Novel Composites of -Fe2O3 Tetrakaidecahedron and Graphene Oxide as an Effective Photoelectrode with Enhanced Photocurrent Performances

详细信息    查看全文

• 作者：Shaoxiong Liu ; Lingxia Zheng ; Pingping Yu ; Sancan Han and Xiaosheng Fang
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：May 17, 2016
• 年：2016
• 卷：26
• 期：19
• 页码：3331-3339
• 全文大小：1892K
• ISSN：1616-3028

文摘

Novel composites composed of α-Fe₂O₃ tetrakaidecahedrons and graphene oxide have been easily fabricated and demonstrated to be efficient photoelectrodes for photoelectrochemical water splitting reaction with superior photocurrent response. α-Fe₂O₃ tetrakaidecahedrons are facilely synthesized in a green manner without any organic additives and then modified with graphene oxide. The morphological and structural properties of α-Fe₂O₃/graphene composite are intensively investigated by several means, such as X-ray diffraction, field-emission scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, Fourier Transform infrared spectroscopy, and Raman spectroscopy. The tetrakaidecahedronal hematite particles have been indicated to be successfully coupled with graphene oxide. Systematical photoelectrochemical and impedance spectroscopy measurements have been carried out to investigate the favorable performance of α-Fe₂O₃/graphene composites, which are found to be effective photoanodes with rapid, steady, and reproducible feature. The coupling of graphene with α-Fe₂O₃ particles has greatly enhanced the photoelectrochemical performance, resulting in higher photocurrent and lower onset potential than that of pure α-Fe₂O₃. This investigation has provided a feasible method to synthesize α-Fe₂O₃ tetrakaidecahedron and fabricate an efficient α-Fe₂O₃/graphene photoelectrode for photoelectrochemical water oxidation, suggesting a promising route to design noble metal free semiconductor/graphene photocatalysts.