Codoping titanium dioxide nanowires with tungsten and carbon for enhanced photoelectrochemical performance

被引：267

作者：

Cho, In Sun ^{[1
]}

Lee, Chi Hwan ^{[1
]}

Feng, Yunzhe ^{[2
]}

Logar, Manca ^{[2
]}

Rao, Pratap M. ^{[1
]}

Cai, Lili ^{[1
]}

Kim, Dong Rip ^{[3
]}

Sinclair, Robert ^{[2
]}

Zheng, Xiaolin ^{[1
]}

机构：

[1] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[3] Hanyang Univ, Dept Mech Engn, Seoul 133791, South Korea

来源：

NATURE COMMUNICATIONS | 2013年 / 4卷

基金：

新加坡国家研究基金会;

关键词：

DOPED TIO2; WATER; HYDROGEN; PHOTOCATALYSIS; DEGRADATION; EFFICIENT; NANORODS;

D O I：

10.1038/ncomms2729

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Recent density-functional theory calculations suggest that codoping TiO2 with donor-acceptor pairs is more effective than monodoping for improving photoelectrochemical water-splitting performance because codoping can reduce charge recombination, improve material quality, enhance light absorption and increase solubility limits of dopants. Here we report a novel ex-situ method to codope TiO2 with tungsten and carbon (W, C) by sequentially annealing W-precursor-coated TiO2 nanowires in flame and carbon monoxide gas. The unique advantages of flame annealing are that the high temperature (>1,000 degrees C) and fast heating rate of flame enable rapid diffusion of W into TiO2 without damaging the nanowire morphology and crystallinity. This is the first experimental demonstration that codoped TiO2:(W, C) nanowires outperform monodoped TiO2:W and TiO2:C and double the saturation photocurrent of undoped TiO2 for photoelectrochemical water splitting. Such significant performance enhancement originates from a greatly improved electrical conductivity and activity for oxygen-evolution reaction due to the synergistic effects of codoping.

引用

页数：8

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