Direct evidence of multichannel-improved charge-carrier mechanism for enhanced photocatalytic H2 evolution.

Zhao, Jiangtao, Zhang, Peng, Wang, Zhuo, Zhang, Shijie, Gao, Hongqing, Hu, Junhua and Shao, Guosheng (2017) Direct evidence of multichannel-improved charge-carrier mechanism for enhanced photocatalytic H2 evolution. Scientific reports, 7 (1). p. 16116. ISSN 2045-2322

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Official URL: http://www.nature.com/articles/s41598-017-12203-y

Abstract

In the field of photocatalysis, the high-charge recombination rate has been the big challenge to photocatalytic conversion efficiency. Here we demonstrate the direct evidence of multichannel-improved charge-carrier mechanism to facilitate electron-hole transfer for raising photocatalytic H2 evolution activity. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and UV-Vis diffuse reflectance spectroscopy (DRS), were used to characterize the as-fabricated samples. The result shows that the present design of Au/Pt nanoparticles (NPs) decorated one-dimensional Z-scheme TiO2/WO3 heterostructure composite nanofibers have been fabricated, which even exhibited excellent light absorption in the visible region and greatly enhanced photocatalytic activities on H2 generation comparing with pure TiO2, TiO2/WO3 and Pt/WO3/TiO2 nanofibers. This greatpromotion is mainly on account of the photosynthetic heterojunction system, which include the surface plasmon resonance (SPR) of Au nanoparticles, low overpotential of Pt nanoparticles, and more importantly, the one-dimensional multichannel-improved charge-carrier photosynthetic heterojunction system with Pt as an electron collector and WO3 as a hole collector. Transferring photoinduced electrons and holes at the same time, leading to effective charge separation was directly proved by ultraviolet photoelectron spectroscopy, electrochemical impedance spectroscopy, photocurrent analysis and incident photon-to-electron conversion spectrum.

Item Type: Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
Divisions: University of Bolton Research Centres > Institute for Renewable Energy and Environmental Technologies
SWORD Depositor: JISC Publications Router
Depositing User: JISC Publications Router
Date Deposited: 11 Dec 2017 19:43
Last Modified: 24 Jan 2018 11:16
Identification Number: 10.1038/s41598-017-12203-y
URI: http://ubir.bolton.ac.uk/id/eprint/1237

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