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Efficient charge transfer at a homogeneously distributed (NH4)2Mo3S13/WSe2 heterojunction for solar hydrogen evolution

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Abstract

Highly (00.1)-textured polycrystalline WSe2 films are developed as hydrogen evolving photoelectrodes and improved through deposition of a thin ammonium thiomolybdate (NH4)2Mo3S13 catalyst film. This semiconducting thiomolybdate forms a heterojunction with the p-type WSe2 film passivating recombination centers of excited electron–hole pairs at the edges of the (00.1) textured WSe2 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 WSe2 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 (NH4)2Mo3S13/WSe2 heterojunction system under AM 1.5 illumination in the 0.5 M H2SO4 electrolyte. We conclude that homogeneously distributed semiconducting catalysts on the van der Waals planes of WSe2 nano-crystallites are a feasible strategy towards solar hydrogen evolution with large-area photoelectrocathodes.

Graphical abstract: Efficient charge transfer at a homogeneously distributed (NH4)2Mo3S13/WSe2 heterojunction for solar hydrogen evolution

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Publication details

The article was received on 31 Jan 2019, accepted on 07 Mar 2019 and first published on 22 Mar 2019


Article type: Paper
DOI: 10.1039/C9TA01220F
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Efficient charge transfer at a homogeneously distributed (NH4)2Mo3S13/WSe2 heterojunction for solar hydrogen evolution

    F. Bozheyev, F. Xi, P. Plate, T. Dittrich, S. Fiechter and K. Ellmer, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA01220F

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