Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (12): 3692.doi: 10.7503/cjcu20210508

• Physical Chemistry • Previous Articles     Next Articles

Co-catalytic Effect of Ni2P on Photocatalytic Formic Acid Dehydrogenation over Different Semiconductors

XIAO Zhaozhong1,2, MA Zhi1(), PIAO Lingyu2()   

  1. 1.School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
    2.CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China
  • Received:2021-07-16 Online:2021-12-10 Published:2021-09-23
  • Contact: MA Zhi E-mail:mazhi20161016@163.com;piaoly@nanoctr.cn
  • Supported by:
    the National Natural Science Foundation of China(21703046)

Abstract:

The co-catalytic effect of Ni2P in the field of photocatalytic formic acid dehydrogenation on different photocatalysts(TiO2, CdS and C3N4) was studied. Ni2P as a cocatalyst combined with the three semiconductors showed good activity for hydrogen production from formic acid decomposition. The optimal H2 evolution rate reaches 41.69, 22.45 and 47.67 μmol·mg-1·h-1 under the optimal HCOOH concentration over Ni2P/TiO2, Ni2P/CdS and Ni2P/C3N4 photocatalyst, respectively, which are 3.8, 10 and 210 times greater than those of pure TiO2, CdS and C3N4. The result indicates that Ni2P has universality in photocatalytic decomposition of formic acid for hydrogen production. Finally, the mechanism of photocatalytic hydrogen production was proposed. The introduction of Ni2P significantly accelerates photogenerated electrons transfer from semiconductor to Ni2P and the separation of photogenerated electrons. At the same time, Ni2P promotes the formation of active species ·OH and enhances H2 evolution efficiency. These research results show that nickel phosphide has high hydrogen production activity. It has a good application prospects for constructing an efficient photoca? talytic formic acid dehydrogenation system.

Key words: Photocatalysis, Formic acid dehydrogenation, Hydrogen evolution, Mechanism, Nickel phosphide

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