Facet-Controlling Agents Free Synthesis of Hematite Crystals with High-Index Planes: Excellent Photodegradation Performance and Mechanism Insight

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• 作者：Dahu Ding ; Yang Huang ; Cuifeng Zhou ; Zongwen Liu ; Jichang Ren ; Ruiqin Zhang ; Jianhai Wang ; Yuanjian Zhang ; Zhongfang Lei ; Zhenya Zhang ; Chunyi Zhi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：January 13, 2016
• 年：2016
• 卷：8
• 期：1
• 页码：142-151
• 全文大小：666K
• ISSN：1944-8252

文摘

Hematite (α-Fe₂O₃) crystals with uniform size and structure are synthesized through very facile one-pot hydrothermal methods without any additive. The as-synthesized sub-micrometer-sized α-Fe₂O₃ crystals with small surface areas perform superb visible light photodegradation activities, even much better than most other α-Fe₂O₃ nanostructures with large surface areas. Profound mechanism analyses reveal that the microwave-assisted hydrothermal (Mic-H) synthesized α-Fe₂O₃ is enclosed by 12 high-index {2-15} facets. The structure and the low unoccupied molecular orbital (LUMO) of the high-index planes result in the excellent photocatalytic activity. This is the first report on the formation of {2-15} plane group of hematite, and the synthesis of the hematite particles with the {2-15} planes is very simple and no any facet-controlling agent is used. This study may pave the way to further performance enhancement and practical applications of the cheap hematite materials.