Stable hematite nanosheet photoanodes for enhanced photoelectrochemical water splitting

Peerakiatkhajohn, Piangjai, Yun, Jung-Ho, Chen, Hongjun, Lyu, Miaoqiang, Butburee, Teera and Wang, Lianzhou (2016) Stable hematite nanosheet photoanodes for enhanced photoelectrochemical water splitting. Advanced Materials, 28 30: 6405-6410. doi:10.1002/adma.201601525

Author Peerakiatkhajohn, Piangjai
Yun, Jung-Ho
Chen, Hongjun
Lyu, Miaoqiang
Butburee, Teera
Wang, Lianzhou
Title Stable hematite nanosheet photoanodes for enhanced photoelectrochemical water splitting
Journal name Advanced Materials   Check publisher's open access policy
ISSN 1521-4095
Publication date 2016-05-11
Year available 2016
Sub-type Article (original research)
DOI 10.1002/adma.201601525
Open Access Status Not Open Access
Volume 28
Issue 30
Start page 6405
End page 6410
Total pages 6
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Language eng
Subject 2500 Materials Science
2211 Mechanics of Materials
2210 Mechanical Engineering
Abstract A new type of hematite nanosheets modified with low-cost Ag and Co-Pi nanoparticles (NPs) as photoanodes were reported. Systematic studies on the role of plasmonic Ag NPs and oxygen evolving Co-Pi cocatalyst were conducted to better understand the underlying mechanism of the extraordinary PEC performance. The hematite films were prepared by a simple anodization method. The Fe foils were anodized in an ethylene glycol electrolyte containing 0.3 wt% ammonium fluoride and 2 vol% deionized water. Anodization was carried out in a two-electrode electrochemical cell with a platinum wire cathode at a constant potential in the range of 50 V for 15 min. Then, the yellowish color thin film was obviously grown on Fe foil substrate. Afterward, the as-anodized samples were rinsed with distilled water to remove the excess ions to obtain the FeO films, which were subsequently used for Ag NPs deposition. The as-prepared Ag/FeO films on Fe foil were subsequently annealed in nitrogen and 5% of hydrogen flow gas at 450 °C for 2 h. The study demonstrated that a remarkable photo current density of 4.68 mA cm was achieved by simply modifying the hematite photoanode with low-cost plasmonic AgNPs and Co-Pi cocatalyst, corresponding to a STH efficiency of =0.55%.
Formatted abstract
A vertically grown hematite nanosheet film modified with Ag nanoparticles (NPs) and Co-Pi cocatalyst exhibits a remarkably high photocurrent density of 4.68 mA cm−2 at 1.23 V versus RHE. The Ag NPs leads to significantly improved light harvesting and better charge transfer, while the Co-Pi facilitates highly stable oxygen evolution process. This photoelectrode design provides more efficient photoelectrochemical systems for solar energy conversion.
Keyword Hematites
Photoelectrochemical water splitting
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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Australian Institute for Bioengineering and Nanotechnology Publications
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