Journal
RSC ADVANCES
Volume 6, Issue 3, Pages 2011-2018Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra23838b
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Funding
- National Basic Research Program of China (973 Program) [2012CB933102]
- Gansu Province Science Foundation for Distinguished Young Scholars [1308RJDA014]
- Longyuan Support Project for Young Creative Talents [4, GANZUTONGZI [2014]]
- Fundamental Research Funds for the Central Universities [lzujbky-2013-66]
- SRF for ROCS, SEM
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MOFs (Metal-Organic Frameworks) have emerged as novel photocatalysts for water reduction but are frequently plagued by their instability when exposed to moist and strongly acidic or alkaline reaction environments. Herein we employed a volatile Fe-based MOF in alkaline solution as precursor to evolve into a magnetic carbonaceous photocatalyst in situ, which demonstrated highly efficient visible-light-driven hydrogen evolution (similar to 125 mu mol H-2 produced within 6 h using 5 mg of MOF precursor) with a quantum efficiency of 1.8% even in the absence of noble metal cocatalyst, indicative of a possible photocatalytic system containing only earth-abundant elements for long-term conversion of solar light into hydrogen energy. The catalyst exhibited an apparent stoichiometric formula of FeO3.3C0.2H1.0 and was determined to be essentially a carbon-metal oxides/oxyhydroxides composite. Laser photolysis and electrochemical measurements were performed to visualize the fundamental multistep electron transfer processes during water reduction, which opens a strategy for the rational design of MOF-derived catalysts to dramatically increase H-2 evolution efficiency.
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