Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 30, Pages 14633-14643Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta03858a
Keywords
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Funding
- Basic Science Research Program through the National Research Foundation of Korea [2017R1A2B3009135]
- Future Material Discovery Program through the National Research Foundation of Korea [2016M3D1A1027666]
- Nano Material Technology Development Program through the National Research Foundation of Korea [2016M3A7B4910]
- International Energy Joint R&D Program of the Korea Institute of Energy Technology Evaluation and Planning [20168510011350]
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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 similar to 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.
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