Preparation of MnS with Different Crystal Phases for Photocatalytic H2 Production from H2S

doi:10.15541/jim20170104

Abstract

Abstract:

Cubic α-MnS and hexagonal γ-MnS were successfully prepared by a one-pot solvothermal method. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and UV-Vis absorption spectrum were used to investigate the phase, microstructure, morphology, and optical property of the obtained samples. The photocatalytic H₂ production performances from H₂S of α-MnS and γ-MnS were evaluated both under visible light (λ > 420 nm) and UV-Vis light irradiation. The results revealed that both α-MnS and γ-MnS possess photo-splitting H₂S activity under visible light, and the metastable state γ-MnS showed better photocatalytic H₂ evolution performance (23.38 μmol/(g·h)) than the stable form α-MnS (4.24 μmol/(g·h)). Comparing the photocatalytic activity under visible light, it was found that the hydrogen production rate of α, γ-MnS under the full spectrum irradiation increased remarkably. A maximum H₂ production rate of 2272.69 μmol/(g·h) was achieved over γ-MnS under the full spectrum irradiation. It is noteworthy that during the process of 6 h photocatalytic testing, α, γ-MnS displayed a good stability and resistance to the photocorrosion. In addition, the catalytic mechanism of α, γ-MnS was investigated. Finally, the reason for the difference in photocatalytic activity between these two MnS phases was explored.

Key words: manganese sulfide, photocatalysis, hydrogen sulfide, hydrogen, crystal structure

CLC Number:

TQ174

DAN Meng, ZHANG Qian, ZHONG Yun-Qian, ZHOU Ying. Preparation of MnS with Different Crystal Phases for Photocatalytic H₂Production from H₂S[J]. Journal of Inorganic Materials, 2017, 32(12): 1308-1314.

Figures/Tables 9

Fig. 1 Schematic diagram of photo-splitting H2S reaction equipment

Fig. 2 XRD patterns of MnS sample prepared with pyridine (a) and water (b) as the reaction solvents

Fig. 3 SEM images of samples (a) α-MnS and (b) γ-MnS

Fig. 4 TEM and HRTEM images of the α-MnS (a, b) and γ-MnS (c, d)^Insets are the corresponding SAED patterns

Fig. 5 UV-Vis DRS of MnS sample

Fig. 6 Photocatalytic H2 production of MnSUnder reaction conditions: catalyst, 2.5 mg; light source, 300 W Xe lamp

Table 1 Photocatalytic H2 production under different light irradiation over two different MnS

Samples	H₂ production/(μmol·g^-1·h^-1)
Samples	Visible light (λ>420 nm)	Full spectrum
α-MnS	4.24	877.68
γ-MnS	23.38	2272.69

Fig. 7 Schematic representation of the mechanism for photo- splitting H2S by MnS

Fig. 8 EIS of MnS samples in 0.1 mol/L Na2S and 0.6 mol/L Na2S solution

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Preparation of MnS with Different Crystal Phases for Photocatalytic H₂Production from H₂S

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