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Drastically Enhanced Hydrogen Evolution Activity by 2D to 3D Structural Transition in Anion-Engineered Molybdenum Disuflide Thin Films for Efficient Si-based Water Splitting Photocathodes

Abstract

We synthesized transferrable and transparent anion-engineered molybdenum disulfide thin-film catalysts through simple thermolysis method by using [(NH4)2MoS4] solution and powder precursors with different sulphur/phosphorus weight ratios. The synthesized sulphur-doped molybdenum phosphide (S:MoP) thin film changed from two-dimensional van der Waals structure to three-dimensional hexagonal structure by introduction of phosphorus atoms in the MoS2 thin film. The S:MoP thin film catalyst, which is composed of cheap and earth abundant elements, could provide the lowest onset potential and the highest photocurrent density for planar p-type Si photocathode. The density functional theory calculations indicate that the surface of S:MoP thin film absorb hydrogen better than that of MoS2 thin film. The structurally engineered thin film catalyst facilitates the easy transfer of photogenerated electrons from p-Si light absorber to electrolyte. Anion-engineering of MoS2 thin film catalyst would be an efficient way to enhance the catalytic activity for photoelectrochemical water splitting.

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Publication details

The article was received on 04 May 2017, accepted on 08 Jun 2017 and first published on 09 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03845C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Drastically Enhanced Hydrogen Evolution Activity by 2D to 3D Structural Transition in Anion-Engineered Molybdenum Disuflide Thin Films for Efficient Si-based Water Splitting Photocathodes

    K. C. Kwon, S. Choi, J. Lee, K. Hong, W. Sohn, D. M. Andoshe, K. S. Choi, Y. Kim, S. Han, S. Y. Kim and H. W. Jang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03845C

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