Abnormal cathodic photocurrent generated on an n-type FeOOH nanorod-array photoelectrode

Chen, Hongjun, Lyu, Miaoqiang, Liu, Gang and Wang, Lianzhou (2016) Abnormal cathodic photocurrent generated on an n-type FeOOH nanorod-array photoelectrode. Chemistry - A European Journal, 22 14: 4802-4808. doi:10.1002/chem.201504512

Author Chen, Hongjun
Lyu, Miaoqiang
Liu, Gang
Wang, Lianzhou
Title Abnormal cathodic photocurrent generated on an n-type FeOOH nanorod-array photoelectrode
Journal name Chemistry - A European Journal   Check publisher's open access policy
ISSN 1521-3765
Publication date 2016-02-16
Year available 2016
Sub-type Article (original research)
DOI 10.1002/chem.201504512
Open Access Status Not Open Access
Volume 22
Issue 14
Start page 4802
End page 4808
Total pages 7
Place of publication Weinheim, Germany
Publisher Wiley-VCH Verlag
Collection year 2017
Language eng
Formatted abstract
A simple, wet-chemical method for the synthesis of an FeOOH nanorod-array photoelectrode on fluorine-doped tin oxide (FTO) glass is reported. Nanorods of diameter about 35 nm and length about 300 nm have been vertically grown on an FTO substrate. Upon calcination, the FeOOH phase could be easily converted to a hematite structure while maintaining the shape of the nanorod array. An interesting abnormal cathodic photocurrent is generated on the FeOOH nanorod-array photoelectrode under illumination, which is totally different from that obtained on a calcined hematite photoelectrode under the same experimental conditions. The cathodic photocurrent density generated on the FeOOH photoelectrode can also be tuned by applying an electrochemical anodic or cathodic treatment. Detailed analysis has revealed that higher valence state FeIV species in the FeOOH photoelectrode play an important role in sacrificing the photoexcited electrons for generation of the cathodic photocurrent. Comparison between the FeOOH and hematite photoelectrodes allows for a better understanding of the interplay between crystal structure, surface reactions, and photocurrent. The findings on this new abnormal phenomenon could also provide guidance for the design of new types of semiconducting photoelectrochemical devices.
Keyword Iron oxides
Nanorod arrays
Water splitting
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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