Near-complete charge separation in tailored BiVO4-based heterostructure photoanodes toward artificial leaf
- Authors
- 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; Jang, Ho Won
- Issue Date
- 15-Sep-2021
- Publisher
- ELSEVIER
- Keywords
- Bismuth vanadate; Heterostructure; Photoanode; Charge separation; Spontaneous solar water oxidation
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, v.293
- Journal Title
- APPLIED CATALYSIS B-ENVIRONMENTAL
- Volume
- 293
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146375
- DOI
- 10.1016/j.apcatb.2021.120217
- ISSN
- 0926-3373
1873-3883
- Abstract
- 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.
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