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：Du, Y[1];Hao, WC[2];Hao, WC[3];Hao, WC[4];Du, Y[4]

机构：[1]Univ Wollongong, AIIM, ISEM, Wollongong, NSW 2525, Australia;[2]Beihang Univ, Dept Phys, Beijing 100191, Peoples R China;[3]Beihang Univ, Minist Educ MOE, Key Lab Micronano Measurement Manipulat & Phys, Beijing 100191, Peoples R China;[4]Guizhou Inst Technol, Sch Mat & Met, Guizhou 550007, Peoples R China;[5]Univ Wollongong, UOW BUAA Joint Res Ctr, Wollongong, NSW 2525, Australia

第一机构：Univ Wollongong, AIIM, ISEM, Wollongong, NSW 2525, Australia

通信机构：corresponding author), Univ Wollongong, AIIM, ISEM, Wollongong, NSW 2525, Australia;corresponding author), Beihang Univ, Dept Phys, Beijing 100191, Peoples R China;corresponding author), Beihang Univ, Minist Educ MOE, Key Lab Micronano Measurement Manipulat & Phys, Beijing 100191, Peoples R China;corresponding author), Univ Wollongong, UOW BUAA Joint Res Ctr, Wollongong, NSW 2525, Australia.

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：;WOS:【SCI-EXPANDED(收录号:WOS:000379473100031)】；

基金：This work is supported by the Australian Research Council (ARC) through a Discovery Project (DP 140102581), the National Natural Science Foundation of China (Grant No. 51072012, No. 51272015), the Fundamental Research Funds for the Central Universities (Grand No. YWF-16-JCTD-B-03), and the Beijing Key Discipline Foundation of Condensed Matter Physics. The authors acknowledge the service supported by the Electron Microscopy Centre at the University of Wollongong. The authors thank Dr T. Silver for her valuable comments on this work.

语种：英文

外文关键词：Carrier mobility - Charge transfer - Electric fields - Electronic structure - Energy gap - Ferroelectric materials - Ferroelectricity - Light - Photocatalytic activity - Photooxidation - Silicates - Silicon

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 d(10) 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.