Ta3N5 Nanotube Arrays for Visible Light Water Photoelectrolysis

被引：162
作者：
Feng, Xinjian [1 ]
LaTempa, Thomas J. [2 ]
Basham, James I. [2 ]
Mor, Gopal K. [1 ]
Varghese, Oomman K. [1 ]
Grimes, Craig A. [1 ,2 ]
机构：
[1] Penn State Univ, Inst Mat Res, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA
来源：
NANO LETTERS | 2010年 / 10卷 / 03期
关键词：
Hydrogen; water photoelectrolysis; tantalum nitride; tantalum; photolysis; TIO2; NANOTUBE; SOLAR-ENERGY; TAON; PHOTOCATALYST; EFFICIENCY; CELLS; OXIDE; IRRADIATION; FABRICATION; PHOTOLYSIS;
D O I：
10.1021/nl903886e
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Tantalum nitride (Ta3N5) has a band gap of approximately 2.07 eV, suitable for collecting more than 45% of the incident solar spectrum energy. We describe a simple method for scale fabrication of highly oriented Ta3N5 nanotube array films, by anodization of tantalum foil to achieve vertically oriented tantalum oxide nanotube arrays followed by a 700 degrees C ammonia anneal for sample crystallization and nitridation. The thin walled amorphous nanotube array structure enables transformation from tantalum oxide to Ta3N5 to occur at relatively low temperatures, while high-temperature annealing related structural aggregation that commonly occurs in panicle Films is avoided, In I M KOH solution, under AM 1.5 illumination with 0.5 V dc bias typical sample (nanotube length approximate to 240 rim, wail thickness approximate to 7 nm) visible light incident photon conversion efficiencies (IPCE) as high as 5 3% were obtained. The enhanced visible light activity in combination with the ordered one-dimensional nanoarchitecture makes Ta3N5 nanotube arrays films a promising candidate for visible light water photoelectrolysis.
引用
收藏
页码：948 / 952
页数：5
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