A two-photon tandem black phosphorus quantum dot-sensitized BiVO4 photoanode for solar water splitting. Issue 2 (5th January 2022)

• Record Type: Journal Article
• Authors: Jin, Bingjun; Cho, Yoonjun; Park, Cheolwoo; Jeong, Jeehun; Kim, Sungsoon; Jin, Jie; Kim, Wooyul; Wang, Luyang; Lu, Siyu; Zhang, Shengli; Oh, Sang Ho; Zhang, Kan; Park, Jong Hyeok
• Is Part Of: Energy & environmental science. Volume 15:Issue 2(2022)
• Page Start: 672
• Page End: 679
• Publication Date: 2022-01-05
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/d1ee03014k
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : A two-photon tandem absorption E-BiVO4 /BPQDs/OL-OEC photoanode with superior light absorbability and photocurrent density. 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.