Enhanced Photocatalytic Activity of WS2Film by Laser Drilling to Produce Porous WS2/WO3Heterostructure

Sainan Ma, Longlui Zeng, Lili Tao, Chun Yin Tang, Huiyu Yuan, Hui Long, Ping Kwong Cheng, Yang Chai, Chuansheng Chen, Kin Hung Fung, Xuming Zhang, Shu Ping Lau, Yuen Hong Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)

Abstract

Methods and mechanisms for improvement of photocatalytic activity, are important and popular research topics for renewable energy production and waste water treatment. Here, we demonstrate a facile laser drilling method for engineering well-aligned pore arrays on magnetron-sputtered WS2nanofilms with increased active edge sites; the proposed method promotes partial oxidation to fabricate WS2/WO3heterojunctions that enhance the separation of photogenerated electron-hole pairs. The WS2film after one, two, and three treatments exhibited photocurrent density of 3.9, 6.2, and 8 μA/cm2, respectively, reaching up to 31 times larger than that of pristine WS2film along with greatly improved charge recombination kinetics. The unprecedented combinational roles of laser drilling revealed in this study in regards to geometric tailoring, chemical transformation, and heterojunction positioning for WS2-based composite nanomaterials create a foundation for further enhancing the performance of other 2D transition metal dichalcogenides in photocatalysis via laser treatment.
Original languageEnglish
Article number3125
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 1 Dec 2017

ASJC Scopus subject areas

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