Surface energy-driven solution epitaxial growth of anatase TiO2 homostructures for overall water splitting

• 作者: Gaorong Han Luoyuan Ruan Shanpeng Wang Shi Li Zhaohui Ren Zhiyu Wang
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（11）
• 页码范围: 139-144
• 页数: 6页
• 语种: 英文

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 μmolg-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.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Shi Li		1	0	0.0	0.0
2	Luoyuan Ruan		1	0	0.0	0.0
3	Shanpeng Wang		1	0	0.0	0.0
4	Zhiyu Wang		1	0	0.0	0.0
5	Zhaohui Ren		1	0	0.0	0.0
6	Gaorong Han		1	0	0.0	0.0