Citation:
Xianmei Xiang, Lingjun Chou, Xinheng Li. Synthesis of PdS-CdSe@CdS-Au nanorods with asymmetric tips with improved H2 production efficiency in water splitting and increased photostability[J]. Chinese Journal of Catalysis,
;2018, 39(3): 407-412.
doi:
10.1016/S1872-2067(17)62970-X
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Charge separation is a crucial problem in photocatalysis. We used a wet-chemical method to synthesize asymmetrically tipped PdS-CdSe-seeded CdS (CdSe@CdS)-Au nanorod (NR) heterostructures (HCs). In these HCs, electrons and holes are rapidly separated and transported to opposite ends of the NRs by internal electric fields. Their ultraviolet-visible absorption spectra showed strong electronic coupling between both tips and the CdS body. PdS-CdSe@CdS-Au achieved a H2 production rate of ca. 1100 μmol in 5 h; this is two orders of magnitude greater than the rate achieved with Au-CdSe@CdS NRs with only one tip. PdS-CdSe@CdS-Au NRs can withstand 4 h of photoirradiation, compared to 1.5 h for CdSe@CdS NRs, indicating that the photostability of PdS-CdSe@CdS-Au is much better than that of CdS. The greatly improved photocatalytic activity and stability are attributed to efficient charge separation and rapid charge transport in the PdS-CdSe@CdS-Au HCs.
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Keywords:
- Photocatalysis,
- Charge separation,
- Cocatalyst,
- Heterostructure,
- Water splitting
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