Perovskite photocatalyst CsPbBr3-xIx with a bandgap funnel structure for H2 evolution under visible light

被引：144

作者：

Guan, Zihan ^{[1
]}

Wu, Yaqiang ^{[1
]}

Wang, Peng ^{[1
]}

Zhang, Qianqian ^{[1
]}

Wang, Zeyan ^{[1
]}

Zheng, Zhaoke ^{[1
]}

Liu, Yuanyuan ^{[1
]}

Dai, Ying ^{[2
]}

Whangbo, Myung-Hwan ^{[3
]}

Huang, Baibiao ^{[1
]}

机构：

[1] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China

[2] Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China

[3] North Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2019年 / 245卷

基金：

中国国家自然科学基金;

关键词：

All-inorganic perovskite; Photocatalysis; Halide gradient; Bandgap funnel; Hydrogen evolution; ANION-EXCHANGE; CO2; REDUCTION; SOLAR-CELLS; NANOCRYSTALS; CSPBX3; BR; CL; EFFICIENCY;

D O I：

10.1016/j.apcatb.2019.01.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A simple and efficient light-assisted method is employed to prepare powder samples of all-inorganic mixedperovskite CsPbBr3-xIx from CsPbBr3-xIx by ion exchange in aqueous HBr/KI solution such that the concentration of I in a sample particle decreases on going from the surface to the interior. CsPbBr3-xIx/Pt, namely, CsPbBr3-xIx samples loaded with Pt nanoparticles, shows a high performance for the hydrogen evolution under visible-light irradiation in aqueous HBr solution saturated with CsPbBr3. The H-2 evolution rate of the CsPbBr3-xIx/Pt powders (200 mg) is determined to be 224 mu mol h(-1), under 120 mW cm(-2) visible-light (lambda >= 420 nm) illumination. The CsPbBr3-xIx. samples have a high stability, with no apparent decrease in the catalytic activity after 50 h of repeated H-2 evolution experiments. The apparent quantum efficiency of CsPbBr3-xIx /Pt is determined to be 2.15% under the irradiation of 450 nm light.

引用

页码：522 / 527

页数：6

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