Enhancement of Photocatalytic H₂ Evolution on CdS by Loading MoS₂ as Cocatalyst under Visible Light Irradiation

Abstract

This communication presents our recent results that the activity of photocatalytic H2 production can be significantly enhanced when a small amount of MoS2 is loaded on CdS as cocatalyst. The MoS2/CdS catalysts show high rate of H2 evolution from photocatalytic re-forming of lactic acid under visible light irradiation. The rate of H2 evolution on CdS is increased by up to 36 times when loaded with only 0.2 wt % of MoS2, and the activity of MoS2/CdS is even higher than those of the CdS photocatalysts loaded with different noble metals, such as Pt, Ru, Rh, Pd, and Au. The junction formed between MoS2 and CdS and the excellent H2 activation property of MoS2 are supposed to be responsible for the enhanced photocatalytic activity of MoS2/CdS.

Metal–Organic Framework‐Derived ZnO/ZnS Heteronanostructures for Efficient Visible‐Light‐Driven Photocatalytic Hydrogen Production

“…On the contrary, in composite ZnOS‐60, the ZnS is covered by ZnO and photoexcited holes on the ZnS will not be able to contact with the hole scavengers efficiently 52. The high photocatalytic activity of ZnOS‐30 in comparison with other ZnOS‐n ( n = 15, 45, and 60) may result from the abundant coupling interface between ZnO and ZnS nanoparticles, which improves interfacial charge transfer and therefore effective charge separation 53, 54. In addition, the HER catalytic results match well with the intensities of photocurrent of the materials.…”

Enhanced photoelectrochemical and photocatalytic activities of CdS nanowires by surface modification with MoS2 nanosheets

“…Li et al first reported that the activity of producing H 2 for 0.2 wt% MoS 2 /CdS was enhanced 36 times compared to pristine CdS, which was even higher than 0.2 wt% Pt/CdS under the same reaction conditions [21][22]. Following this work, MoS 2 /CdS nanocomposites with different physical dimensions have been constructed and applied to HER [23][24][25][26][27][28].…”

Selective isolation of the electron or hole in photocatalysis: ZnO–TiO2 and TiO2–ZnO core–shell structured heterojunction nanofibers via electrospinning and atomic layer deposition

“…The design strategy requires that the new generation catalysts should prolong the lifetime of the photo-generated charge carriers to elevate their participation in photocatalytic activity (PCA). For such designs, use of heterostructures is an ideal option, where an electron reservoir from a noble metal 2,7-9 or another semiconductor (heterojunction) 5,14,15 is brought into contact. The former case is exploited in core-shell 7,8,11 and nanocomposite 2,9,10 formats, in which the photo-electrons from the conduction band (CB) of the semiconductor are transferred to the noble metal and then to the catalysis process, while the holes react from the valance band (VB) of the semiconductor.…”