Substantially enhanced front illumination photocurrent in porous SnO2 nanorods/networked BiVO4 heterojunction photoanodes
| Autor: | Jun Min Suh, Cheon Woo Moon, Mi Gyoung Lee, Sol A Lee, Swetha S. M. Bhat, Changyeon Kim, Ho Won Jang, Seung-Pyo Hong, Seokhoon Choi |
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| Rok vydání: | 2018 |
| Předmět: |
Photocurrent
Materials science Photon Tandem Renewable Energy Sustainability and the Environment business.industry Front (oceanography) Heterojunction 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Reversible hydrogen electrode Optoelectronics General Materials Science Nanorod 0210 nano-technology business Porosity |
| Zdroj: | Journal of Materials Chemistry A. 6:14633-14643 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | BiVO4 is a promising photoanode for photoelectrochemical applications owing to its suitable band edge position for oxygen evolving reactions. High photocurrent under front illumination is very much essential to design tandem structures with a wireless configuration. However, the performance of BiVO4 under front illumination is limited due to poor charge transport properties. Here, we show that network-like BiVO4 coupled with porous SnO2 nanorods (NRs) is a promising model to enhance the front illumination performance. A very high photocurrent density of 5.6 mA cm−2 and 5.5 mA cm−2 has been obtained from the front and back illumination at 1.23 V vs. the reversible hydrogen electrode, respectively. We demonstrate that the appropriate nanostructuring of SnO2 NRs/BiVO4 is the underlying technology to tune the performance under directional illumination. The SnO2 NRs/BiVO4 exhibits a maximum incident photon to current efficiency of ∼80% under front and back illumination. A systematic study reveals that the optimized network like BiVO4 coated on porous SnO2 NRs synergistically boosts both the charge separation and transfer efficiencies of the photoanode resulting in a significantly high photocurrent for illumination on either side. This work provides a direction to achieve enhanced photocurrent during front and back side illumination in order to realize a wireless tandem configuration. |
| Databáze: | OpenAIRE |
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