Near-complete charge separation in tailored BiVO4-based heterostructure photoanodes toward artificial leaf

Jin Wook Yang, Ik Jae Park, Sol A. Lee, Mi Gyoung Lee, Tae Hyung Lee, Hoonkee Park, Changyeon Kim, Jaemin Park, Jooho Moon, Jin Young Kim, Ho Won Jang

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

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.

Original languageEnglish
Article number120217
JournalApplied Catalysis B: Environmental
Volume293
DOIs
Publication statusPublished - 2021 Sept 15

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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