Journal
ADVANCED MATERIALS
Volume 30, Issue 44, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201803401
Keywords
metal-organic frameworks; solar energy conversion; visible light; water oxidation; water reduction
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Funding
- National Natural Science Foundation of China [21633009, 21522306, 21633010]
- Basic Research Program of China (973 Program) [2014CB239403]
- Dalian Science Foundation for Distinguished Young Scholars [2017RJ02]
- Hundred Talents Program of Chinese Academy of Sciences
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The development of new metal-organic frameworks (MOFs) with dual functions of both water reduction and oxidation under visible-light irradiation is highly desirable for promising solar water splitting, but is not yet reported. Herein, a cadmium-based MOF (denoted as Cd-TBAPy) single crystal with a 2D layered framework by employing 1,3,6,8-tetrakis(p-benzoic acid)pyrene (H(4)TBAPy) as an organic linker is reported, which exhibits good visible-light absorption with edge of approximate to 600 nm. The Mott-Schottky (M-S) measurement and UV-vis analysis integrally reveal that the Cd-TBAPy is an n-type semiconductor with a bandgap of approximate to 2.15 eV whose conduction and valence band are estimated to be -0.05 and 2.10 eV, respectively. Together with loading of Pt or CoPi cocatalyst, the Cd-TBAPy is active for both water reduction and oxidation in the presence of scavengers under visible-light irradiation. Especially, the optimized apparent quantum efficiency for O-2 evolution reaches 5.6% at 420 nm, much higher than that of previous MOF-based photocatalysts reported so far. This is thought to be the first MOF that functions as a photocatalyst for both water reduction and oxidation under visible light, demonstrating the intriguing future of MOF materials in solar-to-chemical energy conversion.
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