Probing the dynamics of photogenerated holes in doped hematite photoanodes for solar water splitting using transient absorption spectroscopy

被引：20
作者：
Pei, Guang Xian [1 ]
Wijten, Jochem H. J. [1 ]
Weckhuysen, Bert M. [1 ]
机构：
[1] Univ Utrecht, Debye Inst Nanomat Sci, Inorgan Chem & Catalysis, Univ Sweg 99, NL-3584 CG Utrecht, Netherlands
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2018年 / 20卷 / 15期
关键词：
NANOSTRUCTURED ALPHA-FE2O3; HYDROGEN-PRODUCTION; OXIDATION; PHOTOOXIDATION; RECOMBINATION; ELECTRODES; EFFICIENCY; ULTRAFAST;
D O I：
10.1039/c8cp00981c
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：
Hematite (alpha-Fe2O3) has been extensively studied as a promising candidate for photoelectrochemical water splitting; however its overall efficiency is still relatively low. Doping is believed to be efficient in enhancing the photoactivity, while direct evidence for the promoted charge carrier dynamics is very limited. Herein, transient absorption spectroscopy was used to directly investigate the yield and decay dynamics of the photogenerated holes in Sn and/or Ti doped alpha-Fe2O3. Sn or Ti doping was observed to have different origins to the enhanced water oxidation photocurrent: Sn doping retarded the electron-hole recombination, while Ti doping mainly increased the photogenerated charge carrier density. Our results also demonstrated that co-doping may combine both advantages to enhance the overall photoactivity of alpha-Fe2O3.
引用
收藏
页码：9806 / 9811
页数：6
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