1. Near-complete charge separation in tailored BiVO4-based heterostructure photoanodes toward artificial leaf.
- Author
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Yang, Jin Wook, Park, Ik Jae, Lee, Sol A., Lee, Mi Gyoung, Lee, Tae Hyung, Park, Hoonkee, Kim, Changyeon, Park, Jaemin, Moon, Jooho, Kim, Jin Young, and Jang, Ho Won
- Subjects
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OXIDATION of water , *STANDARD hydrogen electrode , *STRUCTURAL engineering , *HYDROGEN production , *SOLAR cells - Abstract
[Display omitted] • The synergistic structure with nanoporous BiVO 4 and SnO 2 nanorods boosting the photoelectrochemical properties. • Near-complete charge separation efficiency of 97% and charge carrier dynamics of BiVO 4 /SnO 2. • Spontaneous water oxidation with STH conversion efficiency of 7.3% implemented by the PEC-PV tandem cell. 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 BiVO 4 hampers photoelectrochemical performances under front-side illumination, which is a hindrance to the tandem system. Herein, we design a new photoanode comprising nanoporous BiVO 4 and SnO 2 nanorods focused on the charge separation via structural and interfacial engineering. BiVO 4 /SnO 2 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/BiVO 4 /SnO 2 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. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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