Journal
CURRENT APPLIED PHYSICS
Volume 17, Issue 5, Pages 679-683Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2017.02.015
Keywords
Ferroelectric; BiFeO3; Heterostructure; Nanostructure; Photoelectrochemical properties
Funding
- Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea government Ministry of Trade, industry Energy [20164030201340]
- National Research Foundation of Korea grants - Korea government (MSIP) [2014R1A1A1006405]
- National Research Foundation of Korea [2014R1A1A1006405] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Ferroelectric based heterostructures have shown great promises in solar water splitting due to unique photoelectrochemical (PEC) properties including polarization-induced charge separation and tunable electrochemical surface reaction. A highly ordered ferroelectric BiFeO3/TiO2 nanotube (TNT) heterostructures were fabricated by anodic oxidation and pulsed laser deposition. The microscopic morphology, optical, and PEC properties of nanostructures were characterized. The BiFeO3/TNT photoelectrode is photoactive under visible light illumination, which exhibits higher photocurrent from greater water oxidation, compared with the pure TNT photoelectrode. The coating thickness of BiFeO3 strongly affected the photoelectrochemical properties. The enhanced PEC performance could be attributed to the effective charge separation and the favorable band bending for water oxidation, originating from ferroelectric polarization-related internal field. (C) 2017 Elsevier B.V. All rights reserved.
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