Efficient charge transfer at a homogeneously distributed (NH 4 ) 2 Mo 3 S 13 /WSe 2 heterojunction for solar hydrogen evolution

Farabi Bozheyev, Fanxing Xi, Paul Plate, Thomas Dittrich, Sebastian Fiechter, Klaus Ellmer

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Highly (00.1)-textured polycrystalline WSe 2 films are developed as hydrogen evolving photoelectrodes and improved through deposition of a thin ammonium thiomolybdate (NH 4 ) 2 Mo 3 S 13 catalyst film. This semiconducting thiomolybdate forms a heterojunction with the p-type WSe 2 film passivating recombination centers of excited electron-hole pairs at the edges of the (00.1) textured WSe 2 nanoflakes. In addition, thiomolybdate acts as a photoelectrocatalyst at the electrode-aqueous electrolyte interface during light-driven hydrogen evolution. Whereas the photoelectrochemical activity of pure WSe 2 is dominated by charge carrier recombination processes at edge states of the hexagonal nanoflakes, we obtain homogeneous charge transfer across the van der Waals planes concomitant with the passivation of these edge states. A photocurrent density of up to 5.6 mA cm -2 at 0 V vs. RHE is obtained with the proposed homogeneously distributed (NH 4 ) 2 Mo 3 S 13 /WSe 2 heterojunction system under AM 1.5 illumination in the 0.5 M H 2 SO 4 electrolyte. We conclude that homogeneously distributed semiconducting catalysts on the van der Waals planes of WSe 2 nano-crystallites are a feasible strategy towards solar hydrogen evolution with large-area photoelectrocathodes.

Original languageEnglish
Pages (from-to)10769-10780
Number of pages12
JournalJournal of Materials Chemistry A
Volume7
Issue number17
DOIs
Publication statusPublished - Jan 1 2019

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Heterojunctions
Charge transfer
Hydrogen
Electrolytes
Catalysts
Charge carriers
Photocurrents
Ammonium Compounds
Crystallites
Passivation
Lighting
Electrodes
Electrons
tetrathiomolybdate

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Efficient charge transfer at a homogeneously distributed (NH 4 ) 2 Mo 3 S 13 /WSe 2 heterojunction for solar hydrogen evolution . / Bozheyev, Farabi; Xi, Fanxing; Plate, Paul; Dittrich, Thomas; Fiechter, Sebastian; Ellmer, Klaus.

In: Journal of Materials Chemistry A, Vol. 7, No. 17, 01.01.2019, p. 10769-10780.

Research output: Contribution to journalArticle

Bozheyev, Farabi ; Xi, Fanxing ; Plate, Paul ; Dittrich, Thomas ; Fiechter, Sebastian ; Ellmer, Klaus. / Efficient charge transfer at a homogeneously distributed (NH 4 ) 2 Mo 3 S 13 /WSe 2 heterojunction for solar hydrogen evolution In: Journal of Materials Chemistry A. 2019 ; Vol. 7, No. 17. pp. 10769-10780.
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