Improving photocatalytic hydrogen production via ultrafine-grained precipitates formed nearby surface defects of NiFe-LDH nanosheets

被引：33

作者：

Gao, Chunlang ^{[1
]}

Li, Yuanli ^{[1
]}

Zhang, Zhenghan ^{[1
]}

Li, Weiming ^{[1
]}

Zhong, Jiaxing ^{[1
]}

Zhang, Hang ^{[1
]}

Zhang, Yihong ^{[1
]}

Deng, Lichun ^{[1
]}

Sun, Zaicheng ^{[2
]}

Chen, Ge ^{[2
]}

Zhang, Hui ^{[3
]}

Wang, Lihua ^{[1
]}

Zhuang, Chunqiang ^{[1
]}

Han, Xiaodong ^{[1
]}

机构：

[1] Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Fac Mat & Mfg, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China

[2] Beijing Univ Technol, Coll Environm & Energy Engn, Dept Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China

[3] Ningxia Univ, State Key Lab High efficiency Utilizat Coal & Gree, Yinchuan 750021, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 446卷

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

In-situ TEM; Typical microstructure; Photocatalytic hydrogen; NiFe nanosheet; TiO; 2; nanosheet; NANOCOMPOSITES; HETEROSTRUCTURE; COCATALYSTS; COMPOSITES; EVOLUTION;

D O I：

10.1016/j.cej.2022.137301

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

New types of photocatalytic systems formed by coupling annealed large-sized NiFe-LDH nanosheets with smallsized TiO2 nanosheets were used to facilitate the rapid separation of photo-generated electrons and holes. The photocatalytic hydrogen production for optimized photocatalytic systems can reach 209 mmol/g, which is 8 times of that for TiO2. To understand the photocatalytic mechanism, in-situ annealing transmission electron microscopy (TEM) investigation of the microstructural evolution of large-sized NiFe-LDH nanosheets identified typical microstructures at different annealing stages. The microstructure of the optimized system contains plentiful ultrafine grains distributed along surface delaminated defects, which can provide abundant active sites for photocatalytic hydrogen evolution. Electrochemical and spectroscopic techniques were further used to determine the Z-scheme mechanism, guiding photo-generated electrons to fast transfer onto large-sized NiFeLDH nanosheets to achieve high efficient carrier separation.

引用

页数：8

共 39 条

[1] Hierarchical composites of TiO2 nanowire arrays on reduced graphene oxide nanosheets with enhanced photocatalytic hydrogen evolution performance [J].