Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (6): 20220050.doi: 10.7503/cjcu20220050

• Physical Chemistry • Previous Articles     Next Articles

Heterostructure Construction of Noble-metal-free Ternary Composite Ni(PO32-Ni2P/CdS NPs and Its Visible Light Efficient Catalytic Hydrogen Production

WANG Guangqi1, BI Yiyang2, WANG Jiabo2, SHI Hongfei2, LIU Qun2(), ZHANG Yu2()   

  1. 1.School of Materials Science and Engineering
    2.School of Petrochemical Engineering,Jilin Institute of Chemical Technology,Jilin 132022,China
  • Received:2022-01-21 Online:2022-06-10 Published:2022-04-10
  • Contact: LIU Qun,ZHANG Yu E-mail:QunLiu@jlict.edu.cn;zhang99yu@jlict.edu.cn
  • Supported by:
    the Science and Technology Development Program of Jilin Province, China(20190103117JH)

Abstract:

The development of visible-light-driven efficient, stable, and inexpensive photocatalysts for water- splitting hydrogen production is an important topic to address global energy and environmental challenges. In this work, a highly efficient, stable, and non-noble metal CdS-based photocatalytic composite Ni(PO32-Ni2P/CdS NPs was synthesized by combining cocatalyst modification and heterostructure construction strategy. Binary cocatalyst Ni(PO32-Ni2P nanosheet arrays were prepared using flower bulb Ni(OH)2 as precursor by gas-phase sintering phosphating process, and CdS NPs were combined with them to form a new type of ternary composite photocatalyst [Ni(PO32-Ni2P/CdS NPs] by sonochemical. The photocatalytic hydrogen production rate of 8%(mass fraction) Ni(PO32-Ni2P/CdS NPs reaches 4237 μmol·g?1·h?1 with Na2S-Na2SO3 as sacrificial agent under the irradiation of visible light(λ>420 nm), which is about 19 times for CdS NPs(217 μmol·g?1·h?1). In the cycling experiment, the hydrogen production rate of reaction is about 89% of the initial value after sixth cycles(18 h), which demonstrates excellent catalytic stability. Compared with CdS NPs, the absorption edge of Ni(PO32-Ni2P/CdS NPs is obviously red-shifted, the forbidden band width is reduced to 1.86 eV, and the overpotential of H+ reduction is reduced, which exhibits strong light absorption properties and a suitable band gap structure. The photogenerated electrons of CdS NPs are transferred to Ni(PO32-Ni2P through the synergistic effect between Ni(PO32-Ni2P and CdS NPs, which effectively promotes the separation of photogenerated carriers and improves the activity and stability of hydrogen production. This noble-metal-free composite photocatalyst may provide a way to design very efficient water splitting catalysts, which will promotes the practical industrial application of CdS visible photocatalytic water splitting.

Key words: CdS nanoparticles, Ni(PO32, Ni2P, Photocatalysis, Hydrogen evolution

CLC Number: 

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