Citation: Lijun Zhang, Xuqiang Hao, Junke Li, Yuanpeng Wang, Zhiliang Jin. Unique synergistic effects of ZIF-9(Co)-derived cobalt phosphide and CeVO₄ heterojunction for efficient hydrogen evolution[J]. Chinese Journal of Catalysis, ;2020, 41(1): 82-94. doi: S1872-2067(19)63454-6 shu

Unique synergistic effects of ZIF-9(Co)-derived cobalt phosphide and CeVO₄ heterojunction for efficient hydrogen evolution

Lijun Zhang ^a,b,c, ,
Xuqiang Hao ^a,b,c ,
Junke Li ^a,b,c ,
Yuanpeng Wang ^a,b,c ,
Zhiliang Jin ^a,b,c

a School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, Ningxia, China;
b Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, Ningxia, China;
c Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, Ningxia, China

Received Date: 16 June 2019
Revised Date: 12 July 2019

Fund Project: This work was financially supported by the National Natural Science Foundation of China (21862002, 41663012), the Graduate Innovation Project of the North Minzu University (YCX19113), the new technology and system for clean energy catalytic production, and Major scientific project of North Minzu University (ZDZX201803).

The photocatalytic decomposition of water to produce hydrogen is an important process, through which solar energy can be converted to chemical energy. Non-precious metal phosphides have quietly attracted attention as an emerging inexpensive photocatalyst. In this study, we reported that a CoP/CeVO₄ hybrid photocatalyst exhibited high hydrogen evolution efficiency owing to EY (eosin Y) sensitization under visible light irradiation for the first time, and the amount of generated hydrogen reached 444.6 μmol in 5 h. The CoP/CeVO₄ nanohybrids were synthesized by a simple chemical precipitation method. The coupling of CoP and CeVO₄ with ZIF-9 as a precursor could be completed in one step. The CeVO₄ particles were firmly attached to the surface of the CoP particles to form a "small point" to "big point" heterojunction. The results of X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, EDX, and transmission electron microscopy showed the formation of CoP and CeVO₄ nanoparticles and the structure of the composite. Based on a detailed analysis of the Mott-Schottky plot, the UV-vis diffuse reflectance spectra, photocurrent-time (it) curve, Tafel curve, Nyquist curve (EIS), linear volt-ampere curve (LSV), and steady-state fluorescence spectra were studied. The time-resolved photoluminescence measurements indicated that the reason for the high-efficiency hydrogen evolution of CoP/CeVO₄ was that the bands of CoP and CeVO₄ were bent due to the existence of the Schottky barrier, and a heterojunction was formed between CoP and CeVO₄, which generated an internal electric field and accelerated the charge transfer. In addition, the synergistic effect between CoP and CeVO₄ provided a new hydrogen-evolution activity center for each of them. The improved carrier separation efficiency and the decrease in the photo-generated recombination rate led to the excellent photocatalytic hydrogen-evolution activity of the CoP/CeVO₄ composite catalyst. This work provides a new strategy for modulating the electronic structure and carrier behavior of transition metal phosphide photocatalysts.
- Photocatalysis,
- CoP,
- CeVO₄,
- Dye-sensitized,
- Hydrogen production
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Unique synergistic effects of ZIF-9(Co)-derived cobalt phosphide and CeVO4 heterojunction for efficient hydrogen evolution

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通讯作者: 陈斌, bchen63@163.com

Unique synergistic effects of ZIF-9(Co)-derived cobalt phosphide and CeVO₄ heterojunction for efficient hydrogen evolution