标题:Surface energy-driven solution epitaxial growth of anatase TiO2 homostructures for overall water splitting
作者:Li S.; Ruan L.; Wang S.; Wang Z.; Ren Z.; Han G.
作者机构:[Li, S] State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Cyrus Tang Center for Sensor Materials and Application 更多
通讯作者:Ren, Z(renzh@zju.edu.cn)
通讯作者地址:[Ren, Z] State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Cyrus Tang Center for Sensor Materials and Applicatio 更多
来源:Journal of Materials Science and Technology
出版年:2020
卷:46
页码:139-144
DOI:10.1016/j.jmst.2020.01.038
关键词:Anatase TiO2; Homostructure; Overall water splitting; {001}; {101}
摘要:Titanium dioxide (TiO2) has been extensively investigated as a photocatalyst for water splitting to produce H2. However, an overall water splitting by using anatase TiO2 is extremely difficult due to the short lifetime of holes. In this work, we propose that a surface energy decrease from {001} to {101} of anatase TiO2 is able to drive an epitaxial growth. A novel anatase TiO2 homostructure has been successfully synthesized via a facile hydrothermal route, where {101} semi-pyramid nanoparticles epitaxially grew on the both sides of the {001} nanosheets. The epitaxial relationship between the nanoparticles and the nanosheets has been characterized to be {001}//{001} of anatase TiO2. For the first time, it is interesting to find that the homostructure with 12 wt% of {101} semi-pyramid can significantly improve the H2 evolution rate by nearly 5 times compared to the pure nanosheets under the ultraviolet irradiation. More importantly, such homostructure enables 10.78 μmol g−1 h−1 of O2 production whereas the pure nanosheets cannot evolve detectable O2 gas. Meanwhile, the time-resolved photoluminescence analysis indicates that the mean lifetime of the holes is increased from 2.20 ns of the nanosheets to 3.59 ns of the homostructure, accounting for the observed overall water splitting. The findings suggest that constructing a homostructure by a surface energy strategy could be promising towards overall water splitting, which may be applicable to other photocatalytic materials. © 2020
收录类别:SCOPUS
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85080025453&doi=10.1016%2fj.jmst.2020.01.038&partnerID=40&md5=ee7babd022f404454fce78c4c28f3c91
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