Reactive Ballistic Deposition of α-Fe2O3 Thin Films for Photoelectrochemical Water Oxidation

被引：167

作者：

Hahn, Nathan T. ^{[1
]}

Ye, Heechang ^{[2
]}

Flaherty, David W. ^{[1
]}

Bard, Allen J. ^{[2
]}

Mullins, C. Buddie ^{[1
,2
]}

机构：

[1] Univ Texas Austin, Dept Chem Engn, Texas Mat Inst, Ctr Nano & Mol Sci, Austin, TX 78712 USA

[2] Univ Texas Austin, Ctr Electrochem, Dept Chem & Biochem, Austin, TX 78712 USA

来源：

ACS NANO | 2010年 / 4卷 / 04期

基金：

美国国家科学基金会;

关键词：

hematite; photocatalysis; water splitting; solar; nanostructured; NANOTUBE ARRAYS; NANOSTRUCTURED ALPHA-FE2O3; SEMICONDUCTOR ELECTRODES; HYDROGEN-PRODUCTION; TITANIUM CARBIDE; REFRACTIVE-INDEX; TIO2; NANOTUBE; IRON-OXIDE; HEMATITE; PHOTOOXIDATION;

D O I：

10.1021/nn100032y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the preparation of alpha-Fe2O3 electrodes using a technique known as reactive ballistic deposition in which iron metal is evaporatively deposited in an oxygen ambient for photoelectrochemical (PLC) water oxidation. By manipulating synthesis parameters such as deposition angle, film thickness, and annealing temperature, we find that it is possible to optimize the structural and morphological properties of such films in order to improve their PLC efficiency. Incident photon to current conversion efficiencies (IPCE) are used to calculate an AM1.5 photocurrent of 0.55 mA/cm(2) for optimized films with an IPCE reaching 10% at 420 nm in 1 M KOH at +0.5 V versus Ag/AgCl. We also note that the commonly observed low photoactivity of extremely thin hematite films on fluorine-doped tin oxide substrates may be improved by modificatiol of annealing conditions in some cases.

引用

页码：1977 / 1986

页数：10

共 40 条

[1] ARTIFICIAL PHOTOSYNTHESIS - SOLAR SPLITTING OF WATER TO HYDROGEN AND OXYGEN [J].

BARD, AJ ;

FOX, MA .

ACCOUNTS OF CHEMICAL RESEARCH, 1995, 28 (03) :141-145

[2] Influence of Feature Size, Film Thickness, and Silicon Doping on the Performance of Nanostructured Hematite Photoanodes for Solar Water Splitting [J].

Cesar, Ilkay ;

Sivula, Kevin ;

Kay, Andreas ;

Zboril, Radek ;

Graetzel, Michael .

JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (02) :772-782

[3] Structural and chemical characterization of aligned crystalline nanoporous MgO films grown via reactive ballistic deposition [J].

Dohnálek, Z ;

Kimmel, GA ;

McCready, DE ;

Young, JS ;

Dohnálková, A ;

Smith, RS ;

Kay, BD .

JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (14) :3526-3529

[4] Visible light-induced water oxidation on mesoscopic α-Fe2O3 films made by ultrasonic spray pyrolysis [J].

Duret, A ;

Grätzel, M .

JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (36) :17184-17191

[5] Anisotropic photocatalytic properties of hematite [J].

Eggleston, Carrick M. ;

Shankle, Angela J. A. ;

Moyer, Amanda J. ;

Cesar, Ilkay ;

Graetzel, Michael .

AQUATIC SCIENCES, 2009, 71 (02) :151-159

[6] Reactive ballistic deposition of porous TiO2 films:: Growth and characterization [J].

Flaherty, David W. ;

Dohnalek, Zdenek ;

Dohnalkova, Alice ;

Arey, Bruce W. ;

McCready, David E. ;

Ponnusamy, Nachimuthu ;

Mullins, C. Buddie ;

Kay, Bruce D. .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (12) :4765-4773

[7] Low Temperature Synthesis and Characterization of Nanocrystalline Titanium Carbide with Tunable Porous Architectures [J].

Flaherty, David W. ;

May, R. Alan ;

Berglund, Sean P. ;

Stevenson, Keith J. ;

Mullins, C. Buddie .

CHEMISTRY OF MATERIALS, 2010, 22 (02) :319-329

[8] Growth and Characterization of High Surface Area Titanium Carbide [J].

Flaherty, David W. ;

Hahn, Nathan T. ;

Ferrer, Domingo ;

Engstrom, Todd R. ;

Tanaka, Paul L. ;

Mullins, C. Buddie .

JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (29) :12742-12752

[9] ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE [J].

FUJISHIMA, A ;

HONDA, K .

NATURE, 1972, 238 (5358) :37-+

[10] Enhancement of photoelectrochemical hydrogen production from hematite thin films by the introduction of Ti and Si [J].

Glasscock, Julie A. ;

Barnes, Piers R. F. ;

Plumb, Ian C. ;

Savvides, Nick .

JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (44) :16477-16488

← 1 2 3 4 →