光催化
材料科学
纳米技术
半导体
化学工程
铋
氮气
载流子
催化作用
光电子学
分解水
氢
工程类
有机化学
化学
冶金
生物化学
作者
Jun Di,Jiexiang Xia,Matthew F. Chisholm,Jun Zhong,Chao Chen,Xingzhong Cao,Fan Dong,Zhen Chi,Hailong Chen,Yuxiang Weng,Jun Xiong,Shize Yang,Huaming Li,Zheng Liu,Sheng Dai
标识
DOI:10.1002/adma.201807576
摘要
Solar photocatalysis is a potential solution to satisfying energy demand and its resulting environmental impact. However, the low electron-hole separation efficiency in semiconductors has slowed the development of this technology. The effect of defects on electron-hole separation is not always clear. A model atomically thin structure of single-unit-cell Bi3 O4 Br nanosheets with surface defects is proposed to boost photocatalytic efficiency by simultaneously promoting bulk- and surface-charge separation. Defect-rich single-unit-cell Bi3 O4 Br displays 4.9 and 30.9 times enhanced photocatalytic hydrogen evolution and nitrogen fixation activity, respectively, than bulk Bi3 O4 Br. After the preparation of single-unit-cell structure, the bismuth defects are controlled to tune the oxygen defects. Benefiting from the unique single-unit-cell architecture and defects, the local atomic arrangement and electronic structure are tuned so as to greatly increase the charge separation efficiency and subsequently boost photocatalytic activity. This strategy provides an accessible pathway for next-generation photocatalysts.
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