期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 42, 期 36, 页码 22765-22775出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.07.154
关键词
Photocatalysis; AuPd; H-2 evolution; g-C3N4 nanosheets
资金
- National Science Foundation of China [51572295, 21003157, 21273285]
- Beijing Nova Program [2008B76]
- Science Foundation of China University of Petroleum, Beijing [KYJJ2012-06-20, 2462016YXBS05]
AuPd bimetallic nanoparticle (NP) modified ultra -thin graphitic carbon nitride nanosheet photocatalysts were synthesized via photochemical deposition-precipitation followed by hydrogen reduction. The crystal structure, chemical properties, and charge carrier behavior of these photocatalysts were characterized by X-ray diffraction (XRD), surface photovoltage spectroscopy (SPS), transient photovoltage spectroscopy (TPV), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and UV-Vis diffuse-reflectance spectroscopy (DRS). Photocatalytic H-2 evolution experiments indicate that the hydrogen treated AuPd nanoparticles can effectively promote the separation efficiency of electron-hole pairs photo-excited in the g-C3N4 photocatalyst, which consequently promotes photocatalytic H-2 evolution. The 1.0 wt% AuPd/g-C3N4 (H-2) composite photocatalyst showed the best performance with a corresponding photocatalytic H-2 evolution rate of 107 mu mol h(-1). The photocatalyst can maintain most of its photocatalytic activity after four photocatalytic experiment cycles. These results demonstrate that the synergistic effect of light reduction and hydrogen reduction of AuPd and g-C3N4 help to greatly improve the photocatalytic activity of the composite photocatalyst. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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