Nanostructured Ta3N5 Films as Visible-Light Active Photoanodes for Water Oxidation

被引：72

作者：

Dang, Hoang X. ^{[1
]}

Hahn, Nathan T. ^{[1
]}

Park, Hyun S. ^{[2
,3
]}

Bard, Allen J. ^{[2
,3
]}

Mullins, C. Buddie ^{[1
,2
,3
]}

机构：

[1] Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA

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

[3] Univ Texas Austin, Ctr Nano & Mol Sci, Austin, TX 78712 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 36期

基金：

美国国家科学基金会;

关键词：

REACTIVE BALLISTIC DEPOSITION; GLANCING ANGLE DEPOSITION; THIN-FILMS; PHOTOELECTROCHEMICAL BEHAVIOR; HYDROGEN EVOLUTION; NANOTUBE ARRAYS; TAON; PHOTOOXIDATION; PHOTOCATALYST; OXYNITRIDE;

D O I：

10.1021/jp307369z

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：

Nanostructured Ta3N5 photoanodes (band gap of similar to 2.0 eV) were synthesized via a two-step process: first, nanocolumnar Ta2O5 films were deposited by evaporation of tantalum metal in a vacuum chamber in a low pressure oxygen ambient followed by heating in an ammonia gas flow to convert Ta2O5 into orthorhombic Ta3N5. Under Xe lamp irradiation (similar to 73 mW/cm(2)), a 100 nm nanoporous Ta3N5 electrode achieved an anodic photocurrent of similar to 1.4 mA/cm(2) at +0.5 V versus Ag/AgCl in 1 M KOH solution. By comparison, a dense film achieved similar to 0.4 mA/cm(2) clearly illustrating the importance of nanostructuring for improving the performance of Ta3N5 photoanodes. However, Ta3N5 films suffered from inherent self-oxidation under light illumination, and application of a cobalt cocatalyst layer was found to improve the stability as well as photocatalytic activity of the Ta3N5 films.

引用

页码：19225 / 19232

页数：8

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