.
0
5
10
15
20
25
30
35
Time (h)
Fig. 6. Time courses of photocatalytic H2 evolution over Co(dmgH)2pyCl/CdS in
acetonitrile solvent showing the stability of the system with re-adding of
Co(dmgH)2pyCl (25 lmol) to the system after irradiation of 17 h. Experiments
were done under visible light irradiation (k > 420 nm). CdS (0.05 g); Co(dmgH)2pyCl
(0.25 mM); 10 vol.% TEOA (total solution volume 100 mL, 0.75 M); 10 vol.% H2O
(total solution volume 100 mL); 80 vol.% acetonitrile (total solution volume
100 mL); light source, Xe lamp (300 W).
Appendix A. Supplementary material
Supplementary data associated with this article can be found, in
Table 3
Rate and QE of photocatalytic H2 evolution over different photocatalysts.
References
a
Photocatalysts
H2 evolution rate (
l
mol hꢁ1
)
QE (%)
CdS
Co/CdS
0.1 wt.% Pt/CdS
Co(dmgH)2pyCl/CdS
4.4
13.7
36.9
0.08
0.25
0.67
2.1
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0
0.00
0.05
0.10
[Co] (mM)
tot
0.15
0.20
0.25
100
0
0.00
0.02
0.04
mM2
0.06
[Co]2
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Fig. 7. Initial H2 evolution rates as a function of ½Coꢃtotal (inset: initial H2 evolution
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photocatalytic system, which is composed of semiconductor CdS as
photosensitizer and CoIII complexes as H2 evolution catalysts. The