文献类型：期刊文献

英文题名：A ferroelectric photocatalyst Ag10Si4O13 with visible-light photooxidation properties

作者：Al-Keisy, Amar Ren, Long Cui, Dandan Xu, Zhongfei Xu, Xun Su, Xiangdong Hao, Weichang Dou, Shi Xue Du, Yi

第一作者：Al-Keisy, Amar

通信作者：Hao, Weichang

机构：[1] Institute for Superconducting and Electronic Materials [ISEM], Australian Institute for Innovative Materials [AIIM], University of Wollongong, Wollongong, NSW, 2525, Australia; [2] Department of Physics, Key Laboratory of Micro-nano Measurement, Manipulation and Physics, Ministry of Education [MOE], Beihang University, Beijing, 100191, China; [3] School of Materials and Metallurgy, Guizhou Institute of Technology, Guizhou, 550007, China; [4] UOW-BUAA Joint Research Centre, University of Wollongong, Wollongong, NSW, 2525, Australia

第一机构：Institute for Superconducting and Electronic Materials [ISEM], Australian Institute for Innovative Materials [AIIM], University of Wollongong, Wollongong, NSW, 2525, Australia

通信机构：Department of Physics, Key Laboratory of Micro-nano Measurement, Manipulation and Physics, Ministry of Education (MOE), Beihang University, Beijing, 100191, China

年份：2016

卷号：4

期号：28

起止页码：10992-10999

外文期刊名：Journal of Materials Chemistry A

收录：EI(收录号：20162902622128);Scopus(收录号：2-s2.0-84978374785)

语种：英文

外文关键词：Electronic structure - Ferroelectric materials - Silver compounds - Ferroelectricity - Charge transfer - Photooxidation - Energy gap - Electric fields - Light - Silicates

摘要：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. ? 2016 The Royal Society of Chemistry.