Citation: CHAO Ming-Kun, MA Gui-Jun. Flux-Assisted Preparation of Sm₂Ti₂S₂O₅ Powder Applied to Photocatalytic H₂ Production from Water[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(1): 16-22. doi: 10.11862/CJIC.2021.006 shu

Flux-Assisted Preparation of Sm₂Ti₂S₂O₅ Powder Applied to Photocatalytic H₂ Production from Water

CHAO Ming-Kun ^1,2,3 ,
MA Gui-Jun ^1,,

1.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
2.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: MA Gui-Jun, magj@shanghaitech.edu.cn
Received Date: 16 June 2020
Revised Date: 11 September 2020

Figures(9)

Sm₂Ti₂S₂O₅ (STSO) was prepared by a flux method using TiO₂, TiS₂ and Sm₂O₃ as reactants, and eutectic of LiCl and KCl (LiCl-KCl) or LiCl and CsCl (LiCl-CsCl) as flux. By analyzing X-ray diffraction patterns of the samples synthesized at different temperatures, it was firstly demonstrated that the threshold crystallization temperature of STSO was 520℃, much lower than the value of 650℃ that was reported previously as the lowest temperature for synthesizing STSO. Scanning electron microscope images showed that the synthesized STSO particles owned a platelike morphology. At the same temperature, LiCl-CsCl led to lower plate thickness than LiCl-KCl. The average photocatalytic H₂ production rate showed volcano-like profile to synthesizing temperature, which was likely due to the effect of particle size and crystallinity on activity. Variation of hole sacrificial reagent showed that ascorbic acid produced much higher H₂ evolution activity than Na₂S-Na₂SO₃, triethylamine, triethanolamine and methanol. For the purpose of comparing with the literatures, Na₂S-Na₂SO₃ was employed as sacrificial reagent in the following stability test. It was found that the as-prepared STSO exhibited stable H₂ production over 20 h under visible light (Xe lamp, λ>420 nm) irradiation, and having nearly identical characterization results in XPS, XRD and TEM before and after photocatalytic reaction.
- flux method,
- Sm₂Ti₂S₂O₅,
- crystallization temperature,
- photocatalysis,
- hydrogen
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沈阳化工大学材料科学与工程学院沈阳 110142

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Flux-Assisted Preparation of Sm₂Ti₂S₂O₅ Powder Applied to Photocatalytic H₂ Production from Water