New Insights into the Electron-Collection Efficiency Improvement of CdS-Sensitized TiO2 Nanorod Photoelectrodes by Interfacial Seed Layer Mediation

被引:44
作者
Chen, Yu-Lin [1 ]
Chen, Yu-Hung [2 ]
Chen, Jie-Wen [1 ]
Cao, Fengren [3 ]
Li, Liang [3 ]
Luo, Zheng-Ming [1 ]
Leu, Ing-Chi [1 ]
Pu, Ying-Chih [1 ]
机构
[1] Natl Univ Tainan, Dept Mat Sci, Tainan 70005, Taiwan
[2] Natl Cheng Kung Univ, Dept Med, Coll Med, Tainan 701, Taiwan
[3] Soochow Univ, Sch Phys Sci & Technol, CECMP, Suzhou 215006, Peoples R China
基金
中国国家自然科学基金;
关键词
TiO2; seed mediation; nanorod; photoelectrochemical cell; hydrogen generation; CHARGE-CARRIER DYNAMICS; QUANTUM DOTS; NANOWIRE ARRAYS; THIN-FILMS; SHELL NANOCRYSTALS; EXCITON DYNAMICS; SURFACE-STATES; WATER; RUTILE; NANOSTRUCTURES;
D O I
10.1021/acsami.8b22418
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Titanium dioxide (TiO2) nanorods (NRs) are widely used as photoanodes in photoelectrochemical (PEC) solar fuel production because of their remarkable photo-activity and stability. In addition, TiO2 NR electrode materials can be decorated with active CdS quantum dots (QDs) to Sue light expand the sunlight photon capture. The overall photoelectric conversion efficiency for TiO2 NR or QD-sensitized TiO2 NR electrode materials in PEC is typically dominated by their interfacial electron transfer (ET) properties. To understand the key factors affecting the ET, the anatase TiO2 seed layer was added into the interface between the rutile TiO2 NRs and fluorine-doped tin oxide (FTO) substrate. This seed layer enhanced the photocatalytic performance of both the TiO2 NR and CdS QD-sensitized TiO2 NR photoanodes in PEC. Time-resolved photoluminescence spectroscopy and PEC analyses, including Mott-Schottky, electrochemical impedance spectroscopy, and photovoltage (V-ph) measurements, were used to study the charge-carrier dynamics at the interfaces between the FTO, TiO2, and CdS QD. Analysis of the results showed that band alignment at the anatase/rutile junction between the TiO2 and FTO promoted electron-collection efficiency (e(EC)) at the FTO/TiO2 interface and ET rate constant (k(ET)) at the TiO2/CdS QD interface. Furthermore, 34% enhancement of the efficiency in hydrogen (H-2) generation demonstrated the potential of the TiO2 seed-layer-mediated TiO2/CdS QD NR photoanode in the application of PEC solar fuel production. The current work represents new insights into the mechanism of ET in TiO2 and TiO2/CdS QD NR, which is very useful for the development of photoelectrode materials in solar energy conversions.
引用
收藏
页码:8126 / 8137
页数:12
相关论文
共 67 条
[1]   Photoluminescence study of polycrystalline photovoltaic CdS thin film layers grown by close-spaced sublimation and chemical bath deposition [J].
Abken, Anke E. ;
Halliday, D. P. ;
Durose, Ken .
JOURNAL OF APPLIED PHYSICS, 2009, 105 (06)
[2]   Solar Water Splitting by TiO2/CdS/Co-Pi Nanowire Array Photoanode Enhanced with Co-Pi as Hole Transfer Relay and CdS as Light Absorber [J].
Ai, Guanjie ;
Li, Hongxing ;
Liu, Shaopei ;
Mo, Rong ;
Zhong, Jianxin .
ADVANCED FUNCTIONAL MATERIALS, 2015, 25 (35) :5706-5713
[3]   Facile one-pot controlled synthesis of Sn and C codoped single crystal TiO2 nanowire arrays for highly efficient photoelectrochemical water splitting [J].
Aragaw, Belete Asefa ;
Pan, Chun-Jern ;
Su, Wei-Nien ;
Chen, Hung-Ming ;
Rick, John ;
Hwang, Bing-Joe .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2015, 163 :478-486
[4]   Photosensitization of TiO2 Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures [J].
Baker, David R. ;
Kamat, Prashant V. .
ADVANCED FUNCTIONAL MATERIALS, 2009, 19 (05) :805-811
[5]   Quantum Dot Sensitized Solar Cells. A Tale of Two Semiconductor Nanocrystals: CdSe and CdTe [J].
Bang, Jin Ho ;
Kamat, Prashant V. .
ACS NANO, 2009, 3 (06) :1467-1476
[6]   Modulation of Electron Injection in CdSe-TiO2 System through Medium Alkalinity [J].
Chakrapani, Vidhya ;
Tvrdy, Kevin ;
Kamat, Prashant V. .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2010, 132 (04) :1228-+
[7]   CdS/CdSe co-sensitized brookite H:TiO2 nanostructures: Charge carrier dynamics and photoelectrochemical hydrogen generation [J].
Chang, Yung-Shan ;
Choi, Mingi ;
Baek, Minki ;
Hsieh, Ping-Yen ;
Yong, Kijung ;
Hsu, Yung-Jung .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2018, 225 :379-385
[8]   Enhanced photoelectrochemical water splitting performance of α-Fe2O3 nanostructures modified with Sb2S3 and cobalt phosphate [J].
Chen, Dong ;
Liu, Zhifeng ;
Zhou, Miao ;
Wu, Peidong ;
Wei, Jindong .
JOURNAL OF ALLOYS AND COMPOUNDS, 2018, 742 :918-927
[9]   Au-CdS Core-Shell Nanocrystals with Controllable Shell Thickness and Photoinduced Charge Separation Property [J].
Chen, Wei-Ta ;
Yang, Ting-Ting ;
Hsu, Yung-Jung .
CHEMISTRY OF MATERIALS, 2008, 20 (23) :7204-7206
[10]   Rapid and Controllable Flame Reduction of TiO2 Nanowires for Enhanced Solar Water-Splitting [J].
Cho, In Sun ;
Logar, Manca ;
Lee, Chi Hwan ;
Cai, Lili ;
Prinz, Fritz B. ;
Zheng, Xiaolin .
NANO LETTERS, 2014, 14 (01) :24-31