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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
Hydrogen-Spillover-Mediated Interfacial Synergistic Catalysis Over MgAl-LDH/TiO2 for Enhanced Photocatalytic H2O2
Dawei Liu1, Tianyu Zhang1, Shihang Lu1
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China.
None:
The representative TiO2-based photocatalysts for H2O2 production remain fundamentally limited by the sluggish kinetics of proton-electron coupling transfer (PECT). Herein, a novel composite of defect-rich MgAl-LDH nanosheet-modified TiO2 (dMAL/T) has been rationally designed via a facile electrostatic self-assembly strategy. The dMAL enriched with surface hydroxyl groups promotes proton transport through hydrogen spillover, which unlocks the limitation of proton supply in the PECT step. Notably, the dMAL/T photocatalyst exhibits a high H2O2 production rate of 1.576 mmol g-1 h-1 under Xe lamp irradiation, which is about 2.5 times higher than that of bare TiO2. This work provides a novel strategy for developing efficient photocatalysts by leveraging hydrogen-spillover-mediated interfacial synergy.
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