Shedding light on small molecule coumarin dyes for efficient photocatalytic hydrogen evolution

被引:14
作者
Chanda, Nageshwarrao [1 ,6 ]
Gonuguntla, Spandana [2 ]
Verma, Shashi Kant [3 ]
Basak, Ashok K. [3 ]
Soujanya, Yarasi [4 ]
Ahmadipour, Mohsen [5 ]
Bojja, Sreedhar [1 ]
Pal, Ujjwal [2 ,6 ]
机构
[1] Indian Inst Chem Technol, Dept Analyt & Struct Chem, CSIR, Hyderabad 500007, India
[2] CSIR Indian Inst Chem Technol, Dept Energy & Environm Engn DEEE, Hyderabad 500007, India
[3] Banaras Hindu Univ, Inst Sci, Dept Chem, Varanasi 221005, India
[4] CSIR Indian Inst Chem Technol, Polymers & Funct Mat & Fluoro Agrochem Dept, Hyderabad 500007, India
[5] Univ Kebangsaan Malaysia UKM, Inst Microengn & Nanoelect IMEN, Ukm Bangi 43600, Selangor, Malaysia
[6] Acad Sci & Innovat Res AcSIR, Ghaziabad 201002, India
关键词
Coumarin dye; Hydrogen; TiO2; Water splitting; Dye-sensitization; TITANIUM BIPOLAR PLATES; VISIBLE-LIGHT; PHOTOPHYSICAL PROPERTIES; PHOTOSENSITIZER; PERFORMANCE; SENSITIZERS; CATALYSTS; DESIGN;
D O I
10.1016/j.ijhydene.2022.09.108
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The development of simple coumarin-based organic dyes loaded over TiO2 is found to possess great potential for efficient photocatalytic hydrogen generation. Herein, we studied a series of coumarin-based organic dyes, namely, 4-(naphthalene-1-yl)-2-oxo-2H-benzo[h] chromene-3-carbonitrile loaded over Pt-TiO2 is referred to as TC-2. The electronic as well as structural properties of the dyes were visualized experimentally and theoretically with the modification of the structural chromophoric groups over the meso-position of the coumarin dyes and revealed that the meso-substitution of the naphthalene ring over the TC-2 resulted in the decrease in electron-hole recombination dynamics. TC-2 photocatalyst depicted enhanced activity of (H2 rate-5.54 mmolg-1h-1) under neutral pH (AQY-14.5%, TON-5970), which is majorly obtained due to the increased conjugation of the naphthalene ring which thereby increases the light-sorption capacity of the materials in comparison to that of the others, synthesized materials in presence of TEOA. The extended p-p* conju-gation in the substituent modification and the cyano groups over the simple coumarin groups leads to enhanced activity. This work paves the way towards sustainable development of dye-sensitized photocatalysts for green fuel generation.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:37715 / 37724
页数:10
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