MoS₂ Nanosheet‐Modified CuInS₂ Photocatalyst for Visible‐Light‐Driven Hydrogen Production from Water

Abstract

Exploiting photocatalysts respond to visible light is of huge challenge for photocatalytic H2 production. Here, we synthesize a new composite material consisting of few-layer MoS2 nanosheets grown on CuInS2 surface as an efficient photocatalyst for solar H2 generation. The photocatalytic results demonstrate that the 3 wt % MoS2 /CuInS2 photocatalyst exhibits the highest H2 generation rate of 316 μmol h(-1) g(-1) under visible light irradiation, which is almost 28 times higher than that of CuInS2 . Importantly, the MoS2 /CuInS2 photocatalyst shows a much higher photocatalytic activity than that of Pt-loaded CuInS2 photocatalyst. The enhanced photocatalytic activities of MoS2 /CuInS2 photocatalysts can be attributed to the improved charge separation at the interface of MoS2 and CuInS2, which is demonstrated by the significant enhancement of photocurrent responses in MoS2 /CuInS2 photoelectrodes. This work presents a noble-metal-free photocatalyst that responds to visible light for solar H2 generation.

Hierarchical ZnIn2S4/MoSe2 Nanoarchitectures for Efficient Noble‐Metal‐Free Photocatalytic Hydrogen Evolution under Visible Light

“…[12] Generally, noble metals such as Pt have been used as effectivec ocatalysts to modifyp ristine ZnIn 2 S 4 for H 2 evolution. [12,[22][23][24][25][26] Besides MoS 2 , [22][23][24][25][26][27][28][29] other molybdenum-based cocatalysts such as MoP, [30,31] Mo 2 N, [32] and Mo 2 C [33] have been widely used as cocatalysts for the modification of metal-sulfide H 2 -producing photocatalysts. Recently,c arbon-based nanomaterials such as carbon quantum dots, [16] reduced graphene oxide (RGO), [17][18][19] carbon nanofibers, [20] and carbonn anotubes [21] have been demonstrated to be efficient cocatalysts in combination with ZnIn 2 S 4 for photocatalytic H 2 evolution.…”

“…Apart from carbonaceous nanomaterials, cocatalysts such as MoS 2 decorated on ZnIn 2 S 4 also exhibit an excellent promoting effect for photocatalytic H 2 evolution. [12,[22][23][24][25][26] Besides MoS 2 , [22][23][24][25][26][27][28][29] other molybdenum-based cocatalysts such as MoP, [30,31] Mo 2 N, [32] and Mo 2 C [33] have been widely used as cocatalysts for the modification of metal-sulfide H 2 -producing photocatalysts. However,i nc ontrastw ith the aforementioned molybdenum-based or other metal-sulfide-based cocatalysts, metal selenides (particularly MoSe 2 )a re rarely considered as cocatalysts for photocatalytic H 2 generation.…”

Novel MoS 2 -modified AgVO 3 composites with remarkably enhanced photocatalytic activity under visible-light irradiation

“…As displayed in Fig. 3(e) and (f), the binding energies of Mo 3d 5/2 , Mo 3d 3/2 , S 2p 3/2 and S 2p 1/2 peaks appear at 232.5, 235.7 eV, 161.8 and 162.9 eV, respectively, suggesting that the Mo 4+ and S 2-exist in the composite [14]. The results confirm the successful formation of MoS 2 /AgVO 3 composite.…”

“…The characteristic lattice fringes are determined to be about 0.306 nm, which can be ascribed to the (501) plane of AgVO 3 [13]. However, no clear lattice fringes indexed to the planes of MoS 2 can be observed, which is probably due to the low content as well as the weak crystallinity of MoS 2 [14]. The presence of MoS 2 in the MoS 2 /AgVO 3 composite can be further confirmed by the XPS, as discussed below.…”

Co2P Nanorods as an Efficient Cocatalyst Decorated Porous g‐C3N4 Nanosheets for Photocatalytic Hydrogen Production under Visible Light Irradiation

“…All the Co 2 P/g-C 3 N 4 samples render dramatically diminished peak intensity at about 455 nm in comparison with pure g-C 3 N 4 , evincing that the recombination of photoexcited electron-hole pairs is remarkably hindered by Co 2 P. Among all the hybrid samples, the 3Co 2 P/CN sample displays the lowest PL intensity, unveiling the lowest recombination rate of electron-hole www.advancedsciencenews.com www.particle-journal.com pairs, which concurs well with the photocatalytic H 2 evolution activity. [27] Apart from that, the lifetime of charge carriers for g-C 3 N 4 and 3Co 2 P/CN was determined by time-resolved PL (TRPL) analysis. It can be deduced that the average emission lifetime of 3Co 2 P/CN is smaller than that of pure g-C 3 N 4 ( Figure S10, Supporting Information) owing to the rapid injection of electrons from g-C 3 N 4 to Co 2 P at the heterojunction.…”