4.7 Article

Performance and Mechanism of Photoelectrocatalytic Activity of MoSx/WO3 Heterostructures Obtained by Reactive Pulsed Laser Deposition for Water Splitting

Journal

NANOMATERIALS
Volume 10, Issue 5, Pages -

Publisher

MDPI
DOI: 10.3390/nano10050871

Keywords

reactive pulsed laser deposition; molybdenum sulfides; tungsten oxide; photocatalysis; heterostructure; water splitting

Funding

  1. Russian Science Foundation [19-19-00081]
  2. Ministry of Science and Higher Education of the Russian Federation [FZWN-2020-0008]
  3. Russian Science Foundation [19-19-00081] Funding Source: Russian Science Foundation

Ask authors/readers for more resources

This work studies the factors that affect the efficiency of the photoelectrochemical hydrogen evolution reaction (HER) using MoSx/WO3 nano-heterostructures obtained by reactive pulsed laser deposition (RPLD) on glass substrates covered with fluorinated tin oxide (FTO). Another focus of the research is the potential of MoSx nanofilms as a precursor for MoOz(S) nanofilms, which enhance the efficiency of the photo-activated oxygen evolution reaction (OER) using the MoOz(S)/WO3/FTO heterostructures. The nanocrystalline WO3 film was created by laser ablation of a W target in dry air at a substrate temperature of 420 degrees C. Amorphous MoSx nanofilms (2 <= x <= 12) were obtained by laser ablation of an Mo target in H2S gas of varied pressure at room temperature of the substrate. Studies of the energy band structures showed that for all MoSx/WO3/FTO samples, photo-activated HER in an acid solution proceeded through the Z-scheme. The highest photoelectrochemical HER efficiency (a photocurrent density similar to 1 mA/cm(2) at a potential of similar to 0 V under Xe lamp illumination (similar to 100 mW/cm(2))) was found for porous MoS4.5 films containing the highest concentration of catalytically active sites attributed to S ligands. During the anodic posttreatment of porous MoSx nanofilms, MoOz(S) films with a narrow energy band gap were formed. The highest OER efficiency (a photocurrent density similar to 5.3 mA/cm(2) at 1.6 V) was detected for MoOz(S)/WO3/FTO photoanodes that were prepared by posttreatment of the MoSx similar to 3.2 precursor. The MoOz(S) film contributed to the effective photogeneration of electron-hole pairs that was followed by the transport of photoelectrons from MoOz(S) into the WO3 film and the effective participation of holes possessing strong oxidation ability in the OER on the surface of the MoOz(S) film.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available