高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (6): 20220050.doi: 10.7503/cjcu20220050

• 物理化学 • 上一篇    下一篇

非贵金属三元复合Ni(PO3)2-Ni2P/CdS NPs异质结的构建及可见光高效催化产氢性能

王广琦1, 毕艺洋2, 王嘉博2, 石洪飞2, 刘群2(), 张钰2()   

  1. 1.吉林化工学院材料科学与工程学院
    2.石油化工学院, 吉林 132022
  • 收稿日期:2022-01-21 出版日期:2022-06-10 发布日期:2022-04-10
  • 通讯作者: 刘群,张钰 E-mail:QunLiu@jlict.edu.cn;zhang99yu@jlict.edu.cn
  • 基金资助:
    吉林省科技发展计划项目(20190103117JH)

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)

摘要:

结合异质结构建与共催化剂改性, 以花球状Ni(OH)2为前驱体, 经热磷酸化后得到Ni(PO3)2-Ni2P二元助催化剂, 借助超声化学合成法, 与CdS NPs复合, 形成非贵金属CdS基三元光催化材料Ni(PO3)2-Ni2P/CdS NPs. 以Na2S-Na2SO3为牺牲剂, 在可见光(λ>420 nm)照射下, 在不借助任何贵金属的情况下, 负载量为8%(质量分数)的Ni(PO3)2-Ni2P/CdS NPs复合材料的光催化产氢速率达到4237 μmol·g?1·h?1, 为CdS NPs(217 μmol·g?1·h?1)的19倍. 在产氢循环实验中, 反应进行到第6次循环(18 h)后, 复合材料的产氢速率约为初始的89%, 具有较好的稳定性. 与CdS NPs相比, Ni(PO3)2-Ni2P/CdS NPs的吸收边明显红移, 禁带宽度降至1.86 eV, 并降低了H+还原的过电位, 显示出增强的光吸收性能和适宜的带隙结构. 通过Ni(PO3)2-Ni2P与CdS NPs之间的协同效应, 有效促进了光生载流子的分离, 提高了产氢活性和稳定性.

关键词: 硫化镉纳米粒子, 偏磷酸镍, 磷化镍, 光催化, 产氢

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

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