Boosting hematite photoelectrochemical water splitting by decoration of TiO2 at the grain boundaries
| Autor: | Fan Feng, Hongqiang Wang, Lichao Jia, Xiaokang Qiao, Can Li, Jie Jian |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Photocurrent
Materials science Nanoporous General Chemical Engineering 02 engineering and technology General Chemistry Electrolyte Hematite 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Chemical engineering visual_art visual_art.visual_art_medium Environmental Chemistry Water splitting Grain boundary 0210 nano-technology Contact area Chemical bath deposition |
| Zdroj: | Chemical Engineering Journal. 368:959-967 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2019.03.005 |
| Popis: | Hematite has been one of the most promising candidates for solar water splitting while addressing its poor bulk charge transfer has been always challenging towards its practical application. We show here an efficient strategy of boosting the charge transfer of hematite photoanode by decorating the grain boundaries in Fe2O3 film with TiO2 based on a simple chemical bath deposition. Such strategy resulted in dramatically improved photocurrent density up to 2.90 mA cm−2 at 1.23 V vs. RHE. The IPCE and APCE of the Fe2O3/TiO2 photoanode demonstrated a significant increase to 68% and 95% at 360 nm, respectively. Further investigations reveal that the enhanced PEC performance can be attributed to the improved charge separation efficiency, increased charge carrier density, as well as the enlarged contact area between electrolyte and photoanode. Moreover, modification of the Fe2O3/TiO2 nanoporous film with FeOOH catalyst could achieve a photocurrent of 3.15 mA cm−2 at 1.23 V vs. RHE. We thus believe that our study of decorating grain boundaries by an inorganic layer provides an alternative to address the charge transfer of hematite based photoelectrodes. |
| Databáze: | OpenAIRE |
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