CdS decorated resorcinol-formaldehyde spheres as an inorganic/organic S-scheme photocatalyst for enhanced H2O2 production

Photocatalytic H2O2 production provides a clean and sustainable strategy for artificial photosynthesis.Herein,an inorganic/organic composite photocatalyst was fabricated by in-situ growth of CdS nanoparti-cles on the surface of resorcinol-formaldehyde(RF)resin spheres.RF spheres played multiple roles:(ⅰ)acting as a substrate for the growth of CdS and constructing a core-shell structure with seamless con-tact;(ⅱ)improving visible light absorption of CdS;(ⅲ)forming an S-scheme heterojunction with CdS and promoting the charge separation and transfer.Consequently,under visible light illumination,CdS/RF com-posite presented remarkably enhanced H2O2 production activity.Its H2O2 yield in 60 min was 801 μmol L-1,which was 5.2 and 1.5 times higher than that of RF spheres and CdS hollow spheres,respectively.The charge migration between CdS and RF followed the S-scheme photocatalytic mechanism,which was verified by work function measurement,ex-situ and in-situ irradiated X-ray photoelectron spectroscopy.This work brings a novel insight into designing RF-based inorganic/organic S-scheme heterojunction pho-tocatalysts for efficient H2O2 production.