高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (12): 3692.doi: 10.7503/cjcu20210508

• 物理化学 • 上一篇    下一篇

不同半导体体系中磷化镍光催化甲酸分解的助催化作用

肖兆忠1,2, 马智1(), 朴玲钰2()   

  1. 1.天津大学化工学院, 天津 300072
    2.中国科学院纳米技术标准化与测量重点实验室, 中国科学院纳米科学卓越中心, 国家纳米科学技术中心, 北京 100190
  • 收稿日期:2021-07-16 出版日期:2021-12-10 发布日期:2021-09-23
  • 通讯作者: 马智 E-mail:mazhi20161016@163.com;piaoly@nanoctr.cn
  • 作者简介:朴玲钰, 女, 博士, 研究员, 主要从事光催化研究. E-mail: piaoly@nanoctr.cn
  • 基金资助:
    国家自然科学基金(21703046)

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)

摘要:

研究了在不同的半导体体系(TiO2, CdS和C3N4)中, Ni2P光催化甲酸(HCOOH)分解制氢的助催化效应. 作为助催化剂, Ni2P与3种半导体形成的复合光催化剂均表现出良好的HCOOH分解制氢活性. Ni2P/TiO2, Ni2P/CdS, Ni2P/C3N4 3种光催化剂最优的产氢活性分别为41.69, 22.45和47.67 μmol·mg-1·h-1, 分别为纯TiO2, CdS和C3N4的3.8倍、 10倍和210倍, 表明Ni2P在光催化HCOOH分解制氢体系中具有普适性. 研究了光催化HCOOH分解制氢的机理, Ni2P的加入使光生电子从半导体转移至Ni2P, 提高了光生电子-空穴对的分离效率; Ni2P还促进了活性物种·OH的生成, 提高了光催化HCOOH分解的产氢速率.

关键词: 光催化, 甲酸分解, 制氢, 机理, 磷化镍

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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