As an artificial leaf, a tandem device for zero-bias solar water splitting is a capable solution for practical hydrogen production. Despite a promise, poor charge transport of BiVO4 hampers photoelectrochemical performances under front-side illumination, which is a hindrance to the tandem system. Herein, we design a new photoanode comprising nanoporous BiVO4 and SnO2 nanorods focused on the charge separation via structural and interfacial engineering. BiVO4/SnO2 photoanode exhibits not only remarkable charge separation efficiency of 97% but also, by loading NiFe as a co-catalyst for water oxidation, high photocurrent density of 5.61 mA cm−2 at 1.23 V versus the reversible hydrogen electrode under front-side 1 sun illumination. Consequently, a tandem cell comprising NiFe/BiVO4/SnO2 photoanode and perovskite/Si tandem solar cell generates an operating photocurrent density of 5.90 mA cm−2 with a solar-to-hydrogen conversion efficiency of 7.3% in zero-bias. This work would be a significant step to develop spontaneous solar hydrogen production.
Bibliographical noteFunding Information:
This work was supported by KOREA HYDRO & NUCLEAR POWER CO., LTD. (No. 2018-Tech-21 ) and the National Research Foundation of Korea (NRF) grant funded by the Korea government Ministry of Science and ICT (MSIT) ( 2019M3E6A1103818 , 2021R1A2B5B03001851 , 2021R1C1C2006142 ). The Inter-University Semiconductor Research Center and Institute of Engineering Research at Seoul National University provided research facilities for this work.
© 2021 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Process Chemistry and Technology