Universität zu Köln

Khan, Sovann, Choi, Heechae ORCID: 0000-0002-9390-6607, Kim, Donghun, Lee, Seung Yong, Zhu, Qiaohong, Zhang, Jinlong, Kim, Seungchul and Cho, So-Hye (2020). Self-assembled heterojunction of metal sulfides for improved photocatalysis. Chem. Eng. J., 395. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 1873-3212

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Abstract

Due to its high redox potential, zinc sulfide (ZnS) is considered an excellent semiconductor photocatalyst. However, the rapid recombination rate of the photogenerated electron-hole pairs limits the efficiency of ZnS for photocatalytic reactions. Herein, we suggest a design rule of heterojunction structure of ZnS for improvement of its photocatalytic performance. Two specific properties are specially emphasized: phase immiscibility and the different growth rates of the component materials. The phase immiscibility not only guarantees a well-separated interface, it also enables the technical convenience of one-pot synthesis. The different growth rates help form wide heterojunctions that foster the efficient consumption of materials. We found that the ZnS/NixSy composite not only meets the aforementioned requirements but also has proper band alignment. Ready-to-use heterojunction photocatalysts (ZnS/NixSy) were obtained via one-pot synthesis, thanks to the different growth rates and the immiscibility of the two sulfides. Combining ZnS with NixSy resulted in substantially improved photocatalytic activity in regard to dye decomposition and H-2 production via water splitting. Both band position measurements and DFT simulations indicated that NixSy is a co-catalyst for ZnS, allowing sufficient band offset for electron-hole separation. Abundant and mass-producible, the ZnS/NixSy composite can effectively substitute for noble metal photocatalysis when it comes to organic pollutant degradation and water splitting.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Khan, Sovann UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Kim, Donghun UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Seung Yong UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhu, Qiaohong UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhang, Jinlong UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Seungchul UNSPECIFIED UNSPECIFIED UNSPECIFIED Cho, So-Hye UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-322309
DOI:	10.1016/j.cej.2020.125092
Journal or Publication Title:	Chem. Eng. J.
Volume:	395
Date:	2020
Publisher:	ELSEVIER SCIENCE SA
Place of Publication:	LAUSANNE
ISSN:	1873-3212
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ROOM-TEMPERATURE FERROMAGNETISM; NICKEL SULFIDE; HYDROGEN-PRODUCTION; H-2 EVOLUTION; ZNS; TIO2; WATER; SURFACE; COCATALYSTS; JUNCTION Multiple languages Engineering, Environmental; Engineering, Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32230