Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 120, Issue 5, Pages 2747-2752Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b10838
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) Elements Strategy Initiative to Form Core Research Center
- MEXT Photon and Quantum Basic Research Coordinated Development Program
- Japan Society for the Promotion of Science Foundation [15H03881]
- Iwatani Naoji Foundation
- JSPS
- Program for the MEXT Leading Graduate Schools Academy for Co-creative Education of Environment and Energy Science (ACEEES)
- Grants-in-Aid for Scientific Research [15H03881, 14J11989] Funding Source: KAKEN
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Epitaxial alpha-Fe2O3 thin films on conducting Ta-doped SnO2 bottom layers are prepared by pulsed-laser deposition in order to elucidate variation of the photoelectrochemical (PEC) properties for the water oxidation reaction on the alpha-Fe2O3 photoanodes with different orientation and thickness. Cyclic voltammetry under illumination shows that current density (photocurrent onset potential) of the m-axis oriented samples is considerably larger (lower) than that of the c-axis oriented ones. Using electrochemical impedance spectroscopy under illumination, we ascribe these behaviors to difference in surface states between c-and m-planes besides anisotropic conductivity along the individual axes. Our study demonstrates the power of utilizing well-defined epitaxial thin films to investigate the anisotropic PEC properties of visible-light-driven photo electrodes.
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