Plasmonically Enhanced Photocatalytic Hydrogen Production from Water: The Critical Role of Tunable Surface Plasmon Resonance from Gold-Silver Nanoshells

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題名:	Plasmonically Enhanced Photocatalytic Hydrogen Production from Water: The Critical Role of Tunable Surface Plasmon Resonance from Gold-Silver Nanoshells
作者:	李岱洲;Li, Chien-Hung;Li, Min-Chih;Liu, Si-Ping;Jamison, Andrew C;Lee, Dahye;Lee, T. Randall;Lee, Tai-Chou
貢獻者:	工學院化學工程與材料工程學系
關鍵詞:	absorption;diameter;electrons;hydrogen;hydrogen production;indium;microwave treatment;photocatalysts;silica;sulfides;surface plasmon resonance;zinc
日期:	2016-04-27
上傳時間:	2026-04-21 14:51:15 (UTC+8)
出版者:	American Chemical Society;United States: American Chemical Society
摘要:	摘要： Gold–silver nanoshells (GS-NSs) having a tunable surface plasmon resonance (SPR) were employed to facilitate charge separation of photoexcited carriers in the photocalytic production of hydrogen from water. Zinc indium sulfide (ZnIn2S4; ZIS), a visible-light-active photocatalyst, where the band gap varies with the [Zn]/[In] ratio, was used as a model ZIS system (E g = 2.25 eV) to investigate the mechanisms of plasmonic enhancement associated with the nanoshells. Three types of GS-NS cores with intense absorptions centered roughly at 500, 700, and 900 nm were used as seeds for preparing GS-NSZIS core–shell structures via a microwave-assisted hydrothermal reaction, yielding core–shell particles with composite diameters of ∼200 nm. Notably, an interlayer of dielectric silica (SiO2) between the GS-NSs and the ZIS photocatalyst provided another parameter to enhance the production of hydrogen and to distinguish the charge-transfer mechanisms. In particular, the direct transfer of hot electrons from the GS-NSs to the ZIS photocatalyst was blocked by this layer. Of the 10 particle samples examined in this study, the greatest hydrogen gas evolution rate was observed for GS-NSs having a SiO2 interlayer thickness of ∼17 nm and an SPR absorption centered at ∼700 nm, yielding a rate 2.6 times higher than that of the ZIS without GS-NSs. The apparent quantum efficiencies for these core–shell particles were recorded and compared to the absorption spectra. Analyses of the charge-transfer mechanisms were evaluated and are discussed based on the experimental findings. 其他題名： ACS Appl. Mater. Interfaces 出版者： United States: American Chemical Society 出版日期： 2016-04-13 出處： ACS applied materials & interfaces, 2016-04, Vol.8 (14), p.9152-9161 資源來源： American Chemical Society Journals 版權： Copyright © 2016 American Chemical Society 識別號： ISSN: 1944-8244 識別號： ISSN: 1944-8252 識別號： EISSN: 1944-8252 識別號： DOI: 10.1021/acsami.6b01197 識別號： PMID: 26973998
顯示於類別:	[化學工程與材料工程學系 ] 期刊論文

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