Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 776, Issue -, Pages 839-849Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.10.263
Keywords
Compositionally graded structure; Photoelectrochemistry; Charge transport; Water oxidation; Self-driven overall cell
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Funding
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [20154030200870]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2018R1A2B2004050]
- National Research Foundation of Korea [2018R1A2B2004050] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To maximize the advantages of thin-film-based TiO2 photoelectrodes for transparent self-driven photoelectrochemical (PEC) reactions, we artificially designed a compositionally graded bi-layer compounds consisting of SnO2 and TiO2. This structure exhibited a vigorous photocatalytic activity, sufficient photovoltage, and long-term stability. A compositionally graded SnO2/TiO2 interface (G-SnTiO) for improved charge transport efficiency and sufficient photovoltage was derived by a solution process using simultaneous sintering after sol-gel coating the SnO2/TiO2 layers; the structure was verified by various analysis methods, such as transmission electron microscopy, energy dispersive X-ray spectroscopy, and secondary ion mass spectrometry. The high performance from the G-SnTiO structure was attributed to an effective charge separation from the formation of a heterostructure interface with reduced defects, resulting in a sufficient photovoltage for self-driving. To construct self-driven and sustainable overall cells without an external potential and considerable reduction in transparency, two-electrode PEC cells with a G-SnTiO photoanode and Cu2O photocathode were fabricated with a regular hexahedron shape for a color degradation test of methylene-blue-incorporated electrolytes, and exhibited enhanced purification speed and robust durability. (C) 2018 Elsevier B.V. All rights reserved.
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