Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 10, Pages 3907-3913Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta10093c
Keywords
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Funding
- National Natural Science Foundation of China (NSFC)
- 973 Program [2014CB932102]
- Fundamental Research Funds for the Central Universities [buctrc201506, YS 1406]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130010110013]
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Recently, layered double hydroxides (LDHs) have emerged as highly active photocatalysts due to their unique structure, large specific surface area and semiconductor properties. However, the slow interfacial kinetics and fast charge recombination are the major obstacles which limit the performance of LDH-based photocatalysts. Here, we demonstrate the doping of rare earth ions into the host layer of LDHs to inhibit the charge recombination and increase the charge injection efficiency simultaneously. A series of terbium ion (Tb3+) doped ZnCr-LDHs (Tb-ZnCr-LDHs) have been successfully synthesized via a co-precipitation method, and their photocatalytic water splitting activities were evaluated under visible light irradiation. The sample with a Tb3+ doping content of 0.5% (molar ratio) shows optimal performance for oxygen evolution (1022 mu mol h(-1) g(-1)) among all these Tb-ZnCr-LDH materials. The photoluminescence and photoelectrochemistry measurements over the Tb-ZnCr-LDH samples prove effective separation of photo-induced charge carriers and high charge injection efficiency, compared with a pristine ZnCr-LDH. This strategy can be applied to modify other photocatalysts toward low-cost solar fuel generation systems.
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