Controllable Synthesis of Bi2Fe4O9 Nanocrystal with High Active Facets and the Enhanced Visible Light Photoelectrochemical Property
1 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266045, China
2 Faculty of Chemical Science and Engineering, Qingdao University, Qingdao, 266071, China
3 Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou, 730000, China
Bi2Fe4O9 nanocrystals with high active facets were controllably synthesized via a chemical co-precipitation process followed by a hydrothermal treatment at various microenvironment. The nanocrystals can be controlled preferentially to grow along (001) and show flat side facets of (110) and (10). The photoinduced charge-transfer property of Bi2Fe4O9 was significantly improved. Such a high photo-to-current conversion efficiency is ascribed to the synergistic effect of energy band structure and the high reactivity of exposed (110) and (10) facets. The high surface energy at the interface of the Bi2Fe4O9 efficiently reduced the recombination of photoinduced electron-hole pairs, and thus increasing the lifetime of charge carriers and enhancing the photo-to-current efficiency of the Bi2Fe4O9.
Key words: Photoelectrochemical / Water splitting / Bismuth Vanadate / Solar Energy / Visible-light
© The Authors, published by EDP Sciences, 2016
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