Engineered Hematite Mesoporous Single Crystals Drive Drastic Enhancement in Solar Water Splitting
| Autor: | Hua Gui Yang, Wen Qi Fang, Shuang Yang, Chong Wu Wang, Huijun Zhao, Porun Liu |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Oxide Bioengineering Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound General Materials Science Photocurrent business.industry Mechanical Engineering General Chemistry Hematite 021001 nanoscience & nanotechnology Condensed Matter Physics Solar fuel 0104 chemical sciences Semiconductor chemistry Chemical engineering visual_art Electrode visual_art.visual_art_medium Water splitting 0210 nano-technology Mesoporous material business |
| Zdroj: | Nano letters. 16(1) |
| ISSN: | 1530-6992 |
| Popis: | Mesoporous single crystals (MSCs) rendering highly accessible surface area and long-range electron conductivity are extremely significant in many fields, including catalyst, solar fuel, and electrical energy storage technologies. Hematite semiconductor, whose performance has been crucially limited by its pristine poor charge separation efficiency in solar water splitting, should benefit from this strategy. Despite successful synthesis of many metal oxide MSCs, the fabrication of hematite MSCs remains to be a great challenge due to its quite slow hydrolysis rate in water. Herein, for the first time, we have developed a synthetic strategy to prepare hematite MSCs and systematically investigated their growth mechanism. The electrode fabricated with these crystals is able to achieve a photocurrent density of 0.61 mA/cm(2) at 1.23 V vs RHE under AM 1.5G simulated sunlight, which is 20 times higher than that of electrodes made of solid single crystals. The enhancement is ascribed to the superior light absorption and enhanced charges separation. Our results demonstrate the advantage of incorporation of nanopores into the large-sized hematite single crystals and provide a valuable insight for the development of high performance photoelectrodes in PEC application. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|