Charge separation in a nanostep structured perovskite-type photocatalyst induced by successive surface heterojunctions

被引：40
作者：
Cai, Xiaoyan [1 ,2 ]
Mao, Liang [1 ]
Zhang, Junying [1 ]
Zhu, Mingshan [2 ]
Fujitsuka, Mamoru [2 ]
Majima, Tetsuro [2 ]
机构：
[1] Beihang Univ, Dept Phys, Key Lab Micronano Measurement Manipulat & Phys, Minist Educ, Beijing 100191, Peoples R China
[2] Osaka Univ, Inst Sci & Ind Res SANKEN, Mihogaoka 8-1, Ibaraki, Osaka 5670047, Japan
来源：
JOURNAL OF MATERIALS CHEMISTRY A | 2017年 / 5卷 / 21期
基金：
中国国家自然科学基金;
关键词：
NITROGEN-DOPED LA2TI2O7; PLASMONIC PHOTOCATALYSTS; TIO2; PARTICLES; ANATASE TIO2; 101; FACETS; SPECTROSCOPY; EFFICIENCY; SUPERSTRUCTURES; NANOCRYSTALS; COCATALYST;
D O I：
10.1039/c7ta02379k
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：
Formation of surface heterojunctions in photocatalysts through tailoring the exposed crystal facets is an efficient strategy to boost charge separation. In this work, successive surface heterojunctions with large space-charge separation were achieved in a nanostep structured La2Ti2O7 (LTO NSP) single crystal exposed periodically with (010) and (012) facets. The three-dimensional (3D) nanosteps were found to enhance the photocatalytic hydrogen generation performance 35 and 74 times, compared with LTO nanosheets and nanoparticles with the same surface area, respectively. The ultrahigh superficial charge accumulation in LTO NSP verified by surface photovoltage (SPV) measurements suggested the efficient migration of photogenerated charge carriers to the surface. Femtosecond time-resolved diffuse reflectance (TDR) spectroscopy provided direct evidence that the electrons generated from the excited sites of LTO NSP were effectively delivered to the high energy (012) facets and temporarily stored there for further reduction reactions, originating from the successive (010) and (012) surface heterojunctions.
引用
收藏
页码：10442 / 10449
页数：8
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