Onion-ring-like g-C3N4 modified with Bi3TaO7 quantum dots: A novel 0D/3D S-scheme heterojunction for enhanced photocatalytic hydrogen production under visible light irradiation

Weilong Shi, Wei Sun, Yanan Liu, Xiangyu Li, Xue Lin, Feng Guo and Yuanzhi Hong

Renewable Energy, 2022, vol. 182, issue C, 958-968

Abstract: Photocatalytic H2 evolution is a clean and renewable process that converts solar energy into chemical energy through water splitting under solar light irradiation. Herein, zero-dimensional (0D) Bi3TaO7 (BTO) quantum dots/three-dimensional (3D) onion-ring-like g-C3N4 (OR-CN) S-scheme heterojunction catalyst is constructed to simulate the production of hydrogen by photocatalysis under sunlight irradiation through a solvothermal method for photocatalytic hydrogen production under visible light irradiation. Results reveal that BTO/OR-CN heterojunction exhibited much higher photocatalytic activity compared to the pure BTO and OR-CN, in which the optimal loading amount 0.3% BTO/OR-CN composite endows the optimal photocatalytic H2 evolution rate of 4891 μmol g−1 with the apparent quantum yield (AQY) at 420 nm of 4.1%. The enhancement of excellent photocatalytic H2 performance is due to the formation of S-scheme heterojunction structure between 0D BTO quantum dots and 3D OR-CN, which promotes the separation and migration of photogenerated carriers and significantly enhances the visible-light absorption capacity. This work offers a viable strategy to construct 0D/3D S-scheme heterojunction photocatalyst in the application of photocatalytic field under visible light.

Keywords: Bi3TaO7; g-C3N4; Visible light; Hydrogen; Photocatalysis; S-scheme (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:182:y:2022:i:c:p:958-968

DOI: 10.1016/j.renene.2021.11.030

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