Tailored BiVO4/In2O3 nanostructures with boosted charge separation ability toward unassisted water splitting

Mi Gyoung Lee, Jin Wook Yang, Ik Jae Park, Tae Hyung Lee, Hoonkee Park, Woo Seok Cheon, Sol A. Lee, Hyungsoo Lee, Su Geun Ji, Jun Min Suh, Jooho Moon, Jin Young Kim, Ho Won Jang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numbere321
JournalCarbon Energy
Volume5
Issue number6
DOIs
Publication statusPublished - 2023 Jun

Bibliographical note

Publisher Copyright:
© 2023 The Authors. 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

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