Controlling the visible-light driven photocatalytic activity of alloyed ZnSe-AgInSe2quantum dots for hydrogen production

Ping Yen Hsieh, Tatsuya Kameyama, Takayuki Takiyama, Ko Masuoka, Takahisa Yamamoto, Yung-Jung Hsu*, Tsukasa Torimoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Binary semiconductor quantum dots such as CdS and CdSe have been widely studied as photocatalysts for hydrogen production, but the high toxicity of Cd impedes their widespread deployment. Recently, multinary I-III-VI-based semiconductors, e.g., AgInS2 and CuInS2, have emerged as promising alternatives for environmentally benign photocatalysts. In this work, we prepared quantum dots (QDs) composed of an alloyed ZnSe-AgInSe2 (ZAISe) semiconductor and evaluated their photocatalytic activity for hydrogen (H2) production. By individually controlling the fractions of Zn and Ag, that is, the ratios of (Ag + In)/(Zn + Ag + In) and Ag/(Ag + In), the band structure of ZAISe QDs could be finely tuned to improve their photocatalytic activity. The action spectra of the photocatalytic reaction of ZAISe QDs revealed vigorous activity across the whole visible region from 400 to 700 nm. The highest apparent quantum yield of H2 production reached 3.4% under irradiation at 600 nm. This journal is

Original languageEnglish
Pages (from-to)13142-13149
Number of pages8
JournalJournal of Materials Chemistry A
Volume8
Issue number26
DOIs
StatePublished - 14 Jul 2020

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