An efficient and multifunctional S-scheme heterojunction photocatalyst constructed by tungsten oxide and graphitic carbon nitride: Design and mechanism study

The design of multifunctional photocatalyst with strong redox performance is the key to achieve sustain-able utilization of solar energy. In this study, an elegant S-scheme heterojunction photocatalyst was con-structed between metal-free graphitic carbon nitride (g-C3N4) and noble-metal-free tungsten oxide (W18O49). As-established S-scheme heterojunction photocatalyst enabled multifunctional photocatalysis behavior, including hydrogen production, degradation (Rhodamine B) and bactericidal (Escherichia coli) properties, which represented extraordinary sustainability. Finite-difference time-domain (FDTD) simu-lations manifested that the integration of double-layer hollow g-C3N4 nanotubes with W18O49 nanowires could expand the light harvesting ability. Demonstrated by density functional theory (DFT) calculations and electron spin resonance (ESR) measurements, the S-scheme heterojunction not only promoted the separation of carriers, but also improved the redox ability of the catalyst. This work provides a theoretical basis for enhancing the photocatalytic performances and broadening the application field of photocatalysis.(c) 2022 Elsevier Inc. All rights reserved.

Automated summary

The study focuses on the design of a multifunctional photocatalyst with strong redox performance, constructed by a S-scheme heterojunction between metal-free g-C3N4 and noble-metal-free W18O49. The designed photocatalyst exhibits outstanding sustainability with hydrogen production, degradation, and bactericidal properties. The integration of hollow g-C3N4 nanotubes and W18O49 nanowires enhances the light harvesting ability, and the S-scheme heterojunction promotes carrier separation and redox ability of the catalyst. This work provides a theoretical basis for improving photocatalytic performance and expanding the application field of photocatalysis.