Enhanced photoelectrochemical water splitting on novel nanoflake WO3 electrodes by dealloying of amorphous Fe-W alloys

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	Enhanced photoelectrochemical water splitting on novel nanoflake WO3 electrodes by dealloying of amorphous Fe-W alloys
	Zhang, J ; Ling, YH ; Gao, WB ; Wang, S ; Li, JT
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2013
卷号	1 期号:36 页码:10677
ISSN号	2050-7488
通讯作者	Ling, YH (reprint author), Tsinghua Univ, Sch Mat Sci & Engn, Lab Adv Mat, Beijing 100084, Peoples R China.
中文摘要	Photocorrosion-resistant tungsten trioxide (WO3) nanoflake arrays were synthesized via a new route which involves the dealloying of an electrodeposited Fe-W amorphous alloy and subsequent thermal treatment in air. Cyclic voltammetry measurements were employed to evaluate the surface capacitive characteristics. The interfacial capacitance measurements showed that the specific surface capacitance of the nanoflake WO3 electrode (5900 mu F cm(-2)) is almost twice as large as that of the thermally oxidized plain WO3 electrode (2930 mu F cm(-2)), displaying a dramatic increase in surface area. UV-Vis absorption spectroscopy revealed that the bandgap of the oxide film increased from 2.2 to 2.75 eV by gradually eliminating iron from the Fe-W compounds. The photoelectrochemical (PEC) measurements of the nanoflake WO3 electrode exhibited a significant enhancement of the photocurrent of 2.25 mA cm(-2) (about 2.5-fold higher than that of thermally oxidized plain WO3) at a bias potential of 1.5 V (vs. SCE) under light illumination of 100 mW cm(-2). Mott-Schottky relation analysis demonstrated that the carrier concentration increased by an order of magnitude (3.19 x 10(19) vs. 1.28 x 10(18) cm(-3)), implying that the enhanced PEC water splitting performance should be attributed to the unique nanoflake architecture, which offers improved light harvesting as well as efficient charge transportation.
资助信息	National Nature Science Foundation of China [91023037]; National Magnetic Confinement Fusion Science Program [2010GB106003]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/56969]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhang, J,Ling, YH,Gao, WB,et al. Enhanced photoelectrochemical water splitting on novel nanoflake WO3 electrodes by dealloying of amorphous Fe-W alloys[J]. JOURNAL OF MATERIALS CHEMISTRY A,2013,1(36):10677.
APA	Zhang, J,Ling, YH,Gao, WB,Wang, S,&Li, JT.(2013).Enhanced photoelectrochemical water splitting on novel nanoflake WO3 electrodes by dealloying of amorphous Fe-W alloys.JOURNAL OF MATERIALS CHEMISTRY A,1(36),10677.
MLA	Zhang, J,et al."Enhanced photoelectrochemical water splitting on novel nanoflake WO3 electrodes by dealloying of amorphous Fe-W alloys".JOURNAL OF MATERIALS CHEMISTRY A 1.36(2013):10677.