期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 17, 页码 15052-15060出版社
AMER CHEMICAL SOC
DOI: 10.1021/am503044f
关键词
photoreduction; matchlike; ZnO/Au heterostructre; surface plasmon resonance; photoanode; PEC water splitting
资金
- National Science Foundation of China [51202001, 21301001, 21303002]
- Key Project of Anhui Provincial Education Department [KJ2011A021]
- Anhui Provincial Natural Science Foundation [1208085QB43, 1208085QB35, 11040606Q01]
- Research Fund for the Doctoral Program of Higher Education of China [20123401120004]
- Youth Backbone Program of Anhui University
In this paper, we report a novel matchlike zinc oxide (ZnO)/gold (Au) heterostructure with plasmonic-enhanced photoelectrochemical (PEC) activity for solar hydrogen production. The matchlike heterostructure with Au nanoparticles coated on the tip of ZnO nanorods is in situ grown on a zinc (Zn) substrate by using a facile hydrothermal and photoreduction combined approach. This unique heterostructure exhibits plasmonic-enhanced light absorption, efficient charge separation and transportation properties with tunable Au contents. The photocurrent density of the matchlike ZnO/Au heterostructure reaches 9.11 mA/cm(2) at an applied potential of 1.0 V (vs Ag/AgCl) with an Au/Zn atomic ratio of 0.039, which is much higher than that of the pristine ZnO nanorod array (0.33 mA/cm2). Moreover, the solar-to-hydrogen conversion efficiency of this special heterostructure can reach 0.48%, 16 times higher than that of the pristine ZnO nanorod array (0.03%). What is more, the efficiency could be further improved by optimizing the Au content of the heterostructure. The formation mechanism of such a unique heterostructure is proposed to explain the plasmonic-enhanced PEC performance. This study might contribute to the rational design of the visible-light-responsive plasmonic semiconductor/metal heterostructure photoanode to harvest the solar spectrum.
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