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Efficient Plasmonic Au/CdSe Nanodumbbell for Photoelectrochemical Hydrogen Generation beyond Visible Region
Author(s) -
Wang Hongzhi,
Gao Yuying,
Liu Jia,
Li Xinyuan,
Ji Muwei,
Zhang Erhuan,
Cheng Xiaoyan,
Xu Meng,
Liu Jiajia,
Rong Hongpan,
Chen Wenxing,
Fan Fengtao,
Li Can,
Zhang Jiatao
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201803889
Subject(s) - materials science , plasmon , photocurrent , semiconductor , photocatalysis , nanorod , water splitting , visible spectrum , optoelectronics , photoinduced charge separation , surface photovoltage , hydrogen production , nanotechnology , hydrogen , artificial photosynthesis , physics , chemistry , spectroscopy , biochemistry , quantum mechanics , catalysis
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 µmol cm −2 h −1 (nearly 4 times than the core/shell structure) beyond vis (λ > 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.