Special Section on Solar Fuels Photocatalysis

Photocatalytic water oxidation with iron oxide hydroxide (rust) nanoparticles

[+] Author Affiliations
Timothy L. Shelton, Bronwyn L. Bensema, Nicholas K. Brune, Christopher Wong, Max Yeh, Frank E. Osterloh

University of California, Davis, Department of Chemistry, One Shields Avenue, Davis, California 95616, United States

J. Photon. Energy. 7(1), 012003 (Aug 16, 2016). doi:10.1117/1.JPE.7.012003
History: Received May 7, 2016; Accepted June 21, 2016
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Abstract.  Hematite has attracted considerable interest as a photoanode material for water oxidation under visible illumination. Here, we explore the limits of photocatalytic water oxidation activity with iron (III) oxide hydroxide nanocrystals and NaIO4 as a sacrificial electron acceptor (E=1.63  V NHE at pH=0.5). The sol was prepared by hydrolysis of FeCl3 in boiling 0.002-M HCl solution and confirmed to mainly consist of ß-FeO(OH) (akaganéite) particles with 5 to 15 nm diameter. From a 0.01 M aqueous NaIO4 solution, the sol evolves between 4.5 and 35.2  μmolO2h1, depending on pH, light intensity (>400  nm, 290 to 700  mWcm2), ß-FeO(OH), and NaIO4 concentration. The activity increases with pH, and depends linearly on light intensity and photocatalyst amount, and it varies with sacrificial electron donor concentration. Under optimized conditions, the apparent quantum efficiency is 0.19% (at 400 nm and 460  mWcm2), and the turnover number is 2.58 based on total ß-FeO(OH). Overall, the efficiency of the ß-FeO(OH)/NaIO4 photocatalytic system is limited by electron hole recombination and by particle aggregation over longer irradiation times (24 h). Lastly, surface photovoltage measurements on ß-FeO(OH) films on fluorine doped tin oxide substrate confirm a 2.15 eV effective band gap for the material.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Timothy L. Shelton ; Bronwyn L. Bensema ; Nicholas K. Brune ; Christopher Wong ; Max Yeh, et al.
"Photocatalytic water oxidation with iron oxide hydroxide (rust) nanoparticles", J. Photon. Energy. 7(1), 012003 (Aug 16, 2016). ; http://dx.doi.org/10.1117/1.JPE.7.012003


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