Organic blue-colored D-A-π-A dye-sensitized TiO2 for efficient and stable photocatalytic hydrogen evolution under visible/near-infrared-light irradiation

Haoran Ding, Mengyu Xu, Shicong Zhang, Fengtao Yu, Kangyi Kong, Zhongjin Shen and Jianli Hua

Renewable Energy, 2020, vol. 155, issue C, 1051-1059

Abstract: Photocatalytic splitting of water by titanium dioxide (TiO2) is considered as the most promising approach for the production of hydrogen fuel. However, a low utilization of the solar light spectrum still limits its photoconversion efficiency. Herein, two indeno[1,2-b]thiophene-based organic sensitizers (S5 and S6) are used to sensitize TiO2 to significantly enhance photocatalytic hydrogen production by broadening the spectral response to near-infrared-light region. The results revealed that the average H2 evolution rates of S5@Pt/TiO2 and S6@Pt/TiO2 were 21.5 mmol g−1 h−1 and 7.2 mmol g−1 h−1, which were 11.3 and 3.9 fold than that of the Pt/TiO2 (1.85 mmol g−1 h−1), respectively. Compared with donor-π-acceptor (D−π−A) dye S6, donor−acceptor−π−acceptor (D-A-π-A) blue-colored dye S5 possesses evident dominant in sensitizing TiO2, in which the auxiliary acceptor 2, 3-diphenylquinoxaline (QT) of S5 can effectively disperse donor electron distribution to improve the photo-stability and weak the deprotonation effect to enhance light-harvesting. More importantly, a highly apparent quantum efficiency (AQY) of 2.8% for S5@Pt/TiO2 was obtained at λ = 700 nm monochromatic light, which is, to the best of our knowledge, a recorded value among the pure organic dye-sensitized TiO2 systems. This study offers important insights into the rational design of D-A-π-A organic dye to sensitize TiO2 for highly efficient and stable photocatalytic hydrogen evolution.

Keywords: Photocatalytic H2 production; D-A-π-A; Blue dye; Near-infrared light (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148120305371
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:155:y:2020:i:c:p:1051-1059

DOI: 10.1016/j.renene.2020.04.009

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().