CUED Publications database

Direct synthesis of all-inorganic heterostructured CdSe/CdS QDs in aqueous solution for improved photocatalytic hydrogen generation

Li, ZJ and Fan, XB and Li, XB and Li, JX and Zhan, F and Tao, Y and Zhang, X and Kong, QY and Zhao, NJ and Zhang, JP and Ye, C and Gao, YJ and Wang, XZ and Meng, QY and Feng, K and Chen, B and Tung, CH and Wu, LZ (2017) Direct synthesis of all-inorganic heterostructured CdSe/CdS QDs in aqueous solution for improved photocatalytic hydrogen generation. Journal of Materials Chemistry A, 5. pp. 10365-10373. ISSN 2050-7488

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Abstract

Here we present a facile aqueous approach to synthesize heterostructured CdSe/CdS QDs with all-inorganic chalcogenide S ligands under mild conditions. High-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and steady-state emission spectroscopy demonstrate that the heterostructured CdSe/CdS QDs with sulfur-rich surface composition are formed by heterogeneous nucleation of Cd and S precursors on the CdSe QDs. After adsorption of small Ni(OH) clusters over the surface in situ, the CdSe/CdS-Ni(OH) photocatalyst enables H production efficiently with an internal quantum yield of 52% under visible light irradiation at 455 nm, up to an 8-fold increase of activity to that of spherical CdSe QDs-Ni(OH) under the same conditions. Femtosecond transient absorption spectroscopy, X-ray transient absorption (XTA) spectroscopy, steady-state and time-resolved emission spectroscopy show that the quasi-type-II band alignment in the CdSe/CdS heterostructure is responsible for the efficiency enhancement of light harvesting and surface/interfacial charge separation in solar energy conversion. The unprecedented results exemplify an easily accessible pattern of aqueous synthesis of all-inorganic heterostructured QDs for advanced photosynthetic H evolution. 2- 2+ 2- 2 2 2 2 2

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 12 Mar 2019 01:19
Last Modified: 15 Apr 2021 05:33
DOI: 10.1039/c7ta01670k