A two-photon tandem black phosphorus quantum dot-sensitized BiVO4photoanode for solar water splitting

Bingjun Jin, Yoonjun Cho, Cheolwoo Park, Jeehun Jeong, Sungsoon Kim, Jie Jin, Wooyul Kim, Luyang Wang, Siyu Lu, Shengli Zhang, Sang Ho Oh, Kan Zhang, Jong Hyeok Park

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)


The photoelectrochemical (PEC) water splitting efficiency is profoundly restricted by the limited light harvesting, rapid charge recombination, and sluggish water oxidation kinetics, in which the construction of a photoelectrode requires a strategic approach to overcome such intrinsic hurdles. Herein, we demonstrate novel black phosphorus quantum dots (BPQDs) with significant light absorbability up to the near-infrared region (NIR) to sensitize the etched BiVO4 photoanode (E-BiVO4) for a two-photon absorption tandem photoanode. A subsequent TiO2 overlayer (OL) significantly improves the stability of the E-BiVO4/BPQDs and eliminates the surface trap state to enhance charge separation. Finally, an oxygen evolution catalyst (OEC), NiOOH, loaded on E-BiVO4/BPQDs/OL further improves the water oxidation kinetics. The rationally designed E-BiVO4/BPQDs/OL-OEC with multiple components, each with definite functions, achieves a photocurrent density of 6.2 mA cm-2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 illumination, offering a high-end standard approach for achieving efficient solar-to-fuel conversion devices by combining a photosensitizer and passivation layer.

Original languageEnglish
Pages (from-to)672-679
Number of pages8
JournalEnergy and Environmental Science
Issue number2
Publication statusPublished - 2022 Feb

Bibliographical note

Publisher Copyright:
© 2022 The Royal Society of Chemistry.

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution


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