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Controlling Cu2ZnSnS4 photocatalytic ability through alterations in sulfur availability ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
53369 46964 2016 7 PDF Available
Title
Controlling Cu2ZnSnS4 photocatalytic ability through alterations in sulfur availability ☆
Abstract

•Synthesis of Cu2ZnSnS4 nanocrystals in a one-pot solvothermal process was tuned by changing free- and ligand-bound-S.•The photocatalysis of methyl viologen (MV) from MV2+ to MV+ state by CZTS was used as the probe to test the photovoltaic nature.•Increased long-range crystal order resulted from slow-release ligand-bound-S leads to an enhanced photocatalytic response.•Optical band gap tuning was achieved by controlling S-release of the ligand-bound-S.•XAFS is another powerful tool in addition to other synchrotron spectroscopy techniques for energy materials.

Cu2ZnSnS4 (CZTS) nanocrystals (NCs) were made via a one-pot solvothermal method with various amounts of available free-sulfur and a fixed amount of sulfur bound to 2-mercapto-5-n-propylpyrimidine (MPP). Varying the sulfur availability yields CZTS NCs of different stoichiometry, from which five distinct samples were analyzed for consistency both microscopically and macroscopically. As revealed by X-ray absorption fine structure investigation, samples fabricated in the presence of decreased free-sulfur showed decreased CZTS character, with sporadic compositions and no long term order; however, when fabricated in the presence of no free-sulfur, sulfur from the degraded MPP was found incorporated into the CZTS structure. These NCs showed improved long-term order over standard synthetic procedure. The catalysis of methyl viologen (MV) from MV2+ to MV+ state by CZTS under light irradiation was used as the probe to test the photovoltaic nature. The photocatalysis was enhanced in the films made from NCs fabricated without available free-sulfur. This enhancement is consistent with the measured band gaps, with more ordered NCs showing a band gap that better matches the most intense regions of the solar spectrum.

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Keywords
Cu2ZnSnS4 (CZTS); Synchrotron spectroscopy; X-ray absorption fine structure; Photocatalysis; X-ray diffraction; Optical band gap
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Controlling Cu2ZnSnS4 photocatalytic ability through alterations in sulfur availability ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 260, 1 February 2016, Pages 119–125
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us