期刊
CHEMICAL ENGINEERING JOURNAL
卷 362, 期 -, 页码 658-666出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.01.073
关键词
ZnO; CdS; PbS; Multi-heterojunction; Photoelectrochemical hydrogen evolution; Visible light
资金
- National Natural Science Foundation of China [21802046]
- Scientific Foundation of Guangdong Province [2017A030313090, 2018A0303130018]
- Guangdong Provincial Science and Technology Project [2016A010104013]
High performance, low cost and sustainable photocatalytic evolution of hydrogen is a promising energy supply alternative for modern society to resolve the depletion crisis of fossil fuel. The design of multi-heterojunction visible-light photocatalysts combined with electrochemical means is considered one of the most attractive options in recent years. In this work, a photoanode composed of top-opened ZnO/CdS/PbS nanotube arrays (ZnO/CdS/PbS ONTs) with multi-heterojunctions was synthesized via a three-step process, i.e. hydrothermal treatment, chemical bath deposition and successive ionic layer adsorption reaction (SILAR). This as-prepared photoanode exhibited remarkable photoelectrochemical activity under visible light irradiation. The photocurrent density and photoelectrochemical hydrogen evolution efficiency of the optimized ZnO/CdS/PbS ONTs reached up to 14.2 mA cm(-2) and 5.5 mL cm(-2) h(-1) at 0.0 V vs. Ag/AgCl, respectively. The efficiency was 3.1 times that of top-closed ZnO/CdS nanotubes (1.8 mL cm(-2) h(-1)). The experimental results suggest that the high photoelectrochemical activity can be ascribed to the inherent advantages of the structural and successive energy level relays design: on the one hand, the top-opened nanotube structure significantly enlarges surface area of the nanostructure, which facilitates efficient light absorption and rapid mass transport; on the other hand, the well-matched band energy edge of the multi-heterojunction interfaces literally build efficient electron highways to deliver electrons to reaction sites and reduce the recombination of photogenerated charge carriers.
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