Issue 28, 2016

A ferroelectric photocatalyst Ag10Si4O13 with visible-light photooxidation properties

Abstract

Ferroelectric p-block semiconductors are regarded as a new family of visible-light photocatalysts because of their dispersive and anisotropic band structures, as well as their intrinsic internal electric field. Silver silicates belong to this family and have band structures and an internal electric field that can be engineered by modulating the stoichiometry of Ag and SiO4. Here, we have developed a new ferroelectric p-block photocatalyst, Ag10Si4O13, by materials design and band engineering, which exhibits excellent photocatalytic activity towards the degradation of organic compounds, which is driven by visible light. Owing to the unique d10 and sp/p configurations in its electronic structure, Ag10Si4O13 possesses an indirect band gap of 1.72 eV with a highly dispersive conductive band and a flat valence band. This electronic structure promotes the generation, separation, and mobility of photo-induced charge carriers under visible-light illumination, which has been verified experimentally and theoretically. The compatible energy level of the conduction band determines its strong photo-oxidative capability. Moreover, the charge transfer process takes advantage of the existence of an internal electric field in Ag10Si4O13, which is attributed to the distorted SiO4 chain structure.

Graphical abstract: A ferroelectric photocatalyst Ag10Si4O13 with visible-light photooxidation properties

Supplementary files

Article information

Article type
Paper
Submitted
29 Apr 2016
Accepted
17 Jun 2016
First published
17 Jun 2016

J. Mater. Chem. A, 2016,4, 10992-10999

A ferroelectric photocatalyst Ag10Si4O13 with visible-light photooxidation properties

A. Al-keisy, L. Ren, D. Cui, Z. Xu, X. Xu, X. Su, W. Hao, S. X. Dou and Y. Du, J. Mater. Chem. A, 2016, 4, 10992 DOI: 10.1039/C6TA03578G

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