兴奋剂
材料科学
三氧化钨
分解水
光电流
X射线光电子能谱
带隙
密度泛函理论
氧化锡
载流子
分析化学(期刊)
化学工程
光电子学
钨
化学
光催化
计算化学
工程类
催化作用
冶金
生物化学
色谱法
作者
Teng Zhang,Zonglong Zhu,Haining Chen,Bai Yang,Shuang Xiao,Xiaoli Zheng,Qingzhong Xue,Shihe Yang
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2015-01-01
卷期号:7 (7): 2933-2940
被引量:167
摘要
In this paper, we have studied Fe-doping of nanostructured tungsten trioxide (WO3) and its pronounced effect in promoting the photoelectrochemical (PEC) water splitting performance. Vertically aligned Fe-doped WO3 nanoflakes on fluorine-doped tin oxide (FTO) were synthesized via the hydrothermal method. An X-ray photoelectron spectroscopy (XPS) analysis confirmed the Fe3+ substitution at the W6+ site in the prepared films. Broadened visible light absorption was observed in doped films, likely due to the formation of extra band states through doping. The Fe-doping was shown to greatly improve the PEC water splitting performance of WO3. More specifically, the 2 mol% Fe-doped WO3 achieved a photocurrent density of 0.88 mA cm−2 at 1.23 V versus RHE, approximately 30% higher than that of the undoped WO3 (0.69 mA cm−2 at 1.23 V versus RHE). This enhancement was attributed to the reduced band gap and the doping-enhanced charge carrier density as confirmed by the absorption spectra and the Mott–Schottky plots, respectively. Finally, first-principles density functional theory (DFT) calculations confirmed that the formation of oxygen vacancies was favored after Fe-doping, contributing to the increased charge carrier density in slightly doped films.
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