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

4 Citations (Scopus)

Abstract

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
Volume15
Issue number2
DOIs
Publication statusPublished - 2022 Feb

Bibliographical note

Funding Information:
This work was supported by NSFC (22172077, 21902104), the Natural Science Foundation of Jiangsu Province of China (BZ2020063), NRF Korea (NRF-2019R1A2C3010479, NRF-2019M1-A2A2065612, NRF-2019M3E6A1064525, and 2019R1A4A1029237), Jiangsu International Science and Technology Cooperation Program (BZ2020063), and the Fundamental Research Funds for the Central Universities (No. 30921011216). J. H. P. acknowledges the support by Yonsei-KIST Convergence Research Program. The authors thank Y. G. and X.F.Y who participated in the discussions for analyzing the data obtained from the calculations.

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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