Efficient H2 production over CuCo2S4/g-C3N4 photocatalyst with S-scheme transfer route

Gao, Ting; Li, Chenxi; Yuan, Juan; Tian, Jingzhuo; Sun, Tao; Ma, Haixia; Liu, Enzhou

doi:10.1016/j.ijhydene.2024.02.246

Cited by 8 publications

(3 citation statements)

References 45 publications

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“…According to the standard hydrogen electrode conversion formula E NHE = E SCE + 0.24, the conversion to a general H 2 electrode is −0.58 V. MnSe 2 exhibits a negative slope in its M-S curve, indicating that it is a p-type semiconductor. Since the valence band (VB) of p-type semiconductors is positive 0.20 V than E fb , the E VB value of MnSe 2 is 1.12 V, resulting in a conversion to a standard H 2 electrode of 1.36 V. Additionally, based on the formula E VB = E CB + E g , we obtain E VB and E CB for RP and MnSe 2 as +1.33 and −0.17 V, respectively …”

Section: Resultsmentioning

confidence: 94%

“…Since the valence band (VB) of p-type semiconductors is positive 0.20 V than E fb , the E VB value of MnSe 2 is 1.12 V, resulting in a conversion to a standard H 2 electrode of 1.36 V. Additionally, based on the formula E VB = E CB + E g , we obtain E VB and E CB for RP and MnSe 2 as +1.33 and −0.17 V, respectively. 59 To further investigate the photocatalytic mechanism of the system, nitro tetrazolium blue (NBT) was used as a scavenger to capture •O 2 − . The diminished UV absorption intensity indicates that more •O 2 − was produced in the suspension with light exposure.…”

Section: Photoelectric Properties Analysismentioning

confidence: 99%

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S-Scheme Heterojunctions Formed by MnSe₂ Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H₂ Production

Wang,

Lei,

Sun

et al. 2024

ACS Appl. Nano Mater.

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Efficient photocatalysts possess significant potential for the technology of green hydrogen (H 2 ) production and environmental sustainability. Photocatalytic water splitting represents a promising method for the generation of green H 2 . In this study, cubic MnSe 2 was combined with amorphous RP nanosheets through a simple solvent evaporation method. The results demonstrated that 5 wt % MnSe 2 /RP composite exhibited an optimal H 2 production rate of 940 μmol g −1 h −1 , using Na 2 S/Na 2 SO 3 as a sacrificial agent, under 300 W Xe lamp irradiation, which is 3.5 and 22 times higher than that obtained by pure RP (210 μmol g −1 h −1 ) and MnSe 2 (40 μmol g −1 h −1 ), respectively. Furthermore, the migration paths of MnSe 2 /RP were examined through •O 2 − radical trapping experiments, confirming that the charge transfer between MnSe 2 and RP follows the S-scheme route, which promotes charge separation and provides more active sites for the reduction of H + to H 2 . In addition, the surface composition and structure analysis were analyzed using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, etc. This study presents a promising approach to utilizing selenides as efficient photocatalysts by constructing S-scheme heterojunctions in the field of photocatalysis.

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Section: Resultsmentioning

confidence: 94%

Section: Photoelectric Properties Analysismentioning

confidence: 99%

S-Scheme Heterojunctions Formed by MnSe₂ Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H₂ Production

Wang,

Lei,

Sun

et al. 2024

ACS Appl. Nano Mater.

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“…We know that CdS can enhance the photoresponse of TiO 2 in the visible region, and the redeposition of MoS 2 on CdS/TNAs is mainly used to enhance its photoelectrochemical stability. When the light source is illuminated on the surface of MCT, photogenerated electrons and holes appear in the conduction and valence bands of CdS, respectively, and the electrons in the conduction band of CdS can be transferred to the conduction band of TiO 2 , meanwhile, the holes in the valence band of CdS can migrate to the valence band of MoS 2 , which can then inhibit the photocorrosion of CdS, thus enhancing the photo-stability of CdS [28,29], which will in turn strengthen the photocatalytic performance of the MCT ternary composite nanostructures as a whole.…”

Section: Resultsmentioning

confidence: 99%

Preparation of MoS₂/CdS/TNAs ternary composite structures and study of their photocatalytic properties

Xiong,

Liu,

Duan

et al. 2024

Phys. Scr.

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TiO2 has long been favored by researchers as a representative of semiconductor photocatalysts. Titanium dioxide nanotubes (TNAs) have a larger specific surface area, which makes them more valuable for the design of photocatalyst carriers. CdS is also a typical photocatalytic semiconductor material with a narrow bandwidth, which has a better performance in the visible light region. However, it also has certain problems such as photocorrosion. The composite MoS2 has a better inhibition effect. In this study, MoS2 and CdS were composited on TNAs using electrochemical deposition for the first time, and MoS2/CdS/TNAs (MCT) ternary composite nanostructures were successfully prepared. The effects of electrochemical deposition voltage, reaction time, and the ratios of molybdenum and sulfur sources in the electrolyte on the MCT composite structures were investigated. In this work, the photocatalytic degradation of organic water pollutants was simulated using methylene blue, and the degradation rate reached 93.1% at 150 min. After cycling the degradation experiments for five times, the photocatalysts still had good stability. The results showed that the MCT has good photocatalytic activity, which provides a feasible way for TNAs in the design of photocatalyst carriers.

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MoS2/CuS/g-C3N4 double S-scheme with charge storage ability for efficient photocatalytic H2 production

Xia,

Gao,

et al. 2024

Ceramics International

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Efficient H2 production over CuCo2S4/g-C3N4 photocatalyst with S-scheme transfer route

Cited by 8 publications

References 45 publications

S-Scheme Heterojunctions Formed by MnSe₂ Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H₂ Production

S-Scheme Heterojunctions Formed by MnSe₂ Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H₂ Production

Preparation of MoS₂/CdS/TNAs ternary composite structures and study of their photocatalytic properties

MoS2/CuS/g-C3N4 double S-scheme with charge storage ability for efficient photocatalytic H2 production

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Efficient H2 production over CuCo2S4/g-C3N4 photocatalyst with S-scheme transfer route

Cited by 8 publications

References 45 publications

S-Scheme Heterojunctions Formed by MnSe2 Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H2 Production

S-Scheme Heterojunctions Formed by MnSe2 Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H2 Production

Preparation of MoS2/CdS/TNAs ternary composite structures and study of their photocatalytic properties

MoS2/CuS/g-C3N4 double S-scheme with charge storage ability for efficient photocatalytic H2 production

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Product

Resources

About

S-Scheme Heterojunctions Formed by MnSe₂ Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H₂ Production

S-Scheme Heterojunctions Formed by MnSe₂ Cubic Microparticles Supported on Red Phosphorus Nanosheets as Photocatalyst for H₂ Production

Preparation of MoS₂/CdS/TNAs ternary composite structures and study of their photocatalytic properties