Cooperative Coupling of H2O2 Production and Organic Synthesis over a Floatable Polystyrene‐Sphere‐Supported TiO2/Bi2O3 S‐Scheme Photocatalyst. Issue 38 (22nd August 2022)

• Record Type: Journal Article
• Authors: He, Bowen; Wang, Zhongliao; Xiao, Peng; Chen, Tao; Yu, Jiaguo; Zhang, Liuyang
• Is Part Of: Advanced materials. Volume 34:Issue 38(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-22
• Subjects: photocatalytic furfuryl alcohol oxidation -- photocatalytic hydrogen peroxide production -- step‐scheme photocatalysts -- triphase systems; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202203225
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Cooperative coupling of photocatalytic H2 O2 production with organic synthesis has an expansive perspective in converting solar energy into storable chemical energy. However, traditional powder photocatalysts suffer from severe agglomeration, limited light absorption, poor gas reactant accessibility, and reusable difficulty, which greatly hinders their large‐scale application. Herein, floatable composite photocatalysts are synthesized by immobilizing hydrophobic TiO2 and Bi2 O3 on lightweight polystyrene (PS) spheres via hydrothermal and photodeposition methods. The floatable photocatalysts are not only solar transparent, but also upgrade the contact between reactants and photocatalysts. Thus, the floatable step‐scheme (S‐scheme) TiO2 /Bi2 O3 photocatalyst exhibits a drastically enhanced H2 O2 yield of 1.15 mm h −1 and decent furfuryl alcohol conversion to furoic acid synchronously. Furthermore, the S‐scheme mechanism and dynamics are systematically investigated by in situ irradiated X‐ray photoelectron spectroscopy and femtosecond transient absorption spectrum analyses. In situ Fourier transform infrared spectroscopy and density functional theory calculations reveal the mechanism of furoic acid evolution. The ingenious design of floatable photocatalysts not only furnishes insight into maximizing photocatalytic reaction kinetics but also provides a new route for highly efficient heterogeneous catalysis. Abstract : A floatable polystyrene‐sphere‐supported TiO2 /Bi2 O3 S‐scheme photocatalyst is fabricated, which exhibits a high yield of H2 O2 and furoic acid in the triphase system. Detailed spectroscopic characterizations and theoretical calculations reveal the step‐scheme mechanism and pathways of H2 O2 and furoic acid evolution, respectively. The merits of the S‐scheme and triphase system are responsible for the extraordinary photocatalytic performance.