Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803889
Keywords
near-infrared; photoelectrochemical; plasmon enhancement; solar-to-hydrogen; surface photovoltage
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Funding
- National Natural Science Foundation of China [51631001, 51702016, 51872030, 51501010, 21643003]
- Fundamental Research Funds for the Central Universities
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In this communication, light harvesting and photoelectrochemical (PEC) hydrogen generation beyond the visible region are realized by an anisotropic plasmonic metal/semiconductor hybrid photocatalyst with precise control of their topology and heterointerface. Controlling the intended configuration of the photocatalytic semiconductor to anisotropic Au nanorods' plasmonic hot spots, through a water phase cation exchange strategy, the site-selective overgrowth of a CdSe shell evolving from a core/shell to a nanodumbbell is realized successfully. Using this strategy, tip-preferred efficient photoinduced electron/hole separation and plasmon enhancement can be realized. Thus, the PEC hydrogen generation activity of the Au/CdSe nanodumbbell is 45.29 mu mol cm(-2) h(-1) (nearly 4 times than the core/shell structure) beyond vis (lambda > 700 nm) illumination and exhibits a high faradic efficiency of 96% and excellent stability with a constant photocurrent for 5 days. Using surface photovoltage microscopy, it is further demonstrated that the efficient plasmonic hot charge spatial separation, which hot electrons can inject into CdSe semiconductors, leads to excellent performance in the Au/CdSe nanodumbbell.
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