Ultra-stable visible-light-driven Ag2S/AgI/Ni thin film photocatalyst: Z-scheme photocatalytic mechanism enhances photocatalytic activity
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Published:2021-12-30
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Volume:
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ISSN:1793-6047
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Container-title:Functional Materials Letters
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language:en
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Short-container-title:Funct. Mater. Lett.
Author:
Zhao Di1,
Chen Yu1,
Liu Hongyan1,
Zhang Xinyi1,
Jiang Meiru1,
Chen Xijie1,
Fu Li1,
Li Guihua1,
Fan Aixin1,
Qin Congli1
Affiliation:
1. Faculty of Chemistry and Material Science, Langfang Normal University, Langfang 065000, P. R. China
Abstract
Ag2S/AgI/Ni composite films were prepared by constant current electrodeposition and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and UV-vis diffuse reflectance spectroscopy. Under visible light (> 420 nm), Ag2S/AgI/Ni composite film photocatalyst showed higher photocatalytic (PC) activity in the degradation of rhodamine B (RhB) than a pure Ag2S/Ni film or AgI/Ni film. The composite film demonstrated excellent stability and could be recycled 11 times with an essentially unchanged PC activity. Ag nanoparticles were generated in the PC process and acted as a charge-transfer bridge, forming a [Formula: see text]-scheme composed of Ag2S, Ag, and AgI. This effectively separated the photogenerated electrons and holes, hence providing excellent PC activity and stability to the Ag2S/AgI/Ni composite film.
Funder
National College Students Innovation and Entrepreneurship Training Program
National Natural Science Foundation of China
Education Reform Project of Hebei Province
Publisher
World Scientific Pub Co Pte Ltd
Subject
General Materials Science