Physical and photoelectrochemical characterization of Ti-doped hematite photoanodes prepared by solution growth

被引：85

作者：

Shen, Shaohua ^{[1
,2
]}

Kronawitter, Coleman X. ^{[2
]}

Wheeler, Damon A. ^{[3
]}

Guo, Penghui ^{[1
]}

Lindley, Sarah A. ^{[3
]}

Jiang, Jiangang ^{[1
]}

Zhang, Jin Z. ^{[3
]}

Guo, Liejin ^{[1
]}

Mao, Samuel S. ^{[2
]}

机构：

[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Int Res Ctr Renewable Energy, Xian 710049, Shaanxi, Peoples R China

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Dept Mech Engn, Environm Energy Technol Div, Berkeley, CA 94720 USA

[3] Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2013年 / 1卷 / 46期

基金：

中国国家自然科学基金;

关键词：

IRON-OXIDE FILMS; NANOROD ARRAYS; WATER OXIDATION; THIN-FILMS; ALPHA-FE2O3; PHOTOELECTRODES; HYDROGEN-PRODUCTION; OXYGEN-PRESSURE; VISIBLE-LIGHT; FEATURE SIZE; PERFORMANCE;

D O I：

10.1039/c3ta13453a

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：

We present the fabrication and characterization of Ti-doped hematite (alpha-Fe2O3) films for application as photoanodes in photoelectrochemical (PEC) cells for water splitting. It is demonstrated that Ti doping significantly improves the PEC activity as the photocurrent at 1.0 V vs. Ag/AgCl electrode for a 400 nm thick Ti-doped film (0.66 mA cm(-2)) was found to be similar to 14 times higher than that of an undoped film (0.045 mA cm(-2)). The films were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultrafast transient absorption spectroscopy to obtain information about their structural, electronic, and charge carrier dynamic properties. Based on characterization of the chemical states of the involved elements as well as the charge carrier dynamics of the films with Ti doping, it appears that the photocurrent enhancement is related to an increase in charge carrier density or reduced electron-hole recombination. The highest incident photon conversion efficiency (IPCE) measured for this system was 27.0% at 360 nm at a potential of 1.23 V vs. reversible hydrogen electrode (RHE), which was obtained on a 400 nm thick Ti-doped alpha-Fe2O3 film.

引用

页码：14498 / 14506

页数：9

共 70 条

[1] Metal oxide photoanodes for solar hydrogen production [J].

Alexander, Bruce D. ;

Kulesza, Pawel J. ;

Rutkowska, Iwona ;

Solarska, Renata ;

Augustynski, Jan .

JOURNAL OF MATERIALS CHEMISTRY, 2008, 18 (20) :2298-2303

[2]

[Anonymous], 1995, Handbook of X-ray Photoelectron Spectroscopy. A Reference Book of Standard Spectra for Identification and Interpretation of XPS Data

[3] Investigation of ceramic Fe2O3⟨Ta⟩ photoelectrodes for solar energy photoelectrochemical converters [J].

Aroutiounian, VM ;

Arakelyan, VM ;

Shahnazaryan, GE ;

Stepanyan, GM ;

Turner, JA ;

Khaselev, O .

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 2002, 27 (01) :33-38

[4]

AUGUSTYNSKI J, 2006, P SPIE, V6340

[5]

Bersani D, 1999, J RAMAN SPECTROSC, V30, P355, DOI 10.1002/(SICI)1097-4555(199905)30:5<355::AID-JRS398>3.0.CO

[6]

2-C

[7] Effect of Tin Doping on α-Fe2O3 Photoanodes for Water Splitting [J].

Bohn, Christopher D. ;

Agrawal, Amit K. ;

Walter, Erich C. ;

Vaudin, Mark D. ;

Herzing, Andrew A. ;

Haney, Paul M. ;

Talin, A. Alec ;

Szalai, Veronika A. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (29) :15290-15296

[8] "In rust we trust". Hematite - the prospective inorganic backbone for artificial photosynthesis [J].

Bora, Debajeet K. ;

Braun, Artur ;

Constable, Edwin C. .

ENERGY & ENVIRONMENTAL SCIENCE, 2013, 6 (02) :407-425

[9] SMALL-POLARON VERSUS BAND CONDUCTION IN SOME TRANSITION-METAL OXIDES [J].

BOSMAN, AJ ;

VANDAAL, HJ .

ADVANCES IN PHYSICS, 1970, 19 (77) :1-&

[10] Decoupling Feature Size and Functionality in Solution-Processed, Porous Hematite Electrodes for Solar Water Splitting [J].

Brillet, Jeremie ;

Gratzel, Michael ;

Sivula, Kevin .

NANO LETTERS, 2010, 10 (10) :4155-4160

← 1 2 3 4 5 6 7 →