The development of new heterostructures with high photoactivity is a breakthrough for the limitation of solar-driven water splitting. Here, we first introduce indium oxide (In2O3) nanorods (NRs) as a novel electron transport layer for bismuth vanadate (BiVO4) with a short charge diffusion length. In2O3 NRs reinforce the electron transport and hole blocking of BiVO4, surpassing the state-of-the-art photoelectrochemical performances of BiVO4-based photoanodes. Also, a tannin–nickel–iron complex (TANF) is used as an oxygen evolution catalyst to speed up the reaction kinetics. The final TANF/BiVO4/In2O3 NR photoanode generates photocurrent densities of 7.1 mA cm−2 in sulfite oxidation and 4.2 mA cm−2 in water oxidation at 1.23 V versus the reversible hydrogen electrode. Furthermore, the “artificial leaf,” which is a tandem cell with a perovskite/silicon solar cell, shows a solar-to-hydrogen conversion efficiency of 6.2% for unbiased solar water splitting. We reveal significant advances in the photoactivity of TANF/BiVO4/In2O3 NRs from the tailored nanostructure and band structure for charge dynamics.
|Publication status||Accepted/In press - 2023|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea Government Ministry of Science and ICT (MSIT) (2021M3H4A1A03057403, 2021R1A2B5B03001851). This research was supported by the KRISS (Korea Research Institute of Standards and Science) MPI Lab. Program. The Inter‐University Semiconductor Research Center and Institute of Engineering Research at Seoul National University provided research facilities for this work. M. G. Lee acknowledges the Basic Science Research Program through the NRF funded by the Ministry of Education (2021R1A6A3A03039988). J. W. Yang acknowledges the Basic Science Research Program through the NRF funded by the Ministry of Education (2021R1A6A3A13046700).
© 2023 Seoul National University. Carbon Energy published by Wenzhou University and John Wiley & Sons Australia, Ltd.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science (miscellaneous)
- Energy (miscellaneous)
- Materials Chemistry