Article history: Four silver chalcogen compounds, Ag O, Ag S, Ag Se and Ag Te, can be utilized as visible-light-driven 2 2 2 2 Received 12 July 2017 photocatalysts. In this research, the electronic structures of these compounds were analyzed by simula- Received in revised form 4 August 2017 tion and experiments to systematically reveal the relationship between photocatalytic performance and Accepted 7 August 2017 energetic structure. All four chalcogenides exhibited interesting photocatalytic activities under ultravio- Available online 16 August 2017 let, visible and near-infrared light. However, their photocatalytic performances and stability signiﬁcantly depended on the band gap width, and the valence band and conduct band position, which was determined Keywords: by their composition. Increasing the X atomic number from O to Te resulted in the upward movement Silver chalcogen compounds of the valence band top and the conduct band bottom, which resulted in narrower band gaps, a wider Electronic structure absorption spectrum, a weaker photo-oxidization capacity, a higher recombination probability of hole Photocatalytic performance and electron pairs, lower quantum efﬁciency, and worse stability. Among them, Ag O has the highest Band gap 2 Free radical photocatalytic performance and stability due to its widest band gap and lowest position
Applied Surface Science – Elsevier
Published: Jan 1, 2018
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